Blitz Rating List — Official 1026-Game Regular Season + Completed R16 Knockout + Completed R8 Knockout + Completed Semifinals + Final Result — StockfishJRC Champion — 11/06/2026
This page is the official Blitz rating surface for the II BLITZ IJCCRL LIVE ARENA 2026 — Derived Stockfish Track regular season. The audited dataset is closed at 1026 official games after removing one duplicated Dark SisTer vs Deepalienist game that had no mirrored partner and broke the pair-ratio contract. Ratings are centred on Elo base 3700. The first 16 engines in this table qualified for the knockout phase. R16-M1 through R16-M8, including the R16-M7-TB1 tiebreak, remain preserved as the completed Round of 16 record. R8-M1 through R8-M4 also remain preserved as the completed Round of 8 record: Dark SisTer 15.3 advanced from R8-M1, SF TACTICAL 270426 advanced from R8-M2 after the completed TB1/TB2/TB3 chain, StockfishJRC advanced from R8-M3, and DarkSeid v10.7 SE advanced from R8-M4. The semifinal layer is now updated. SF-M1 is recorded as DarkSeid v10.7 SE defeating Dark SisTer 15.3 by 26.0–24.0; the detailed PGN/JSON/scheduler artefacts for that match were not retained because Node was later started with NEW_TOURNAMENT, so the public record preserves the operator-confirmed score without publishing unavailable technical metrics. SF-M2 is now audited and closed as a full technical match record: StockfishJRC-2.20-070626-sse41popcnt defeated SF TACTICAL 270426 by 26.0–24.0 after 50 games, with exact 25W/25B colour balance, 25 complete mirrored opening units, pair ratio 0 and no tiebreak requirement. The final is now audited and closed: StockfishJRC-2.20-070626-sse41popcnt defeated DarkSeid v10.7 SE by 52.0–48.0 after 100 games and is the II BLITZ IJCCRL LIVE ARENA 2026 Derived Stockfish Track champion. The final preserved exact 50W/50B colour balance for each engine, 50 complete mirrored opening units and pair ratio 0. Forensic note: games 83 and 84 were symmetric readyok-timeout proxy_fatal results inside the same mirrored A41 unit; they gave one point to each engine and did not affect the champion or the final margin.
Official Elo Ranking — Clean 1026-Game Set
The rating list is placed first because it is the authority for qualification and seeding. Stockfish 18 is consolidated under its official release identity even when the source ID appears as a development or binary-specific label; the same release/version aggregation principle is applied consistently to engine identities.
| # | Engine | Games | Score | + = – | W / B | Elo | Status |
|---|---|---|---|---|---|---|---|
| 1 | Dark SisTer_15_sse41-popcnt Official display: Dark SisTer 15 | 108 | 63.5 (58.80%) | 47 = 33 – 28 | 54 / 54 | 3759 +59 vs base | QUALIFIED |
| 2 | SF TACTICAL_270426_sse41-popcnt Official display: SF TACTICAL 270426 | 108 | 61.5 (56.94%) | 47 = 29 – 32 | 54 / 54 | 3747 +47 vs base | QUALIFIED |
| 3 | StockfishJRC-1.90-060526-sse41popcnt | 108 | 60.5 (56.02%) | 42 = 37 – 29 | 54 / 54 | 3740 +40 vs base | QUALIFIED |
| 4 | Brainlearnjrc-2.30-10052-sse41popcnt | 108 | 59.5 (55.09%) | 45 = 29 – 34 | 54 / 54 | 3734 +34 vs base | QUALIFIED |
| 5 | DarkSeid v10.7_SE_sse41 Official display: DarkSeid v10.7 SE | 108 | 59.0 (54.63%) | 43 = 32 – 33 | 54 / 54 | 3731 +31 vs base | QUALIFIED |
| 6 | Revolution-5.60-100526-sse41popcnt | 108 | 57.5 (53.24%) | 38 = 39 – 31 | 54 / 54 | 3722 +22 vs base | QUALIFIED |
| 7 | SpecTral 12_sse41 | 108 | 57.0 (52.78%) | 39 = 36 – 33 | 54 / 54 | 3719 +19 vs base | QUALIFIED |
| 8 | Artemis 28.2TR_PrO_sse41 | 108 | 56.5 (52.31%) | 38 = 37 – 33 | 54 / 54 | 3716 +16 vs base | QUALIFIED |
| 9 | Killfish PB 010426_sse41_popcnt Official display: Killfish PB 010426 | 108 | 56.0 (51.85%) | 37 = 38 – 33 | 54 / 54 | 3712 +12 vs base | QUALIFIED |
| 10 | Hlamnick 070426_sse41 Official display: Hlamnick 070426 | 108 | 55.5 (51.39%) | 38 = 35 – 35 | 54 / 54 | 3709 +9 vs base | QUALIFIED |
| 11 | Brainlearn31-x86-64-sse41-popcnt | 108 | 54.0 (50.00%) | 32 = 44 – 32 | 54 / 54 | 3700 +0 vs base | QUALIFIED |
| 12 | HypnoS 120126-sse41-popcnt Official display: HypnoS 120126 | 108 | 53.0 (49.07%) | 38 = 30 – 40 | 54 / 54 | 3694 -6 vs base | QUALIFIED |
| 13 | stockfish-windows-x86-64-sse41-popcnt Official display: Stockfish 18 | 108 | 52.0 (48.15%) | 36 = 32 – 40 | 54 / 54 | 3688 -12 vs base | QUALIFIED |
| 14 | corchess_x64 Official display: CorChess 5 dev-20260227-3d8f4977 | 108 | 51.0 (47.22%) | 36 = 30 – 42 | 54 / 54 | 3682 -18 vs base | QUALIFIED |
| 15 | RapTora 6.0_ssse3 Official display: RapTora 6 | 108 | 49.5 (45.83%) | 29 = 41 – 38 | 54 / 54 | 3672 -28 vs base | QUALIFIED |
| 16 | Deepalienist-4.40-100526-sse41popcnt | 108 | 49.0 (45.37%) | 31 = 36 – 41 | 54 / 54 | 3669 -31 vs base | QUALIFIED |
| 17 | Cortex ZKT 11.11 SSE41 Official display: Cortex ZKT 11.11 | 108 | 46.5 (43.06%) | 26 = 41 – 41 | 54 / 54 | 3654 -46 vs base | RESERVE |
| 18 | DON-windows-x86-64-sse41-popcnt | 108 | 45.5 (42.13%) | 24 = 43 – 41 | 54 / 54 | 3647 -53 vs base | RESERVE |
| 19 | Wordfish-4.80-040526-sse41popcnt | 108 | 39.0 (36.11%) | 15 = 48 – 45 | 54 / 54 | 3605 -95 vs base | RESERVE |
Round of 16 Results — Completed R16 Bracket
Pairings were configured directly from the official seed order: #1 vs #16, #2 vs #15, #3 vs #14, #4 vs #13, #5 vs #12, #6 vs #11, #7 vs #10 and #8 vs #9. Engines ranked 17–19 remained outside the initial 16-engine knockout bracket. R16-M7 required TB1 after a 25.0–25.0 main-match tie; SpecTral 15.3 won TB1 by 1.5–0.5 and is now certified as the R16-M7 qualifier.
| Match | Higher seed | Lower seed | Status | |
|---|---|---|---|---|
| R16-M1 | #1 Dark SisTer 15.3 Regular-season seed authority: Dark SisTer_15_sse41-popcnt • Elo 3759 • 63.5/108 M16 release used: Dark SisTer 15.3-universal | 25.5–24.5 | #16 Deepalienist-4.70-190526-sse41popcnt Regular-season seed authority: Deepalienist-4.40-100526-sse41popcnt • Elo 3669 • 49.0/108 M16 release used: Deepalienist-4.70-190526-sse41popcnt | Dark SisTer advances |
| R16-M2 | #2 SF TACTICAL 270426 SF TACTICAL_270426_sse41-popcnt • Elo 3747 • 61.5/108 M16 release used: SF TACTICAL_270426_sse41-popcnt | 25.5–24.5 | #15 RapTora 6 RapTora 6.0_ssse3 • Elo 3672 • 49.5/108 M16 release used: RapTora 6.0_ssse3 | SF TACTICAL advances |
| R16-M3 | #3 StockfishJRC-2.10-180526-sse41popcnt Regular-season seed authority: StockfishJRC-1.90-060526-sse41popcnt • Elo 3740 • 60.5/108 M16 release used: StockfishJRC-2.10-180526-sse41popcnt | 27.0–23.0 | #14 CorChess 5 dev-20260227-3d8f4977 corchess_x64 • Elo 3682 • 51.0/108 M16 release used: CorChess 5 dev-20260227-3d8f4977 | StockfishJRC advances |
| R16-M4 | #4 Brainlearnjrc-2.60-200526-sse41popcnt Regular-season seed authority: Brainlearnjrc-2.30-10052-sse41popcnt • Elo 3734 • 59.5/108 M16 release used: Brainlearnjrc-2.60-200526-sse41popcnt | 24.0–26.0 | #13 Stockfish 18 stockfish-windows-x86-64-sse41-popcnt • Elo 3688 • 52.0/108 M16 release used: stockfish-windows-x86-64-sse41-popcnt | Stockfish 18 advances |
| R16-M5 | #5 DarkSeid v10.7 SE DarkSeid v10.7_SE_sse41 • Elo 3731 • 59.0/108 M16 release used: DarkSeid v10.7_SE_sse41 | 27.0–23.0 | #12 HypnoS 120126 HypnoS 120126-sse41-popcnt • Elo 3694 • 53.0/108 M16 release used: HypnoS 120126-sse41-popcnt | DarkSeid advances |
| R16-M6 | #6 Revolution-5.60-100526-sse41popcnt Revolution-5.60-100526-sse41popcnt • Elo 3722 • 57.5/108 R16-M6 result: 26.0/50 | 26.0–24.0 | #11 Brainlearn 31 Brainlearn31-x86-64-sse41-popcnt • Elo 3700 • 54.0/108 R16-M6 result: 24.0/50 | Revolution advances |
| R16-M7 | #7 SpecTral 15.3 Regular-season seed authority: SpecTral 12_sse41 • Elo 3719 • 57.0/108 M16 release used: SpecTral_15.3-universal R16-M7 result: 25.0/50 TB1 result: 1.5/2 • advances | 25.0–25.0 TB1: 1.5–0.5 | #10 Hlamnick 070426 Hlamnick 070426_sse41 • Elo 3709 • 55.5/108 M16 release used: Hlamnick 070426_sse41 R16-M7 result: 25.0/50 TB1 result: 0.5/2 • eliminated | SpecTral advances after TB1 |
| R16-M8 | #8 Artemis 28.2TR_PrO_sse41 Artemis 28.2TR_PrO_sse41 • Elo 3716 • 56.5/108 R16-M8 result: 23.5/50 | 23.5–26.5 | #9 Killfish PB 010426 Killfish PB 010426_sse41_popcnt • Elo 3712 • 56.0/108 R16-M8 result: 26.5/50 | Killfish advances |
Round of 8 Results and Semifinal Pairings
The Round of 8 bracket remains fully closed after audit. R8-M1 was won by Dark SisTer 15.3 over Killfish PB 010426 by 27.0–23.0. R8-M2 was resolved after a 25.0–25.0 main-match tie and a completed tiebreak chain, with SF TACTICAL 270426 advancing by the official tiebreak aggregate 3.5–2.5. R8-M3 is closed as a one-point win for StockfishJRC-2.10-180526-sse41popcnt over Revolution-5.80-030625-sse41popcnt by 25.5–24.5. R8-M4 is closed as a 26.0–24.0 win for DarkSeid v10.7 SE over Stockfish 18. The semifinal layer has now also been resolved: DarkSeid v10.7 SE defeated Dark SisTer 15.3 by 26.0–24.0 in SF-M1, and StockfishJRC-2.20-070626-sse41popcnt defeated SF TACTICAL 270426 by 26.0–24.0 in SF-M2. The final layer is now closed as StockfishJRC-2.20-070626-sse41popcnt 52.0–48.0 DarkSeid v10.7 SE.
| Match | Qualified engine A | Qualified engine B | Status | |
|---|---|---|---|---|
| R8-M1 | R16-M1 winner Dark SisTer 15.3 Qualified by defeating Deepalienist-4.70-190526 by 25.5–24.5. R8-M1 result: 27.0/50 • advances. | 27.0–23.0 | R16-M8 winner Killfish PB 010426 Qualified by defeating Artemis 28.2TR_PrO by 26.5–23.5. R8-M1 result: 23.0/50 • eliminated. | Dark SisTer advances |
| R8-M2 | R16-M2 winner SF TACTICAL 270426 Qualified by defeating RapTora 6 by 25.5–24.5. Main match: 25.0/50. Tiebreak aggregate: 3.5/6 • advances. | 25.0–25.0 TB: 3.5–2.5 | R16-M7 winner after TB1 SpecTral 15.3 Main match 25.0–25.0 vs Hlamnick; TB1 won 1.5–0.5. Main match: 25.0/50. Tiebreak aggregate: 2.5/6 • eliminated. | SF TACTICAL advances after TB3 |
| R8-M3 | R16-M3 winner StockfishJRC-2.10-180526-sse41popcnt Qualified by defeating CorChess 5 dev-20260227-3d8f4977 by 27.0–23.0. R8-M3 result: 25.5/50 • advances. | 25.5–24.5 | R16-M6 winner Revolution-5.80-030625-sse41popcnt R16 qualifier was Revolution-5.60-100526; R8 engine release updated to Revolution-5.80-030625. R8-M3 result: 24.5/50 • eliminated. | StockfishJRC advances |
| R8-M4 | R16-M4 winner Stockfish 18 Qualified by defeating Brainlearnjrc-2.60-200526 by 26.0–24.0. R8-M4 result: 24.0/50 • eliminated. | 24.0–26.0 | R16-M5 winner DarkSeid v10.7 SE Qualified by defeating HypnoS 120126 by 27.0–23.0. R8-M4 result: 26.0/50 • advances. | DarkSeid advances |
Semifinal Results — Final Pairing Set
The semifinal bracket is now resolved. SF-M1 is recorded as a 26.0–24.0 win for DarkSeid v10.7 SE over Dark SisTer 15.3. Because the SF-M1 artefacts were overwritten after starting Node with NEW_TOURNAMENT, only the operator-confirmed score is published here; unavailable PGN/JSON/scheduler-derived metrics are not reconstructed. SF-M2 is fully audited from the retained match package: StockfishJRC-2.20-070626-sse41popcnt defeated SF TACTICAL 270426 by 26.0–24.0 with exact colour balance, complete mirrored opening units and pair ratio 0.
| Match | Semifinal engine A | Semifinal engine B | Status | |
|---|---|---|---|---|
| SF-M1 | #1 semifinal qualifier Dark SisTer 15.3 Qualified from R8-M1 by defeating Killfish PB 010426 by 27.0–23.0. SF-M1 restored record: 24.0/50 • eliminated. | 24.0–26.0 | #4 semifinal qualifier DarkSeid v10.7 SE Qualified from R8-M4 by defeating Stockfish 18 by 26.0–24.0. SF-M1 restored record: 26.0/50 • advances. | DarkSeid advances |
| SF-M2 | #2 semifinal qualifier SF TACTICAL 270426 Qualified from R8-M2 after the completed TB3 chain against SpecTral 15.3. SF-M2 audited result: 24.0/50 • eliminated. | 24.0–26.0 | #3 semifinal qualifier StockfishJRC-2.20-070626-sse41popcnt R8 qualifier authority: StockfishJRC-2.10-180526-sse41popcnt; SF-M2 release updated to StockfishJRC-2.20-070626. SF-M2 audited result: 26.0/50 • advances. | StockfishJRC advances |
Final Official Result — StockfishJRC-2.20-070626 Champion
The final is closed after audit. StockfishJRC-2.20-070626-sse41popcnt defeated DarkSeid v10.7 SE by 52.0–48.0 after 100 games and is certified as the II BLITZ IJCCRL LIVE ARENA 2026 — Derived Stockfish Track champion. The final preserved 50 White and 50 Black games for each engine, 50 complete mirrored opening units, pair ratio 0 and scheduler pending null at closure.
| Engine | Score | Games | + = – | W / B | White score | Black score |
|---|---|---|---|---|---|---|
StockfishJRC-2.20-070626-sse41popcnt Final champion. Qualified from SF-M2 after defeating SF TACTICAL 270426 by 26.0–24.0. | 52.0 | 100 | 25 = 54 – 21 | 50 / 50 | 36.5/50 | 15.5/50 |
DarkSeid v10.7 SE Final runner-up. Qualified from SF-M1 after defeating Dark SisTer 15.3 by 26.0–24.0. | 48.0 | 100 | 21 = 54 – 25 | 50 / 50 | 34.5/50 | 13.5/50 |
Final audit controls
- PGN games: 100.
- JSON games: 100.
- Scheduler closure: openingIndex 100, cycleSetNo 51, pending null.
- Colour balance: 50 White and 50 Black for each engine.
- Mirrored units: 50/50 closed.
- Pair ratio: 0.
- Opening policy: same opening line for both colours inside each mirrored unit; opening changes after the two games of the unit.
- Winner: StockfishJRC-2.20-070626-sse41popcnt.
- Tiebreak requirement: none; the final did not finish tied.
Final technical profile
- Result profile: 44 White wins, 2 Black wins and 54 draws.
- Terminations: 43 checkmates, 31 threefold repetitions, 14 insufficient-material draws, 8 fifty-move-rule draws, 2 proxy_fatal readyok-timeout results, 1 normal flag/time result and 1 stalemate.
- Mirrored-unit profile: StockfishJRC won 8 units, DarkSeid won 4 units and 38 units were drawn.
- Total plies: 15,868; mean length: 158.68 plies.
- TBHitsTotal aggregate: 38,587,658.
- TBHits by engine: DarkSeid 21,396,463; StockfishJRC 17,191,195.
- TB reporting: both engines reported TB data in 98/100 games; the two zero-hit games are the disclosed proxy_fatal games 83 and 84.
Final Forensic Note — Games 83 and 84
Games 83 and 84 are disclosed as symmetric proxy_fatal readyok-timeout results inside the same mirrored A41 opening unit. Game 83 was recorded as DarkSeid 0–1 StockfishJRC after a White-engine readyok timeout; game 84 was recorded as StockfishJRC 0–1 DarkSeid after the corresponding White-engine readyok timeout. The two technical results cancel each other competitively, add one point to each finalist and do not affect the winner, the final margin, the colour balance or the pair-ratio contract. If both games are excluded for a conservative chess-only review, the score remains StockfishJRC 51.0–47.0 DarkSeid across 98 valid games, so StockfishJRC remains champion.
Final Knockout Closure
StockfishJRC-2.20-070626-sse41popcnt is certified as the Derived Stockfish Track champion after defeating DarkSeid v10.7 SE by 52.0–48.0 in the 100-game final. The final is accepted for publication because it closes with exactly 100 games, 50 complete mirrored opening units, exact 50W/50B distribution for both engines, pair ratio 0 and scheduler pending null. The disclosed readyok-timeout pair in games 83–84 is retained as a forensic note rather than removed from the official score because it is symmetrical inside one mirrored unit and does not affect the champion.
SF-M2 Official Result — StockfishJRC-2.20-070626 Advances
SF-M2 is closed after audit. StockfishJRC-2.20-070626-sse41popcnt defeated SF TACTICAL 270426 by 26.0–24.0 after 50 games and advances to the final. The match does not require a tiebreak.
| Engine | Score | Games | + = – | W / B | White score | Black score |
|---|---|---|---|---|---|---|
StockfishJRC-2.20-070626-sse41popcnt SF-M2 engine ID: StockfishJRC-2.20-070626-sse41popcnt | 26.0 | 50 | 11 = 30 – 9 | 25 / 25 | 18.0/25 | 8.0/25 |
SF TACTICAL 270426 SF-M2 engine ID: SF TACTICAL_270426_sse41-popcnt | 24.0 | 50 | 9 = 30 – 11 | 25 / 25 | 17.0/25 | 7.0/25 |
SF-M2 audit controls
- PGN games: 50.
- JSON games: 50.
- Scheduler/result parity: 50 completed games for both engines.
- Colour balance: 25 White and 25 Black for each engine.
- Mirrored units: 25/25 closed.
- Pair ratio: 0.
- Opening lines: Annotator #1 through #25, each used exactly twice as a mirrored pair.
- PGN/JSON parity: no mismatch detected in result, colour or opening block.
- Critical incidents: no invalid extra game, no orphan mirrored unit and no tiebreak requirement.
SF-M2 technical profile
- Result profile: 20 White wins, 30 draws and 0 Black wins.
- Terminations: 20 checkmates, 18 threefold repetitions, 10 insufficient-material draws, 1 fifty-move-rule draw and 1 stalemate.
- Mirrored-unit profile: StockfishJRC won 4 units, SF TACTICAL won 2 units, and 19 units were drawn.
- Decisive unit balance: StockfishJRC +2 net units, matching the final 26.0–24.0 margin.
- Total plies: 7,819; mean length: 156.38 plies.
- TBHitsTotal aggregate: 21,047,598.
- TBHits by engine: StockfishJRC 10,978,632; SF TACTICAL 10,068,966.
SF-M2 Knockout Closure
StockfishJRC-2.20-070626-sse41popcnt advances from SF-M2 after defeating SF TACTICAL 270426 by 26.0–24.0. The match is accepted as an official semifinal result because it closes exactly at 50 games, 25 mirrored opening units, 25 White and 25 Black games for each engine and pair ratio 0. SF-M2 does not require a tiebreak.
SF-M1 Restored Result — DarkSeid v10.7 SE Advances
SF-M1 is recorded as a 26.0–24.0 win for DarkSeid v10.7 SE over Dark SisTer 15.3. The detailed match artefacts were lost after starting Node with NEW_TOURNAMENT before preserving the output, so this page publishes the score and bracket consequence without inventing unavailable audit metrics.
| Engine | Score | Games | Record status |
|---|---|---|---|
DarkSeid v10.7 SE SF-M1 semifinal winner. | 26.0 | 50 | Advances to final Operator-confirmed result; detailed PGN/JSON metrics unavailable. |
Dark SisTer 15.3 Qualified from R8-M1; eliminated in SF-M1. | 24.0 | 50 | Eliminated Operator-confirmed result; detailed PGN/JSON metrics unavailable. |
SF-M1 Record Note
SF-M1 is intentionally recorded as a restored result rather than a full technical audit block. The official score is DarkSeid v10.7 SE 26.0–24.0 Dark SisTer 15.3, which advances DarkSeid to the final. Because the underlying output was overwritten by starting Node with NEW_TOURNAMENT, this page does not publish reconstructed values for + = -, White/Black scores, terminations, TB hits, scheduler fields or PGN/JSON parity.
R8 Match Contract
Each R8 main match must run as a fixed 50-game two-engine match: 25 complete mirrored opening units, 25 White and 25 Black games per engine, pair ratio 0 and scheduler pending null at closure. R8-M1 satisfies this contract and is closed as an official 27.0–23.0 win for Dark SisTer 15.3 over Killfish PB 010426. R8-M2 also satisfies this contract and is closed as an official main-match tie: SF TACTICAL 270426 25.0–25.0 SpecTral 15.3, later resolved by the completed TB1/TB2/TB3 tiebreak chain for SF TACTICAL 270426. R8-M3 satisfies this contract and is closed as an official 25.5–24.5 win for StockfishJRC-2.10-180526-sse41popcnt over Revolution-5.80-030625-sse41popcnt. R8-M4 satisfies this contract and is closed as an official 26.0–24.0 win for DarkSeid v10.7 SE over Stockfish 18. With R8-M4 closed, all Round of 8 advancement slots were resolved; the semifinal layer is now also closed and the final pairing is set.
R8-M4 Official Result — DarkSeid v10.7 SE Advances
R8-M4 is closed after audit. The regular-season Elo table above remains unchanged and continues to be the seed authority; this block records only the Round of 8 knockout result. DarkSeid v10.7 SE defeated Stockfish 18 by 26.0–24.0 and advances to the semifinal bracket.
| Engine | Score | Games | + = – | W / B | White score | Black score |
|---|---|---|---|---|---|---|
DarkSeid v10.7 SE R8 engine ID: DarkSeid v10.7_SE_sse41 | 26.0 | 50 | 13 = 26 – 11 | 25 / 25 | 19.0/25 | 7.0/25 |
Stockfish 18 R8 engine ID: stockfish-windows-x86-64-sse41-popcnt | 24.0 | 50 | 11 = 26 – 13 | 25 / 25 | 18.0/25 | 6.0/25 |
R8-M4 audit controls
- PGN games: 50.
- JSON games: 50.
- Scheduler closure: openingIndex 50, cycleSetNo 26, pending null.
- Colour balance: 25 White and 25 Black for each engine.
- Mirrored units: 25/25 closed.
- Pair ratio: 0.
- PGN/JSON/scheduler parity: no discrepancy detected.
- Critical incidents: 0 proxy_fatal, 0 illegal_move, 0 no_bestmove, 0 crash/forfeit.
- Tiebreak requirement: none; the match did not finish tied.
R8-M4 technical profile
- Result profile: 24 White wins, 26 draws and 0 Black wins.
- Terminations: 24 checkmates, 17 threefold repetitions, 7 insufficient-material draws and 2 fifty-move-rule draws.
- Mirrored-unit profile: DarkSeid won 5 units, Stockfish 18 won 3 units, and 17 units were drawn.
- TB reporting: both engines reported TB data in 50/50 games.
- TBHitsTotal aggregate: 17,359,512.
- Games with zero TB hits: 0.
R8-M4 Knockout Closure
DarkSeid v10.7 SE advances from R8-M4 after defeating Stockfish 18 by 26.0–24.0. The match is accepted as an official Round of 8 knockout result because it closes exactly at 50 games, 25 mirrored opening units, 25W/25B per engine, pair ratio 0 and no scheduler pending state. R8-M4 does not require a tiebreak.
R8-M3 Official Result — StockfishJRC-2.10-180526 Advances
R8-M3 is closed after audit. The regular-season Elo table above remains unchanged and continues to be the seed authority; this block records only the Round of 8 knockout result played with the current R8 release identities. StockfishJRC-2.10-180526-sse41popcnt defeated Revolution-5.80-030625-sse41popcnt by 25.5–24.5 and advances to the semifinal bracket.
| Engine | Score | Games | + = – | W / B | Audit status |
|---|---|---|---|---|---|
StockfishJRC-2.10-180526-sse41popcnt R8 engine ID: StockfishJRC-2.10-180526-sse41popcnt | 25.5 | 50 | 12 = 27 – 11 | 25 / 25 | Advances |
Revolution-5.80-030625-sse41popcnt R8 engine release updated from the R16 qualifier identity to Revolution-5.80-030625. | 24.5 | 50 | 11 = 27 – 12 | 25 / 25 | Eliminated |
R8-M3 audit controls
- PGN games: 50.
- JSON games: 50.
- Colour balance: 25 White and 25 Black for each engine.
- Mirrored units: 25/25 closed.
- Pair ratio: 0.
- Opening source: IJCCRL-SUITE-2026.
- Syzygy: TB 1–6 enabled and reported.
- Critical incidents: 0 crash, 0 abnormal timeout, 0 disconnect and 0 administrative result.
- Tiebreak requirement: none; the match did not finish tied.
R8-M3 technical profile
- Final score: StockfishJRC-2.10-180526-sse41popcnt 25.5/50; Revolution-5.80-030625-sse41popcnt 24.5/50.
- Result profile: StockfishJRC 12 wins, 27 draws and 11 losses.
- Termination audit: 23 checkmates, 12 threefold repetitions, 8 insufficient-material draws, 6 fifty-move-rule draws and 1 stalemate.
- Competitive note: the match was decided by the minimum practical margin, 25.5–24.5.
- Scheduler closure: no pending game left after game 50.
R8-M3 Knockout Closure
StockfishJRC-2.10-180526-sse41popcnt advances from R8-M3 after defeating Revolution-5.80-030625-sse41popcnt by 25.5–24.5. The match is accepted as an official Round of 8 knockout result because it closes at 50 games with 25 mirrored opening units, 25 White and 25 Black games for each engine and pair ratio 0. R8-M3 does not require a tiebreak.
R8-M2 Official Result — Main Match Tie Resolved by TB3
R8-M2 is closed after audit as a valid 50-game main-match tie and a completed tiebreak chain. The regular-season Elo table above remains unchanged and continues to be the seed authority; this block records only the Round of 8 knockout result played with the current R8 release identities. The 25.0–25.0 main-match tie required tiebreak play: TB1 finished 1.0–1.0, TB2 finished 1.0–1.0 and TB3 decided the qualifier by 1.5–0.5 for SF TACTICAL 270426.
| Engine | Score | Games | + = – | W / B | White score | Black score |
|---|---|---|---|---|---|---|
SF TACTICAL 270426 R8 engine ID: SF TACTICAL_270426_sse41-popcnt | 25.0 | 50 | 10 = 30 – 10 | 25 / 25 | 17.5/25 | 7.5/25 |
SpecTral 15.3 R8 engine ID: SpecTral_15.3-universal | 25.0 | 50 | 10 = 30 – 10 | 25 / 25 | 17.5/25 | 7.5/25 |
R8-M2 Tiebreak Chain — SF TACTICAL 270426 Advances
R8-M2 required tiebreaks after the 25.0–25.0 main match. TB1 and TB2 were both valid mirrored draws. TB3, played at the lower 3+2 control and next opening line, produced the decisive 1.5–0.5 result for SF TACTICAL 270426.
| Stage | Control | Opening block | Opening line | SF TACTICAL | SpecTral | Status |
|---|---|---|---|---|---|---|
| TB1 | 5+2 300+2 | A11 | IJCCRL-SUITE/UHO #1 | 1.0/2 | 1.0/2 | Draw — TB2 required |
| TB2 | 5+2 300+2 | A09 | R8-M2-TB2 opening line 27 | 1.0/2 | 1.0/2 | Draw — TB3 required |
| TB3 | 3+2 180+2 | A28 | R8-M2-TB3 opening line 28 | 1.5/2 | 0.5/2 | SF TACTICAL advances |
| Engine | TB score | TB games | + = – | W / B | White score | Black score |
|---|---|---|---|---|---|---|
SF TACTICAL 270426 R8-M2 tiebreak winner after TB3 | 3.5 | 6 | 2 = 3 – 1 | 3 / 3 | 2.5/3 | 1.0/3 |
SpecTral 15.3 Eliminated after the completed tiebreak chain | 2.5 | 6 | 1 = 3 – 2 | 3 / 3 | 2.0/3 | 0.5/3 |
R8-M2 tiebreak audit controls
- TB games: 6 PGN games and 6 JSON games across TB1, TB2 and TB3.
- TB stages: 3 complete mirrored units.
- Colour balance: 3 White and 3 Black games for each engine across the tiebreak chain.
- Pair ratio: 0 in every tiebreak stage and 0 across the aggregate chain.
- Scheduler closure: pending null in TB1, TB2 and TB3.
- TB1: 5+2, A11, 1.0–1.0.
- TB2: 5+2, A09, opening line 27, 1.0–1.0.
- TB3: 3+2, A28, opening line 28, 1.5–0.5 for SF TACTICAL 270426.
- Critical incidents: 0 proxy_fatal, 0 illegal_move, 0 no_bestmove, 0 crash/forfeit.
R8-M2 tiebreak technical profile
- TB aggregate result: SF TACTICAL 270426 3.5–2.5 SpecTral 15.3.
- Game-result profile: 3 decisive games and 3 draws.
- Terminations: 3 checkmates, 2 threefold repetitions and 1 insufficient-material draw.
- TB1 games: two threefold-repetition draws.
- TB2 games: one SF TACTICAL White win by checkmate and one SpecTral White win by checkmate.
- TB3 games: SF TACTICAL White win by checkmate, then SpecTral White draw by insufficient material.
- TBHitsTotal aggregate: 7,069,774.
- Games with zero TB hits: 0.
R8-M2 main-match audit controls
- PGN games: 50.
- JSON games: 50.
- Scheduler closure: openingIndex 50, cycleSetNo 26, pending null.
- Colour balance: 25 White and 25 Black for each engine.
- Mirrored units: 25/25 closed.
- Pair ratio: 0.
- PGN/JSON/scheduler parity: no discrepancy detected.
- Critical incidents: 0 proxy_fatal, 0 illegal_move, 0 no_bestmove, 0 crash/forfeit.
- Tiebreak requirement: fulfilled by TB1, TB2 and TB3; SF TACTICAL 270426 advances after TB3.
R8-M2 main-match technical profile
- Result profile: 20 White wins, 30 draws and 0 Black wins.
- Terminations: 20 checkmates, 13 threefold repetitions, 9 insufficient-material draws, 7 fifty-move-rule draws and 1 stalemate.
- Mirrored-unit profile: SF TACTICAL won 3 units, SpecTral won 3 units, and 19 units were drawn.
- TB reporting: both engines reported TB data in 50/50 games.
- TBHitsTotal aggregate: 23,116,082.
- Games with zero TB hits: 0.
R8-M2 Knockout Closure
R8-M2 closes as an official audited main-match tie resolved by a completed tiebreak chain. SF TACTICAL 270426 and SpecTral 15.3 finished the 50-game main match at 25.0–25.0. The main match used the current R8 engine identities while preserving the regular-season seed authority from the official 1026-game Elo table and is accepted because it closes exactly at 50 games, 25 mirrored opening units, 25W/25B per engine, pair ratio 0 and no scheduler pending state. The tiebreak chain is also accepted: TB1 ended 1.0–1.0 at 5+2, TB2 ended 1.0–1.0 at 5+2, and TB3 ended 1.5–0.5 at 3+2 for SF TACTICAL 270426. Each tiebreak stage closed as a two-game mirrored unit with equal colours, pair ratio 0 and scheduler pending null. SF TACTICAL 270426 is certified as the R8-M2 qualifier; SpecTral 15.3 is eliminated.
R8-M1 Official Result — Dark SisTer 15.3 Advances
R8-M1 is closed after audit. The regular-season Elo table above remains unchanged and continues to be the seed authority; this block records only the Round of 8 knockout result played with the current R8 release identities.
| Engine | Score | Games | + = – | W / B | White score | Black score |
|---|---|---|---|---|---|---|
Dark SisTer 15.3 R8 engine ID: Dark SisTer 15.3-universal | 27.0 | 50 | 15 = 24 – 11 | 25 / 25 | 20.0/25 | 7.0/25 |
Killfish PB 010426 R8 engine ID: Killfish PB 010426_sse41_popcnt | 23.0 | 50 | 11 = 24 – 15 | 25 / 25 | 18.0/25 | 5.0/25 |
R8-M1 audit controls
- PGN games: 50.
- JSON games: 50.
- Scheduler closure: openingIndex 50, cycleSetNo 26, pending null.
- Colour balance: 25 White and 25 Black for each engine.
- Mirrored units: 25/25 closed.
- Pair ratio: 0.
- PGN/JSON/scheduler parity: no discrepancy detected.
- Critical incidents: 0 proxy_fatal, 0 illegal_move, 0 no_bestmove, 0 crash/forfeit.
- Tiebreak requirement: none; the match did not finish tied.
R8-M1 technical profile
- Result profile: 26 White wins, 24 draws and 0 Black wins.
- Terminations: 26 checkmates, 15 threefold repetitions, 7 insufficient-material draws, 1 stalemate and 1 fifty-move-rule draw.
- Mirrored-unit profile: Dark SisTer won 4 units, Killfish won 0 units, and 21 units were drawn.
- TB reporting: both engines reported TB data in 50/50 games.
- TBHitsTotal aggregate: 25,978,314.
- Games with zero TB hits: 0.
R8-M1 Knockout Closure
Dark SisTer 15.3 advances from R8-M1 after defeating Killfish PB 010426 by 27.0–23.0. The match used the current R8 engine identities while preserving the regular-season seed authority from the official 1026-game Elo table. The match is accepted as an official Round of 8 knockout result because it closes exactly at 50 games, 25 mirrored opening units, 25W/25B per engine, pair ratio 0 and no scheduler pending state. R8-M1 does not require a tiebreak.
R16-M1 Official Result — Dark SisTer 15.3 Advances
R16-M1 is closed after audit. The regular-season Elo table above remains unchanged and continues to be the seed authority; this block records only the knockout result played with the current M16 releases.
| Engine | Score | Games | + = – | W / B | White score | Black score |
|---|---|---|---|---|---|---|
Dark SisTer 15.3 M16 engine ID: Dark SisTer 15.3-universal | 25.5 | 50 | 22 = 7 – 21 | 25 / 25 | 23.5/25 | 2.0/25 |
Deepalienist-4.70-190526-sse41popcnt M16 engine ID: Deepalienist-4.70-190526-sse41popcnt | 24.5 | 50 | 21 = 7 – 22 | 25 / 25 | 23.0/25 | 1.5/25 |
R16-M1 audit controls
- PGN games: 50.
- JSON games: 50.
- Scheduler closure: openingIndex 50, pending null.
- Colour balance: 25 White and 25 Black for each engine.
- Mirrored units: 25/25 closed.
- Pair ratio: 0.
- PGN/JSON parity: no discrepancy detected.
- Critical incidents: 0 proxy_fatal, 0 illegal_move, 0 no_bestmove, 0 crash/forfeit.
R16-M1 technical profile
- Result profile: 43 White wins, 7 draws, 0 Black wins.
- Terminations: 43 checkmates, 3 threefold repetitions, 3 insufficient-material draws, 1 fifty-move-rule draw.
- Mirrored-unit profile: Dark SisTer won 3 units, Deepalienist won 2 units, 20 units were drawn.
- TB reporting: both engines reported TB data in 50/50 games.
- TBHitsTotal aggregate: 27,627,020.
- Games with zero TB hits: 0.
R16-M1 Knockout Closure
Dark SisTer 15.3 advances from R16-M1 after defeating Deepalienist-4.70-190526-sse41popcnt by 25.5–24.5. The match used the M16 current releases while preserving the regular-season seed authority from the official 1026-game Elo table. The match is accepted as an official knockout result because it closes exactly at 50 games, 25 mirrored opening units, 25W/25B per engine and pair ratio 0.
R16-M2 Official Result — SF TACTICAL 270426 Advances
R16-M2 is closed after audit. The regular-season Elo table above remains unchanged and continues to be the seed authority; this block records only the knockout result played with the current M16 releases.
| Engine | Score | Games | + = – | W / B | White score | Black score |
|---|---|---|---|---|---|---|
SF TACTICAL 270426 M16 engine ID: SF TACTICAL_270426_sse41-popcnt | 25.5 | 50 | 21 = 9 – 20 | 25 / 25 | 23.0/25 | 2.5/25 |
RapTora 6 M16 engine ID: RapTora 6.0_ssse3 | 24.5 | 50 | 20 = 9 – 21 | 25 / 25 | 22.5/25 | 2.0/25 |
R16-M2 audit controls
- PGN games: 50.
- JSON games: 50.
- Scheduler closure: openingIndex 50, pending null.
- Colour balance: 25 White and 25 Black for each engine.
- Mirrored units: 25/25 closed.
- Pair ratio: 0.
- PGN/JSON parity: no discrepancy detected.
- Critical incidents: 0 proxy_fatal, 0 illegal_move, 0 no_bestmove, 0 crash/forfeit.
R16-M2 technical profile
- Result profile: 41 White wins, 9 draws, 0 Black wins.
- Terminations: 41 checkmates, 5 insufficient-material draws and 4 threefold repetitions.
- Mirrored-unit profile: SF TACTICAL won 5 units, RapTora won 4 units, 16 units were drawn.
- TB reporting: both engines reported TB data in 50/50 games.
- TBHitsTotal aggregate: 29,915,905.
- Games with zero TB hits: 0.
R16-M2 Knockout Closure
SF TACTICAL 270426 advances from R16-M2 after defeating RapTora 6 by 25.5–24.5. The match used the current M16 engine identifiers while preserving the regular-season seed authority from the official 1026-game Elo table. The match is accepted as an official knockout result because it closes exactly at 50 games, 25 mirrored opening units, 25W/25B per engine and pair ratio 0.
R16-M3 Official Result — StockfishJRC-2.10-180526 Advances
R16-M3 is closed after audit. The regular-season Elo table above remains unchanged and continues to be the seed authority; this block records only the knockout result played with the current M16 release identity for StockfishJRC.
| Engine | Score | Games | + = – | W / B | White score | Black score |
|---|---|---|---|---|---|---|
StockfishJRC-2.10-180526-sse41popcnt Regular-season seed authority: StockfishJRC-1.90-060526-sse41popcnt M16 engine ID: StockfishJRC-2.10-180526-sse41popcnt | 27.0 | 50 | 24 = 6 – 20 | 25 / 25 | 24.0/25 | 3.0/25 |
CorChess 5 dev-20260227-3d8f4977 M16 engine ID: corchess_x64 | 23.0 | 50 | 20 = 6 – 24 | 25 / 25 | 22.0/25 | 1.0/25 |
R16-M3 audit controls
- PGN games: 50.
- JSON games: 50.
- Scheduler closure: openingIndex 50, pending null.
- Colour balance: 25 White and 25 Black for each engine.
- Mirrored units: 25/25 closed.
- Pair ratio: 0.
- PGN/JSON parity: no discrepancy detected.
- Critical incidents: 1 proxy_fatal readyok timeout in game 26; 0 illegal_move, 0 no_bestmove, 0 crash/forfeit outside that disclosed proxy incident.
R16-M3 technical profile
- Result profile: 43 White wins, 6 draws and 1 Black win.
- Operational note: the single Black win is the game-26 proxy_fatal result caused by a readyok timeout from the White engine at the 16-ply opening boundary.
- Terminations: 43 checkmates, 2 insufficient-material draws, 2 fifty-move-rule draws, 2 threefold repetitions and 1 proxy_fatal readyok timeout.
- Mirrored-unit profile: StockfishJRC won 4 units, CorChess won 1 unit, and 20 units were drawn.
- TB reporting: both engines reported TB data in 49/50 games; the zero-hit game is the disclosed game-26 readyok-timeout incident.
- TBHitsTotal aggregate: 35,959,962.
- Games with zero TB hits: 1.
R16-M3 Knockout Closure
StockfishJRC-2.10-180526-sse41popcnt advances from R16-M3 after defeating CorChess 5 dev-20260227-3d8f4977 by 27.0–23.0. The match used the current M16 engine identity for StockfishJRC while preserving the regular-season seed authority from the official 1026-game Elo table. The match is accepted as an official knockout result because it closes exactly at 50 games, 25 mirrored opening units, 25W/25B per engine, pair ratio 0 and no scheduler pending state. Game 26 is disclosed as an operational readyok-timeout incident at the 16-ply opening boundary; even if that game is neutralised as a draw for conservative review, StockfishJRC remains ahead by 26.5–23.5 and bracket progression is unchanged.
R16-M4 Official Result — Stockfish 18 Advances
R16-M4 is closed after audit. The regular-season Elo table above remains unchanged and continues to be the seed authority; this block records only the knockout result played with the current M16 release identities.
| Engine | Score | Games | + = – | W / B | White score | Black score |
|---|---|---|---|---|---|---|
Stockfish 18 M16 engine ID: stockfish-windows-x86-64-sse41-popcnt | 26.0 | 50 | 22 = 8 – 20 | 25 / 25 | 23.5/25 | 2.5/25 |
Brainlearnjrc-2.60-200526-sse41popcnt Regular-season seed authority: Brainlearnjrc-2.30-10052-sse41popcnt M16 engine ID: Brainlearnjrc-2.60-200526-sse41popcnt | 24.0 | 50 | 20 = 8 – 22 | 25 / 25 | 22.5/25 | 1.5/25 |
R16-M4 audit controls
- PGN games: 50.
- JSON games: 50.
- Scheduler closure: openingIndex 50, pending null.
- Colour balance: 25 White and 25 Black for each engine.
- Mirrored units: 25/25 closed.
- Pair ratio: 0.
- PGN/JSON/scheduler parity: no discrepancy detected.
- Critical incidents: 0 proxy_fatal, 0 illegal_move, 0 no_bestmove, 0 crash/forfeit.
R16-M4 technical profile
- Result profile: 42 decisive games and 8 draws.
- Colour profile: White scored 46.0/50; Black scored 4.0/50.
- Terminations: 42 checkmates, 4 fifty-move-rule draws, 2 insufficient-material draws and 2 threefold repetitions.
- Mirrored-unit closure: 25 complete units; no orphan game and no pending state.
- TB reporting: both engines reported TB data in 50/50 games.
- TBHitsTotal aggregate: 37,059,452.
- Games with zero TB hits: 0.
R16-M4 Knockout Closure
Stockfish 18 advances from R16-M4 after defeating Brainlearnjrc-2.60-200526-sse41popcnt by 26.0–24.0. The match used the current M16 engine identity for Brainlearnjrc while preserving the regular-season seed authority from the official 1026-game Elo table. The match is accepted as an official knockout result because it closes exactly at 50 games, 25 mirrored opening units, 25W/25B per engine, pair ratio 0 and no scheduler pending state. The decisive margin is distributed evenly across colours: Stockfish 18 scored 23.5/25 with White and 2.5/25 with Black, while Brainlearnjrc scored 22.5/25 with White and 1.5/25 with Black.
R16-M5 Official Result — DarkSeid v10.7 SE Advances
R16-M5 is closed after audit. The regular-season Elo table above remains unchanged and continues to be the seed authority; this block records only the knockout result played with the current M16 release identities.
| Engine | Score | Games | + = – | W / B | White score | Black score |
|---|---|---|---|---|---|---|
DarkSeid v10.7 SE M16 engine ID: DarkSeid v10.7_SE_sse41 | 27.0 | 50 | 23 = 8 – 19 | 25 / 25 | 23.0/25 | 4.0/25 |
HypnoS 120126 M16 engine ID: HypnoS 120126-sse41-popcnt | 23.0 | 50 | 19 = 8 – 23 | 25 / 25 | 21.0/25 | 2.0/25 |
R16-M5 audit controls
- PGN games: 50.
- JSON games: 50.
- Scheduler closure: openingIndex 50, pending null.
- Colour balance: 25 White and 25 Black for each engine.
- Mirrored units: 25/25 closed.
- Pair ratio: 0.
- PGN/JSON/scheduler parity: no discrepancy detected.
- Critical incidents: 0 proxy_fatal, 0 illegal_move, 0 no_bestmove, 0 crash/forfeit.
R16-M5 technical profile
- Result profile: 42 decisive games and 8 draws.
- Colour profile: White scored 44.0/50; Black scored 6.0/50.
- Terminations: 41 checkmates, 5 threefold repetitions, 2 insufficient-material draws, 1 fifty-move-rule draw and 1 flag result.
- Mirrored-unit profile: DarkSeid won 4 units, HypnoS won 2 units, and 19 units were drawn.
- TB reporting: both engines reported TB data in 50/50 games.
- TBHitsTotal aggregate: 39,515,271.
- Games with zero TB hits: 0.
R16-M5 Knockout Closure
DarkSeid v10.7 SE advances from R16-M5 after defeating HypnoS 120126 by 27.0–23.0. The match used the current M16 engine identities while preserving the regular-season seed authority from the official 1026-game Elo table. The match is accepted as an official knockout result because it closes exactly at 50 games, 25 mirrored opening units, 25W/25B per engine, pair ratio 0 and no scheduler pending state. The match contained one normal flag termination in game 50, recorded as a White flag/time result for HypnoS and a Black win for DarkSeid; it is not an operational proxy incident and does not affect the audit pass.
R16-M6 Official Result — Revolution-5.60-100526 Advances
R16-M6 is closed after audit. The regular-season Elo table above remains unchanged and continues to be the seed authority; this block records only the knockout result played with the current M16 release identities.
| Engine | Score | Games | + = – | W / B | White score | Black score |
|---|---|---|---|---|---|---|
Revolution-5.60-100526-sse41popcnt M16 engine ID: Revolution-5.60-100526-sse41popcnt | 26.0 | 50 | 24 = 4 – 22 | 25 / 25 | 24.5/25 | 1.5/25 |
Brainlearn 31 M16 engine ID: Brainlearn31-x86-64-sse41-popcnt | 24.0 | 50 | 22 = 4 – 24 | 25 / 25 | 23.5/25 | 0.5/25 |
R16-M6 audit controls
- PGN games: 50.
- JSON games: 50.
- Scheduler closure: openingIndex 50, pending null.
- Colour balance: 25 White and 25 Black for each engine.
- Mirrored units: 25/25 closed.
- Pair ratio: 0.
- PGN/JSON/scheduler parity: no discrepancy detected.
- Critical incidents: 0 proxy_fatal, 0 illegal_move, 0 no_bestmove, 0 crash/forfeit.
R16-M6 technical profile
- Result profile: 46 White wins, 4 draws and 0 Black wins.
- Terminations: 46 checkmates, 2 threefold repetitions, 1 fifty-move-rule draw and 1 insufficient-material draw.
- Mirrored-unit profile: Revolution won 2 units, Brainlearn 31 won 0 units, and 23 units were drawn.
- TB reporting: both engines reported TB data in 50/50 games.
- TBHitsTotal aggregate: 39,316,369.
- Games with zero TB hits: 0.
R16-M6 Knockout Closure
Revolution-5.60-100526-sse41popcnt advances from R16-M6 after defeating Brainlearn 31 by 26.0–24.0. The match used the current M16 engine identities while preserving the regular-season seed authority from the official 1026-game Elo table. The match is accepted as an official knockout result because it closes exactly at 50 games, 25 mirrored opening units, 25W/25B per engine, pair ratio 0 and no scheduler pending state. The match was decided by two mirrored units; Revolution scored 24.5/25 with White and 1.5/25 with Black, while Brainlearn 31 scored 23.5/25 with White and 0.5/25 with Black.
R16-M7 Official Result — Main Match Tie Resolved by TB1
R16-M7 is closed after audit as a 25.0–25.0 main-match tie, and its official TB1 tiebreak is also closed after audit. SpecTral 15.3 defeated Hlamnick 070426 by 1.5–0.5 in the two-game mirrored TB1 mini-match and is now certified as the R16-M7 qualifier. The regular-season Elo table above remains unchanged and continues to be the seed authority.
| Engine | Score | Games | + = – | W / B | White score | Black score |
|---|---|---|---|---|---|---|
SpecTral 15.3 Regular-season seed authority: SpecTral 12_sse41 M16 engine ID: SpecTral_15.3-universal | 25.0 | 50 | 23 = 4 – 23 | 25 / 25 | 24.0/25 | 1.0/25 |
Hlamnick 070426 M16 engine ID: Hlamnick 070426_sse41 | 25.0 | 50 | 23 = 4 – 23 | 25 / 25 | 24.0/25 | 1.0/25 |
R16-M7 audit controls
- PGN games: 50.
- JSON games: 50.
- Scheduler closure: openingIndex 50, pending null.
- Colour balance: 25 White and 25 Black for each engine.
- Mirrored units: 25/25 closed.
- Pair ratio: 0.
- PGN/JSON/scheduler parity: no discrepancy detected.
- Critical incidents: 0 proxy_fatal, 0 illegal_move, 0 no_bestmove, 0 crash/forfeit.
R16-M7 technical profile
- Result profile: 46 White wins, 4 draws and 0 Black wins.
- Terminations: 46 checkmates, 1 threefold repetition, 1 fifty-move-rule draw, 1 stalemate and 1 insufficient-material draw.
- Mirrored-unit profile: SpecTral won 2 units, Hlamnick won 2 units, and 21 units were drawn.
- TB reporting: both engines reported TB data in 50/50 games.
- TBHitsTotal aggregate: 33,449,042.
- Games with zero TB hits: 0.
R16-M7 Knockout Closure
R16-M7 closes as an official audited main-match tie: SpecTral 15.3 and Hlamnick 070426 finished 25.0–25.0 after 50 games. The official TB1 tiebreak is now also closed and valid: SpecTral 15.3 defeated Hlamnick 070426 by 1.5–0.5 in a two-game mirrored mini-match at Blitz 5+2. The tiebreak preserved pair ratio 0, one White and one Black game per engine, one complete mirrored opening unit and scheduler pending null. SpecTral 15.3 is certified as the R16-M7 qualifier; Hlamnick 070426 is eliminated.
R16-M7-TB1 Official Result — SpecTral 15.3 Advances
TB1 was required because the main R16-M7 match ended 25.0–25.0. TB1 is closed after audit as a valid two-game mirrored mini-match.
| Engine | Score | Games | + = – | W / B | White score | Black score |
|---|---|---|---|---|---|---|
SpecTral 15.3 M16 engine ID: SpecTral_15.3-universal | 1.5 | 2 | 1 = 1 – 0 | 1 / 1 | 1.0/1 | 0.5/1 |
Hlamnick 070426 M16 engine ID: Hlamnick 070426_sse41 | 0.5 | 2 | 0 = 1 – 1 | 1 / 1 | 0.5/1 | 0.0/1 |
R16-M7-TB1 audit controls
- PGN games: 2.
- JSON games: 2.
- Scheduler closure: openingIndex 2, pending null.
- Colour balance: 1 White and 1 Black for each engine.
- Mirrored units: 1/1 closed.
- Pair ratio: 0.
- Opening block: A46 in both games.
- Critical incidents: 0 proxy_fatal, 0 illegal_move, 0 no_bestmove, 0 crash/forfeit.
R16-M7-TB1 technical profile
- Game 1: SpecTral 15.3 1–0 Hlamnick 070426 by checkmate.
- Game 2: Hlamnick 070426 1/2–1/2 SpecTral 15.3 by fifty-move rule.
- Terminations: 1 checkmate and 1 fifty-move-rule draw.
- TB reporting: both engines reported TB data in 2/2 games.
- TBHitsTotal aggregate: 1,227,213.
- Games with zero TB hits: 0.
R16-M7-TB1 Knockout Closure
SpecTral 15.3 advances from R16-M7 after winning TB1 by 1.5–0.5. TB2 is not required. The tiebreak used the same IJCCRL mirrored principle as the main match: two games, one opening line, reversed colours, one White and one Black game per engine and pair ratio 0.
R16-M8 Official Result — Killfish PB 010426 Advances
R16-M8 is closed after audit. The regular-season Elo table above remains unchanged and continues to be the seed authority; this block records only the knockout result played with the current M16 release identities.
| Engine | Score | Games | + = – | W / B | White score | Black score |
|---|---|---|---|---|---|---|
Killfish PB 010426 M16 engine ID: Killfish PB 010426_sse41_popcnt | 26.5 | 50 | 22 = 9 – 19 | 25 / 25 | 22.5/25 | 4.0/25 |
Artemis 28.2TR_PrO M16 engine ID: Artemis 28.2TR_PrO_sse41 | 23.5 | 50 | 19 = 9 – 22 | 25 / 25 | 21.5/25 | 2.0/25 |
R16-M8 audit controls
- PGN games: 50.
- JSON games: 50.
- Scheduler closure: openingIndex 50, pending null.
- Colour balance: 25 White and 25 Black for each engine.
- Mirrored units: 25/25 closed.
- Pair ratio: 0.
- PGN/JSON/scheduler parity: no discrepancy detected.
- Critical incidents: 0 proxy_fatal, 0 illegal_move, 0 no_bestmove, 0 crash/forfeit.
R16-M8 technical profile
- Result profile: 41 decisive games and 9 draws.
- Terminations: 41 checkmates, 5 threefold repetitions, 3 insufficient-material draws and 1 fifty-move-rule draw.
- Mirrored-unit profile: Killfish won 4 units, Artemis won 1 unit, and 20 units were drawn.
- TB reporting: both engines reported TB data in 50/50 games.
- TBHitsTotal aggregate: 35,120,551.
- Games with zero TB hits: 0.
R16-M8 Knockout Closure
Killfish PB 010426 advances from R16-M8 after defeating Artemis 28.2TR_PrO by 26.5–23.5. The match used the current M16 engine identities while preserving the regular-season seed authority from the official 1026-game Elo table. The match is accepted as an official knockout result because it closes exactly at 50 games, 25 mirrored opening units, 25W/25B per engine, pair ratio 0 and no scheduler pending state. The match does not require a tiebreak. With the subsequent R16-M7-TB1 closure, all Round of 16 advancement slots are now resolved.
Audit controls
- Raw result records before sanitation: 1027.
- Official games after sanitation: 1026.
- Engines: 19.
- Per-engine contract: 108 games, 54 White and 54 Black.
- Pairing doctrine: mirrored opening units, pair ratio 0.
- Scheduler closure: openingIndex 1026, no pending game.
- Tablebase policy: TB 1–6 enabled.
Sanitation note
- Removed duplicate slot: cycle 4, openingIndex 72, pair 9, pairGameNo 2.
- Removed game ID: game-2-R4-P9-G2-S2-Deepalienist-4.40-100526-sse41popcnt-vs-Dark SisTer_15_sse41-popcnt-2026-05-12-0030.
- Removed result: 1/2-1/2.
- Reason: the game had no new mirrored partner and gave Deepalienist one extra White game and Dark SisTer one extra Black game.
- Post-sanitation result: all engines are balanced at 108 games and exact 54W / 54B.
Official Publication Doctrine
This page publishes the official cleaned regular-season rating list for the Derived Stockfish Track. The deleted duplicate is excluded from the public rating surface because it violates the mirrored-pair contract. The official list uses 1026 games, 345 draws and 681 decisive games; White scored 840.5/1026 (81.92%). The top 16 engines advanced to the Round of 16 bracket configured above. R16-M1 through R16-M8, including the R16-M7-TB1 tiebreak, remain preserved as official knockout records. R8-M1 through R8-M4 also remain preserved as official Round of 8 records, with Dark SisTer 15.3, SF TACTICAL 270426, StockfishJRC and DarkSeid v10.7 SE qualifying for the semifinals. The semifinal layer is now closed: SF-M1 is recorded as DarkSeid v10.7 SE defeating Dark SisTer 15.3 by 26.0–24.0, but its detailed artefacts were not retained after a later NEW_TOURNAMENT start and therefore no unavailable technical metrics are reconstructed; SF-M2 is fully audited and closed as StockfishJRC-2.20-070626-sse41popcnt defeating SF TACTICAL 270426 by 26.0–24.0 after 50 games, with 25 complete mirrored opening units, 25W/25B per engine and pair ratio 0. The certified final result is StockfishJRC-2.20-070626-sse41popcnt 52.0–48.0 DarkSeid v10.7 SE, and StockfishJRC-2.20-070626-sse41popcnt is the Derived Stockfish Track champion.