Blitz Rating List — IJCCRL Arena Series — Original UCI Track

Official SF-M1 result

Rules+ audit controls

• Audit verdict: AUDIT PASS after canonical mirrored cut.
• Match: Q4 SF-M1 — Regular Season #1 Stockfish 18 vs #4 Caissa 1.24 POPCNT.
• Format: Blitz 5+2, fixed mirrored opening match.
• Raw scheduler closure: 200 games, openingIndex 200 and pending null.
• Raw colour balance: exact 100 White and 100 Black games per engine.
• Technical incidents: 9 proxy_fatal results, all readyok timeout (12000ms).
• Affected mirrored units: 7.
• Excluded games: 14 total — 9 direct proxy_fatal records plus 5 mirror counterparts removed solely to preserve complete units.
• Accepted corpus: 186 games.
• Accepted colour balance: exact 93 White and 93 Black games per engine.
• Mirrored structure: 93/93 complete two-game units.
• Pair ratio: 0.
• Accepted proxy_fatal results: 0.
• Tiebreak required: no.
• Official decision: Stockfish 18 advances to the final.

Canonical result structure

• Checkmate: 88 games.
• Threefold repetition: 50 games.
• Insufficient material: 25 games.
• 50-move rule: 16 games.
• Stalemate: 4 games.
• Flag: 3 games.
• Proxy_fatal accepted: 0.
• The three sporting flag results remain valid because they followed competitive play and are not infrastructure/proxy failures.

Forensic evidence

• Affected OpeningIndex units removed: 7–8, 9–10, 93–94, 101–102, 103–104, 139–140 and 141–142.
• PGN and results.json contain 200 aligned raw records; scheduler_state.json confirms 200 games, 100 White / 100 Black per engine and pending null.
• 100 opening lines are present in the raw match as two-game colour-reversed units.
• games PGN SHA256: 5A509D3BB0DBBA6C0F6C0335C34B67E5D863B585AB0E4138A24D948D503B73CC.
• results.json SHA256: 5D255DCA5AE0F86CAB5E176C4C5F38A72096017D41977365475691D631596340.
• scheduler_state.json SHA256: 103DA9CB36BE606B0121425AFC39214D283344C571E593FB5532A3827EBB86BE.
• Official knockout record: Stockfish 18 advances over Caissa 1.24 POPCNT by 117.5–68.5.

Official Q8-M1 result

Rules+ audit controls

• Audit verdict: AUDIT PASS.
• Match: Q8-M1 — Regular Season #1 Stockfish 18 vs #8 Clover 9.1.
• Format: Blitz 5+2, fixed mirrored opening match.
• Games: 200/200 valid; no forensic cut required.
• Scheduler closure: openingIndex 200, final pairGameNo 2 and pending null.
• Colour balance: exact 100 White and 100 Black games per engine.
• Mirrored structure: 100/100 two-game opening units closed.
• Opening integrity: 100 distinct lines, each used exactly twice with colours reversed.
• Pair ratio: 0.
• PGN / results.json / scheduler_state.json parity: verified across all 200 games.
• Tiebreak required: no.
• Official decision: Stockfish 18 advances.

Result and termination structure

• Decisive games: 102; drawn games: 98.
• Checkmate: 102 games.
• Insufficient material: 39 games.
• Threefold repetition: 37 games.
• 50-move rule: 20 games.
• Stalemate: 2 games.
• All 102 decisive games ended by checkmate.
• No incomplete mirrored unit and no duplicated match ID were found.

Colour and technical notes

• White wins: 99; Black wins: 3; draws: 98.
• Aggregate White score: 148.0/200 (74.00%).
• Stockfish by colour: 92.0/100 as White and 44.0/100 as Black.
• Clover by colour: 56.0/100 as White and 8.0/100 as Black.
• The strong White bias does not invalidate the match because every one of the 100 opening lines is played with reversed colours.
• TB reporting is present for both engines in all games and TBHitsWhite + TBHitsBlack = TBHitsTotal throughout the package.
• No crash, timeout/flag forfeit, readyok timeout, illegal move, disconnect, aborted game, engine error or external/manual adjudication was found.

Official Q8-M3 result

Rules+ audit controls

• Audit verdict: AUDIT PASS after canonical mirrored cut.
• Match: Q8-M3 — Regular Season #3 Obsidian dev-16.15 vs #6 Berserk 14.
• Format: Blitz 5+2, fixed mirrored opening match.
• Raw scheduler closure: 200 games, openingIndex 200 and pending null.
• Raw colour balance: exact 100 White and 100 Black games per engine.
• Technical incidents: 7 proxy_fatal results, all readyok timeout (12000ms), all at 16 plies.
• Affected mirrored units: 6.
• Excluded games: 12 total — the 7 proxy_fatal records plus 5 otherwise playable mirror counterparts.
• Accepted corpus: 188 games.
• Accepted colour balance: exact 94 White and 94 Black games per engine.
• Mirrored structure: 94/94 complete two-game units.
• Pair ratio: 0.
• Accepted proxy_fatal results: 0.
• Tiebreak required: no.
• Official decision: Obsidian dev-16.15 advances.

Canonical result structure

• Checkmate: 81 games.
• Threefold repetition: 51 games.
• Insufficient material: 36 games.
• 50-move rule: 9 games.
• Flag: 7 games.
• Stalemate: 4 games.
• Proxy_fatal accepted: 0.
• The seven sporting flag results remain valid because they followed normal competitive play and are not infrastructure/proxy failures.

Forensic and publication notes

• The 200 PGN records and 200 JSON records remain structurally aligned in the raw package.
• The 100 opening lines occur as colour-reversed two-game units in the raw match.
• All seven technical failures occur at the same readyok boundary and cannot be treated as normal played losses.
• Removing complete affected units preserves colour equality and the IJCCRL pair-ratio doctrine.
• Canonical score difference: +18.0 points for Obsidian.
• Official knockout record: Obsidian dev-16.15 advances over Berserk 14 by 103.0–85.0.

Official Q8-M4 result

Rules+ audit controls

• Audit verdict: AUDIT PASS after canonical mirrored cut.
• Match: Q8-M4 — Regular Season #4 Caissa 1.24 POPCNT vs #5 Dragon 3.3.
• Format: Blitz 5+2, fixed mirrored opening match.
• Raw scheduler closure: 200 games, openingIndex 200 and pending null.
• Raw colour balance: exact 100 White and 100 Black games per engine.
• Technical incidents: 1 proxy_fatal result caused by readyok timeout (12000ms), at OpeningIndex 29 and 16 plies.
• Affected mirrored unit: A88, OpeningIndex 29–30.
• Excluded games: 2 total — the proxy_fatal record plus its mirror counterpart.
• Accepted corpus: 198 games.
• Accepted colour balance: exact 99 White and 99 Black games per engine.
• Mirrored structure: 99/99 complete two-game units.
• Pair ratio: 0.
• Accepted proxy_fatal results: 0.
• Tiebreak required: no.
• Official decision: Caissa 1.24 POPCNT advances to Q4.

Canonical termination structure

• Checkmate: 85 games.
• Threefold repetition: 98 games.
• Insufficient material: 8 games.
• 50-move rule: 6 games.
• Stalemate: 1 game.
• Proxy_fatal accepted: 0.
• Total TB hits in the accepted corpus: 36,002,152.

Forensic and publication notes

• The raw PGN and results package contain 200 aligned records; the scheduler closes on the second game of the final mirrored unit.
• OpeningIndex 29 is excluded because it is an infrastructure/proxy failure rather than a played chess result.
• OpeningIndex 30 is excluded solely to preserve the complete mirrored A88 unit and exact colour equality.
• Removing the complete affected unit preserves pair ratio 0 and changes the raw 104.0–96.0 score to the canonical 103.5–94.5 score.
• The identity of the winner is unchanged by the correction.
• Official knockout record: Caissa 1.24 POPCNT advances over Dragon 3.3 by 103.5–94.5.

Official Grand Final result

Rules+ audit controls

• Audit verdict: AUDIT PASS after canonical mirrored cut.
• Match: Grand Final — Stockfish 18 vs Obsidian dev-16.15.
• Format: Blitz 5+2, fixed mirrored opening match.
• Raw scheduler closure: 600 games, 300 mirrored units, openingIndex 600 and pending null.
• Raw colour balance: exact 300 White and 300 Black games per engine.
• Technical incidents: 5 proxy_fatal results, all readyok timeout (12000ms).
• Affected mirrored units: 4.
• Excluded games: 8 total — five direct technical records plus their required mirror counterparts where necessary to preserve complete units.
• Accepted corpus: 592 games.
• Accepted colour balance: exact 296 White and 296 Black games per engine.
• Mirrored structure: 296/296 complete two-game units.
• Pair ratio: 0.
• Accepted proxy_fatal results: 0.
• Tiebreak required: no.
• Official decision: Stockfish 18 is champion.

Canonical result structure

• Checkmate: 270 games.
• Threefold repetition: 153 games.
• Flag: 80 games.
• Insufficient material: 48 games.
• 50-move rule: 29 games.
• Stalemate: 12 games.
• Proxy_fatal accepted: 0.
• The 80 sporting flag results remain valid because they followed competitive play and are not infrastructure/proxy failures.

Forensic evidence and champion record

• Affected complete mirrored ranges removed: OpeningIndex 21–22, 23–24, 199–200 and 251–252.
• The raw package contains 600 unique game IDs and closes with exact 300 / 300 colour balance per engine.
• After the mirrored cut, all 296 accepted opening units remain complete with colours reversed and pair ratio 0.
• PGN / results.json / scheduler_state.json parity was verified across the canonical corpus.
• Raw score: Stockfish 407.5–192.5 Obsidian.
• Canonical score after the Rules+ mirrored cut: Stockfish 403.0–189.0 Obsidian.
• Stockfish 18 canonical W-D-L: 282-242-68.
• Obsidian dev-16.15 canonical W-D-L: 68-242-282.
• Stockfish author: The Stockfish developers.
• games.pgn SHA256: 4000831BFCF795A8741788307FF18BD6238C827126F97DCBAEBDFF33774C72C5.
• results.json SHA256: F6C3562F6444B6161163686502FEAA7BCA1D8E53946BE0744F6043DA12E67EC6.
• scheduler_state.json SHA256: 67A5855CB974B46BEE8D41AA24BA11CB46F69569502C4F328655EC68AAA18127.
• Official champion: Stockfish 18.

Official result

Audit controls

• Audit verdict: AUDIT PASS.
• Match: IJCCRL Arena Series 2026 — Original UCI Track — Semifinal SF-M1 — Stockfish vs Alexandria.
• Format: Blitz 5+2, fixed mirrored match.
• Games: 50/50 closed.
• Scheduler state: openingIndex 50 and pending null.
• Colour balance: exact 25 White and 25 Black games per engine.
• Mirrored structure: 25/25 UHO opening units closed.
• Pair ratio: 0.
• Opening authority: UHO_2024_8mvs_big_+100_+119.pgn, lines #1–#25.
• PGN/results/scheduler/watchdog consistency: verified.
• Tiebreak required: no.
• Official semifinal decision: Stockfish advances to the final.

Result structure

• PGN result distribution: 36 wins for White, 14 draws and 0 wins for Black.
• Colour score: White 43.0/50, Black 7.0/50.
• Stockfish by colour: 24.0/25 as White and 6.0/25 as Black.
• Alexandria by colour: 19.0/25 as White and 1.0/25 as Black.
• Mirrored-unit distribution: 11 units won by Stockfish, 1 unit won by Alexandria and 13 units split 1.0–1.0.
• No incomplete mirrored unit was found.

Technical notes

• Termination distribution: 36 checkmates, 6 threefold repetitions, 4 stalemates, 2 games by the 50-move rule and 2 insufficient-material results.
• Total recorded TB hits: 10,373,896.
• Telemetry note: TB hits are recorded on the Stockfish side in the audited package; Alexandria reports 0 TB hits in the same records.
• This TB telemetry difference is documented as a reporting/configuration caveat and does not affect the match result.
• Official knockout record: Stockfish wins SF-M1 by 30.0–20.0 and reaches the final.

Official result

Audit controls

• Audit verdict: AUDIT PASS.
• Match: IJCCRL Arena Series 2026 — Original UCI Track — Semifinal SF-M2 — Reckless vs Obsidian.
• Format: Blitz 5+2, fixed mirrored match.
• Games: 50/50 closed.
• Scheduler state: openingIndex 50 and pending null.
• Colour balance: exact 25 White and 25 Black games per engine.
• Mirrored structure: 25/25 UHO opening units closed.
• Pair ratio: 0.
• PGN/results/scheduler consistency: verified.
• Tiebreak required: no.
• Official semifinal decision: Reckless advances to the final.

Result structure

• PGN result distribution: 39 wins for White, 11 draws and 0 wins for Black.
• Colour score: White 44.5/50, Black 5.5/50.
• Reckless by colour: 24.5/25 as White and 5.0/25 as Black.
• Obsidian by colour: 20.0/25 as White and 0.5/25 as Black.
• Mirrored-unit structure: 25 closed two-game opening units.
• No incomplete mirrored unit was found.

Technical notes

• Termination distribution: 39 checkmates, 4 insufficient-material results, 3 games by the 50-move rule, 3 threefold repetitions and 1 stalemate.
• No timeout, readyok-timeout, crash, illegal move, forfeit, disconnect or engine-error evidence was found in the audited package.
• Official knockout record: Reckless wins SF-M2 by 29.5–20.5 and reaches the final.
• The final pairing is therefore Stockfish dev-20260426-1a882efc vs Reckless 0.10.0-dev-8ba888c6.

Official final result

Final audit controls

• Audit verdict: AUDIT PASS.
• Match: IJCCRL Arena Series 2026 — Original UCI Track — Blitz 5+2 — Final — Stockfish vs Reckless.
• Format: fixed mirrored final.
• Games: 100/100 closed.
• Scheduler state: openingIndex 100 and pending null.
• Colour balance: exact 50 White and 50 Black games per engine.
• Mirrored structure: 50/50 UHO opening units closed.
• Pair ratio: 0.
• Time control: 300+2.
• PGN/results/scheduler consistency: verified.
• Tiebreak required: no.
• Official final decision: Stockfish is champion.

Result structure

• PGN result distribution: 83 wins for White, 17 draws and 0 wins for Black.
• Colour score: White 91.5/100, Black 8.5/100.
• Stockfish by colour: 48.5/50 as White and 7.0/50 as Black.
• Reckless by colour: 43.0/50 as White and 1.5/50 as Black.
• Mirrored-unit distribution: 37 units split 1.0–1.0, 12 units won by Stockfish 1.5–0.5 and 1 unit won by Reckless 1.5–0.5.
• No incomplete mirrored unit was found.

Technical notes

• Termination distribution: 83 checkmates, 7 threefold repetitions, 7 insufficient-material results, 2 games by the 50-move rule and 1 stalemate.
• Total recorded TB hits: 46,921,416.
• No timeout, readyok-timeout, forfeit, crash, illegal move, disconnect, engine error or exception evidence was found in the audited final package.
• ZIP package SHA256: 0915631152d8472610973a30086947fe01d3973d30ff3fd4a6dbb26dc2f5f029.
• games.pgn SHA256: 0750db18e6a62edbcdd6ac08d97b2b20dd578daf1773b249aaad13f5bd816cc0.
• Official champion: Stockfish dev-20260426-1a882efc.

Official result

Audit controls

• Audit verdict: AUDIT PASS.
• Match: IJCCRL Arena Series 2026 — Original UCI Track — R8M-M2 — Reckless vs Horsie.
• Format: Blitz 5+2, fixed mirrored match.
• Games: 50/50 closed.
• Scheduler state: openingIndex 50 and pending null.
• Colour balance: exact 25 White and 25 Black games per engine.
• Mirrored structure: 25/25 mirrored opening units closed.
• Pair ratio: 0.
• Opening authority: UHO_2024_8mvs_big_+100_+119.pgn, lines #1–#25.
• PGN/results/scheduler consistency: verified.

Result structure

• PGN result distribution: 35 wins for White, 15 draws and 0 wins for Black.
• Colour score: White 42.5/50, Black 7.5/50.
• Reckless by colour: 25.0/25 as White and 7.5/25 as Black.
• Horsie by colour: 17.5/25 as White and 0.0/25 as Black.
• Mirrored-unit distribution: 15 units won by Reckless 1.5–0.5 and 10 units split 1.0–1.0.
• No incomplete mirrored unit was found.

Technical notes

• Termination distribution: 35 checkmates, 9 games by the 50-move rule, 4 threefold repetitions and 2 insufficient-material results.
• Total recorded TB hits: 15,530,988.
• Telemetry note: recorded TB hits appear on the Reckless side; Horsie reports 0 TB hits in the audited records.
• This TB telemetry difference is documented as a reporting/configuration caveat and does not affect the match result.
• Official knockout record: Reckless advances over Horsie by 32.5–17.5.

Official result

Audit controls

• Audit verdict: AUDIT PASS after 50-game package normalization.
• Match: IJCCRL Arena Series 2026 — Original UCI Track — R8M-M3 — Obsidian vs RubiChess.
• Format: Blitz 5+2, fixed mirrored match.
• Games: 50/50 closed in the corrected publication package.
• Colour balance: exact 25 White and 25 Black games per engine.
• Pair ratio: 0.
• PGN/results/scheduler consistency: verified after removing the two surplus games.
• Tiebreak required: no.
• Official knockout record: Obsidian advances over RubiChess by 35.0–15.0.

Result structure

• PGN result distribution: 32 wins for White, 14 draws and 4 wins for Black.
• Colour score: White 39.0/50, Black 11.0/50.
• Obsidian by colour: 24.5/25 as White and 10.5/25 as Black.
• RubiChess by colour: 14.5/25 as White and 0.5/25 as Black.
• Termination distribution: 36 checkmates, 13 threefold repetitions and 1 game by the 50-move rule.
• Total recorded TB hits: 21,566,007.

Normalization note

• The downloaded raw package contained 52 games.
• The corrected audit package removes the two surplus games from the same final C25 opening block to restore the official 50-game contract.
• The corrected package keeps exact 25 White and 25 Black games per engine.
• The corrected score is Obsidian 35.0–15.0 RubiChess.
• The sporting decision is unchanged: Obsidian wins the match without tiebreak.

Official result

Audit controls

• Audit verdict: AUDIT PASS after mirrored 50-game correction.
• Match: IJCCRL Arena Series 2026 — Original UCI Track — R8M-M4 — Alexandria vs Clover.
• Format: Blitz 5+2, fixed mirrored match.
• Games: 50/50 closed in the corrected publication package.
• Colour balance: exact 25 White and 25 Black games per engine.
• Pair ratio: 0.
• PGN/results/scheduler consistency: verified after removing one surplus mirrored unit from the 52-game raw archive.
• Tiebreak required: no.
• Official knockout record: Alexandria advances over Clover by 27.5–22.5.

Result structure

• PGN result distribution: 33 wins for White, 17 draws and 0 wins for Black.
• Colour score: White 41.5/50, Black 8.5/50.
• Alexandria by colour: 22.0/25 as White and 5.5/25 as Black.
• Clover by colour: 19.5/25 as White and 3.0/25 as Black.
• All decisive games in the corrected PGN were won by White.
• The sporting decision is clear: Alexandria wins the match by 5 points without tiebreak.

Normalization note

• The downloaded raw package contained 52 games.
• A simple first-50 truncation was rejected because it produced Alexandria 26W / 24B and Clover 24W / 26B.
• The corrected audit package removes one complete mirrored unit so that both engines remain at 25 White and 25 Black games.
• The corrected score is Alexandria 27.5–22.5 Clover.
• Operational note for the next scripts: stop exactly at 50 games and avoid inherited Source labels from previous match launchers.

Accepted subset result

Audit controls

• Accepted publication status: corrected 48-game balanced subset.
• Raw package integrity: SHA256 verified.
• Raw package: 50 PGN games, results.json present and scheduler_state.json present.
• Raw 50-game issue: colour balance failed at 26/24 instead of 25/25.
• Accepted subset: first 48 games only.
• Accepted subset colour balance: exact 24 White and 24 Black games per engine.
• Tiebreak required: no.
• Official bracket consequence: Viridithas advances over Caissa by 26.5–21.5 on the accepted subset.

Result structure

• Accepted subset PGN result distribution: 37 wins for White, 11 draws and 0 wins for Black.
• Colour score in accepted subset: White 42.5/48, Black 5.5/48.
• Viridithas by colour: 22.5/24 as White and 4.0/24 as Black.
• Caissa by colour: 20.0/24 as White and 1.5/24 as Black.
• Termination distribution in accepted subset: 37 checkmates, 6 threefold repetitions and 5 insufficient-material results.
• Total recorded TB hits in accepted subset: 2,588,019.

Correction note

• The raw 50-game result was Viridithas 28.5–21.5 Caissa.
• The raw 50-game result is not used as the official bracket result because the final mirrored cycle was incomplete.
• The excluded games are the last two games of the raw package, both from the incomplete final C25 block with Viridithas as White.
• This restores balanced engine colours but does not claim the originally intended 25 mirrored opening units.
• Operational action: the Ubuntu Node launcher must be corrected so it advances the opening only after the complete colour-reversed mirrored unit and stops on a contract that preserves colour balance.

Audit controls

• Raw scheduler closure: 540 games, openingIndex 540, pending null.
• Raw per-engine balance: 108 games, 54 White and 54 Black.
• Technical exclusions: 6 proxy_fatal results caused by readyok timeout (12000ms).
• Excluded complete cycles: opening indexes 61–70 and 221–230.
• Accepted corpus: 520 games.
• Accepted per-engine state: 104 games, 52 White and 52 Black for every engine.
• Mirrored structure: 260 complete accepted units.
• Pair ratio: 0.
• Accepted proxy_fatal results: 0.
• PGN/results structural parity across the accepted corpus: verified.

Accepted result structure

• Checkmate: 222 games.
• Threefold repetition: 160 games.
• Insufficient material: 59 games.
• Flag: 42 games.
• 50-move rule: 32 games.
• Stalemate: 5 games.
• Sporting flags are retained; only infrastructure/proxy-fatal adjudications are excluded.
• Regular Season winner: Stockfish 18 with 77.0/104.
• Top 8 qualify for Q8; RubiChess and Integral are eliminated from this stage.