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- Create Date February 21, 2026
- Last Updated February 21, 2026
LesChats bin book opening 220226
IJCCRL Verified
LesChats-220226 is a maintenance-and-quality release of the IJCCRL opening book for
Fritz-compatible CTG workflows. The primary goal of this update is practical reliability:
expanding coverage while actively reducing the probability of “dark” or low-credibility moves entering the
playable book surface.
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File size updated: from
141340 MBto141935 MB. -
Dataset expansion: 400+ audited games were added to strengthen the reference base and
reduce noisy or “dark” move artefacts. -
White opening balance preserved: 1.e4 and 1.d4 remain explicitly maintained at
50% / 50% to keep the book strategically diversified and tournament-stable.
Note: this update focuses on quality control + controlled growth, not cosmetic re-ordering.
The intention is to increase robustness in engine tournaments where small book artefacts can snowball into bias.
This release increases the underlying game corpus by adding more than 400 games that were
specifically audited with the aim of eliminating obscure or low-signal moves.
- Scope: expand coverage without compromising book coherence.
- Quality objective: reduce “dark move” pollution (rare, untrusted, or strategically incoherent choices).
- Practical goal: improve repeatability and stability in tournament conditions.
The book continues to enforce a deliberate strategic balance for White by keeping
1.e4 and 1.d4 at 50% each. This reduces the likelihood of systemic bias
and avoids overfitting to a single opening family.
- Why it matters: balanced first-move policy improves comparative fairness across engines.
- Practical effect: broader opponent-prep resistance and more representative tournament sampling.
LesChats-220226 remains a CTG-format opening book intended for the Fritz GUI ecosystem,
with release-level emphasis on compatibility and stability for production tournament use.
LesChats-220226 is a quality-focused opening book update: the file grows modestly
(141340 MB → 141935 MB), the dataset expands with 400+ audited games to reduce
“dark move” artefacts, and the top-level White policy remains explicitly balanced with
1.e4 / 1.d4 at 50% / 50%. The result is a more robust and tournament-safe book surface while preserving
IJCCRL’s principles of controlled, auditable evolution.