Caissa 1.22 - new version chess engine

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Another version of a very powerful chess engine has appeared, which wants to beat Stockfish. We are very happy about this - we will do the first tests of this version of the engine for you soon.

Caissa - UCI chess engine,  Author: Michał Witanowski
Rating Chess Engines Diary CEDR=3709

v.1.22:
Caissa just got a little smarter and a lot more fun - especially in strange “queens-only” or "rook-only" setups, where it now crushes Stockfish and beats its own previous version by +500 Elo.

Changes
Tweaked how deep singular extensions go.
Added extra negative extensions.
Late-move reductions (LMR) are now fully deterministic.
Quiescence search now averages stand-pat scores.
Time-manager tweaks.
Transposition table clears faster on multi-core CPUs.
Fresh neural net trained on 15B positions.
Special sauce
In positions with only queens on the first rank (e.g. qqqqkqqq/pppppppp/8/8/8/8/PPPPPPPP/QQQQKQQQ w - - 0 1) Caissa 1.22 gains a massive +500 Elo over 1.21, putting it far ahead of Stockfish in that odd corners of chess.

Measured gains
Book: UHO_Lichess_4852_v1.epd

Elo   | 16.96 +- 3.61 (95%)
Conf  | 60.0+0.60s Threads=1 Hash=128MB
Games | N: 8508 W: 2158 L: 1743 D: 4607
Penta | [4, 801, 2237, 1200, 12]
Elo   | 16.62 +- 3.09 (95%)
Conf  | 8.0+0.08s Threads=1 Hash=8MB
Games | N: 13284 W: 3449 L: 2814 D: 7021
Penta | [43, 1313, 3327, 1884, 75]

Caissa 1.21 - results:
Alexandria 7.1.072/136+8136 Games
Starzix 6.067.5/104+31104 Games
RubiChess 2024081757.5/96+1996 Games
Berserk 2024111944/85+385 Games
Motor 0.8.0 JA46.5/79+1479 Games
PlentyChess 3.0.144.5/77+1277 Games
Dragon 3.339.5/75+475 Games
Viridithas 15.0.040.5/71+1071 Games
Integral v532.5/55+1055 Games
Stormphrax 6.0.032/55+955 Games
Integral v631/54+854 Games
Berserk 1327.5/53+253 Games
Velvet 8.1.1 JA33.5/49+1849 Games
PlentyChess 4.0.122/47-347 Games
Alexandria 7.0.14 JA26.5/45+845 Games
Lizard 11.2.021/40+240 Games
Lizard 11.1.023.5/39+839 Games
Stockfish 1717.5/36-136 Games
PlentyChess 3.0.018.5/34+334 Games
Devre 6.39 JA20/33+733 Games
Horsie 1.0.6 JA18/33+333 Games
Obsidian 14.01 SE16.5/32+132 Games
Uralochka 3.42 dev718/28+828 Games
Clover 8.1 JA16/27+527 Games
Berserk 2025020314/27+127 Games
Yuliana 5.5012/27-327 Games
Integral 7.0.0 JA14.5/25+425 Games
Obsidian 15.04 SE12.5/25+025 Games
Big Yuli GM 22102412/25-125 Games
Velvet 8.1.014.5/23+623 Games
Obsidian 14.23 SE11/22+022 Games
Chess-System-Tal-213.5/21+621 Games
Obsidian 14.05 SE11/21+121 Games
Titan 1.1.012/20+420 Games




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