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: Michaล 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 7.1.0 | 72/136 | +8 | 136 Games |
| Starzix 6.0 | 67.5/104 | +31 | 104 Games |
| RubiChess 20240817 | 57.5/96 | +19 | 96 Games |
| Berserk 20241119 | 44/85 | +3 | 85 Games |
| Motor 0.8.0 JA | 46.5/79 | +14 | 79 Games |
| PlentyChess 3.0.1 | 44.5/77 | +12 | 77 Games |
| Dragon 3.3 | 39.5/75 | +4 | 75 Games |
| Viridithas 15.0.0 | 40.5/71 | +10 | 71 Games |
| Integral v5 | 32.5/55 | +10 | 55 Games |
| Stormphrax 6.0.0 | 32/55 | +9 | 55 Games |
| Integral v6 | 31/54 | +8 | 54 Games |
| Berserk 13 | 27.5/53 | +2 | 53 Games |
| Velvet 8.1.1 JA | 33.5/49 | +18 | 49 Games |
| PlentyChess 4.0.1 | 22/47 | -3 | 47 Games |
| Alexandria 7.0.14 JA | 26.5/45 | +8 | 45 Games |
| Lizard 11.2.0 | 21/40 | +2 | 40 Games |
| Lizard 11.1.0 | 23.5/39 | +8 | 39 Games |
| Stockfish 17 | 17.5/36 | -1 | 36 Games |
| PlentyChess 3.0.0 | 18.5/34 | +3 | 34 Games |
| Devre 6.39 JA | 20/33 | +7 | 33 Games |
| Horsie 1.0.6 JA | 18/33 | +3 | 33 Games |
| Obsidian 14.01 SE | 16.5/32 | +1 | 32 Games |
| Uralochka 3.42 dev7 | 18/28 | +8 | 28 Games |
| Clover 8.1 JA | 16/27 | +5 | 27 Games |
| Berserk 20250203 | 14/27 | +1 | 27 Games |
| Yuliana 5.50 | 12/27 | -3 | 27 Games |
| Integral 7.0.0 JA | 14.5/25 | +4 | 25 Games |
| Obsidian 15.04 SE | 12.5/25 | +0 | 25 Games |
| Big Yuli GM 221024 | 12/25 | -1 | 25 Games |
| Velvet 8.1.0 | 14.5/23 | +6 | 23 Games |
| Obsidian 14.23 SE | 11/22 | +0 | 22 Games |
| Chess-System-Tal-2 | 13.5/21 | +6 | 21 Games |
| Obsidian 14.05 SE | 11/21 | +1 | 21 Games |
| Titan 1.1.0 | 12/20 | +4 | 20 Games |
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