Chess engine: Caissa 1.21

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=3699

v.1.21:

Progression test

TC=60+0.6s, Book=UHO_Lichess_4852_v1.epd

Elo   | 35.09 +- 4.16 (95%)

Conf  | 60.0+0.60s Threads=1 Hash=128MB

Games | N: 6278 W: 1758 L: 1126 D: 3394

Penta | [2, 446, 1624, 1052, 15]

TC=8+0.08s, Book=UHO_Lichess_4852_v1.epd

Elo   | 22.65 +- 3.68 (95%)

Conf  | 8.0+0.08s Threads=1 Hash=8MB

Games | N: 10000 W: 2812 L: 2161 D: 5027

Penta | [31, 974, 2402, 1499, 94]

TC=10+0.1s, Book=DFRC.epd

Elo   | 18.98 +- 5.35 (95%)

Conf  | 10.0+0.10s Threads=1 Hash=16MB

Games | N: 5002 W: 1114 L: 841 D: 3047

Penta | [38, 462, 1258, 675, 68]

Changes

Fixed problems detected by sanitizers that could lead to potential crashes.

New neural network trained on a total of 13 billion positions.

Improved eval correction (Stockfish style).

Tuned parameters at long time control.

Various search improvements.

Caissa 1.20 - results:

Opponent	Score	+-	Games
Obsidian 13.0	27.5/52	+3	52 Games
Berserk 13	20.5/40	+1	40 Games
Chess-System-Tal-2	25/36	+14	36 Games
Ethereal 14.25	19.5/36	+3	36 Games
PlentyChess 3.0.0	18.5/36	+1	36 Games
Alexandria 7.0.0	20.5/33	+8	33 Games
Stockfish 16.1	16.5/33	+0	33 Games
Uralochka 3.41a JA	21/32	+10	32 Games
Motor 0.7.0	16.5/30	+3	30 Games
Titan 1.1.0	16/28	+4	28 Games
Yuliana 5.0	11.5/26	-3	26 Games
Peacekeeper 3.01	17/25	+9	25 Games
Lizard 10.5	15/24	+6	24 Games
Viridithas 14.0.0	13.5/22	+5	22 Games
RubiChess 20240817	11/20	+2	20 Games
HypnoS 20240727	9/18	+0	18 Games
Clover 7.1 JA	9.5/17	+2	17 Games
Steel Fighter III	8/17	-1	17 Games
Patricia 3.1	13.5/15	+12	15 Games
Vafra 14.12.2 Stockfish	8.5/15	+2	15 Games

Caissa 1.21 download