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Chess engine: Caissa 1.17

on


Caissa - UCI chess engine,  Author: Michał Witanowski
Rating CEDR=3655

v.1.17:
Progression test
TC=8+0.08, Book=UHO_Lichess_4852_v1.epd

Elo   | 20.60 +- 4.85 (95%)
Conf  | 8.0+0.08s Threads=1 Hash=8MB
Games | N: 9690 W: 2670 L: 2096 D: 4924
Penta | [38, 947, 2337, 1449, 74]
TC=60+0.6, Book=UHO_Lichess_4852_v1.epd

Elo   | 19.83 +- 6.47 (95%)
Conf  | 60.0+0.60s Threads=1 Hash=64MB
Games | N: 5000 W: 1272 L: 987 D: 2741
Penta | [4, 442, 1332, 709, 13]
TC=8+0.08, Book=DFRC.epd

Elo   | 15.59 +- 6.38 (95%)
Conf  | 8.0+0.08s Threads=1 Hash=8MB
Games | N: 4394 W: 948 L: 751 D: 2695
Penta | [28, 433, 1110, 566, 60]
Changes
New neural net trained on total 7.1B positions. Introduced more high quality games from SPRT tests to the dataset (~220M positions) and random endgame positions scored with 7-man TB (~40M positions). Finetuning previous net for over 50B iterations.
Small speedup
Search improvements:
Prevent search explosions in LMR
Simplify LMR history formula
Additional history bonus based on score difference
Store eval in TT as soon as possible
Higher RFP margin if opponent is threating a capture
Use threats info to generate less illegal king moves
Tweak transposition table replacement scheme

Caissa 1.16 - results:
RubiChess 2024011211/18+418 Games
Seer 2.8.09/16+216 Games
Clover 6.18.5/15+215 Games
Chess-System-Tal-28/15+115 Games
Texel 1.119.5/12+712 Games
Uralochka 3.41.dev17.5/12+312 Games
Berserk 12.16.5/12+112 Games
Obsidian 10.06.5/12+112 Games
Koivisto 9.26/12+012 Games
Ethereal 14.255.5/12-112 Games
Avalanche 2.1.07.5/10+510 Games
Stormphrax 4.0.06/8+48 Games
Minic 3.416/8+48 Games
Revenge 3.04.5/8+18 Games
Minic 3.405.5/7+47 Games
Uralochka 3.40a5/7+37 Games
Obsidian 9.04.5/7+27 Games
Arasan 24.14.5/7+27 Games
Rebel EAS3.5/7+07 Games
Pawn 3.05/6+46 Games





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