Chess engine: Caissa 1.17
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 20240112 | 11/18 | +4 | 18 Games |
Seer 2.8.0 | 9/16 | +2 | 16 Games |
Clover 6.1 | 8.5/15 | +2 | 15 Games |
Chess-System-Tal-2 | 8/15 | +1 | 15 Games |
Texel 1.11 | 9.5/12 | +7 | 12 Games |
Uralochka 3.41.dev1 | 7.5/12 | +3 | 12 Games |
Berserk 12.1 | 6.5/12 | +1 | 12 Games |
Obsidian 10.0 | 6.5/12 | +1 | 12 Games |
Koivisto 9.2 | 6/12 | +0 | 12 Games |
Ethereal 14.25 | 5.5/12 | -1 | 12 Games |
Avalanche 2.1.0 | 7.5/10 | +5 | 10 Games |
Stormphrax 4.0.0 | 6/8 | +4 | 8 Games |
Minic 3.41 | 6/8 | +4 | 8 Games |
Revenge 3.0 | 4.5/8 | +1 | 8 Games |
Minic 3.40 | 5.5/7 | +4 | 7 Games |
Uralochka 3.40a | 5/7 | +3 | 7 Games |
Obsidian 9.0 | 4.5/7 | +2 | 7 Games |
Arasan 24.1 | 4.5/7 | +2 | 7 Games |
Rebel EAS | 3.5/7 | +0 | 7 Games |
Pawn 3.0 | 5/6 | +4 | 6 Games |
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