Crystal is a free, powerful UCI chess engine derived from Stockfish.
Author: Joseph Ellis, Rating CEDR=3750
v.8:
Resolved a couple of minor but longstanding issues.
Adopt SF eval.
Reworked TT damping.
Merged in upstream from Stockfish.
Implemented contempt.
Singular extensions adjustment.
Improved king danger functionality.
Small pruning adjustments.
Bench: 20049890
Crystal 8 - results:
| Opponent | Score | +- | Games |
| Yuli GM Pro 16 | 50/103 | -3 | 103 Games |
| Stockfish 16.1 | 47/96 | -2 | 96 Games |
| Yuliirma 4.0 | 39/81 | -3 | 81 Games |
| Raid 3.6 TR | 37/80 | -6 | 80 Games |
| Cool Iris 12.20 D-3072 | 33.5/68 | -1 | 68 Games |
| Dragon 3.3 | 32.5/58 | +7 | 58 Games |
| Deep Blue 20240315-killer | 25/54 | -4 | 54 Games |
| JigSaw 5.5i | 24.5/54 | -5 | 54 Games |
| AbbyStein 2.8 | 22/44 | +0 | 44 Games |
| Deep Blue 20240518 | 20.5/44 | -3 | 44 Games |
| Tactical Titan | 20/42 | -2 | 42 Games |
| Kookaburra 2.00 | 20/42 | -2 | 42 Games |
| Brainlearn 28 | 18.5/40 | -3 | 40 Games |
| Marauders 3.3i | 18.5/38 | -1 | 38 Games |
| HypnoS 220424 | 17/38 | -4 | 38 Games |
| ShashChess 35.2 | 15/32 | -2 | 32 Games |
| SF-PRO 13.04.2024 | 16/30 | +2 | 30 Games |
| ShashChess 35.3 | 14.5/28 | +1 | 28 Games |
| Brainlearn 28.1 | 12.5/26 | -1 | 26 Games |
| Stockfish 20240421 | 11/26 | -4 | 26 Games |
| HypnoS 160524 | 12/24 | +0 | 24 Games |
| Marauders 3.6 | 11/24 | -2 | 24 Games |
| Berserk 13 | 11.5/22 | +1 | 22 Games |
| CorChess 20240422 | 11/22 | +0 | 22 Games |
| HypnoS legacy 140724 | 10/20 | +0 | 20 Games |
Jim Ablett compiles:
Crystal 8 Dev.82b092c 64 JA - download
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