Crystal is a free, powerful UCI chess engine derived from Stockfish.
Author: Joseph Ellis, Rating CEDR=3725
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 7 CMB Ipman - results:
| Caissa 1.14.1 | 16/24 | +8 | 24 Games |
| Cool Iris 11.50 | 11/22 | +0 | 22 Games |
| Stockfish 20231107 | 10/22 | -2 | 22 Games |
| Fire 9.2 | 16.5/20 | +13 | 20 Games |
| Berserk 12.1 | 11/20 | +2 | 20 Games |
| Sawfish 1.0 | 10/20 | +0 | 20 Games |
| ShashChess 34.3 | 10/20 | +0 | 20 Games |
| TACTICAL 171123 | 10/20 | +0 | 20 Games |
| Peacekeeper 2.10 | 16/18 | +14 | 18 Games |
| Yuliirma 3.0 | 8.5/18 | -1 | 18 Games |
| Protej 20231108c | 15.5/16 | +15 | 16 Games |
| Raid 3 | 8/16 | +0 | 16 Games |
| AbbyStein 2.8 | 8/16 | +0 | 16 Games |
| Fisherov chess monk 1.2 | 8/16 | +0 | 16 Games |
| Stockfish 15.1 | 8/16 | +0 | 16 Games |
| Stockfish 20231111 Ivec | 8/16 | +0 | 16 Games |
| Adachess 4.0 | 14/14 | +14 | 14 Games |
| Sting Black Hole 7 | 13.5/14 | +13 | 14 Games |
| Lynx 1.0.0 | 12/12 | +12 | 12 Games |
| Lux 4.0 | 11.5/12 | +11 | 12 Games |
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