Obsidian, an UCI chess engine written in c++
Rating Chess Engines Diary CEDR=3740
v.16:
This new version includes a few search patches and a new NNUE architecture, finally with layers.
I dropped support for pre-AVX2, but I might add it back if requested to.
For testers: if you tested 14.24, don't test 15.0, they are exactly the same.
Obsidian 15.0 vs 14.0 (LTC)
Elo | 27.21 +- 4.01 (95%)
Conf | 40.0+0.40s Threads=1 Hash=128MB
Games | N: 7012 W: 2009 L: 1461 D: 3542
Penta | [7, 576, 1796, 1116, 11]
Obsidian 16.08 vs - other engines:
| RubiChess 20250606 JA | 19.5/37 | +2 | 37 Partii |
| Berserk 20250606 | 15/29 | +1 | 29 Partii |
| Clover 8.1.16 | 14.5/24 | +5 | 24 Partii |
| Fritz 20 | 14/22 | +6 | 22 Partii |
| Fire 9.3 JA | 15.5/21 | +10 | 21 Partii |
| Horsie 1.1.0 | 12/20 | +4 | 20 Partii |
| Caissa 1.22 JA | 11/20 | +2 | 20 Partii |
| Motor 0.9.0 | 11/20 | +2 | 20 Partii |
| Starzix 6.1 JA | 11/20 | +2 | 20 Partii |
| Integral 7.0.0 JA | 10.5/20 | +1 | 20 Partii |
| PlentyChess 6.0.0 JA | 10.5/20 | +1 | 20 Partii |
| Alexandria 8.0.0 JA | 10/20 | +0 | 20 Partii |
| BlackFish 270525 | 7.5/15 | +0 | 15 Partii |
| Halogen 13.0.1 | 9/12 | +6 | 12 Partii |
| Stormphrax 7.0.0 | 7/12 | +2 | 12 Partii |
| Stockfish 17.1 | 6/12 | +0 | 12 Partii |
| Mayhem 8.8 JA | 10.5/11 | +10 | 11 Partii |
| Pawnocchio 1.7.2 | 7.5/11 | +4 | 11 Partii |
| Stormphrax | 7/10 | +4 | 10 Partii |
| PlentyChess 6.0.5 JA | 5/10 | +0 | 10 Partii |
| Alexandria 8.0.0 | 5/10 | +0 | 10 Partii |
Neural network
Obsidian evaluates positions with a neural network trained on Lc0 data.
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