Obsidian, an UCI chess engine written in c++
Rating Chess Engines Diary CEDR=3738
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 16.14 vs - other engines:
| Berserk 20250622 | 68/135 | +1 | 135 Partii |
| Stockfish 17.1 | 55/115 | -5 | 115 Partii |
| Integral 7.0.0 JA | 57.5/114 | +1 | 114 Partii |
| Stormphrax 7.0.0 JA | 46.5/84 | +9 | 84 Partii |
| Motor 0.9.0 | 42.5/75 | +10 | 75 Partii |
| Caissa 1.22.1 | 40/75 | +5 | 75 Partii |
| Horsie 1.1.0 | 42.5/73 | +12 | 73 Partii |
| RubiChess 20250606 JA | 32.5/57 | +8 | 57 Partii |
| Alexandria 8.1.0 JA | 28/56 | +0 | 56 Partii |
| PlentyChess 6.0.18 | 27/54 | +0 | 54 Partii |
| SF-PRO2 02.05.2025 | 25/50 | +0 | 50 Partii |
| PlentyChess 6.0.5 JA | 25/48 | +2 | 48 Partii |
| Caissa 1.23 JA | 24/46 | +2 | 46 Partii |
| Reckless 0.8.0 | 23.5/46 | +1 | 46 Partii |
| Alexandria 8.0.0 JA | 23/46 | +0 | 46 Partii |
| Yuliana 7.0 | 21/42 | +0 | 42 Partii |
| Clarity 8.0.0 JA | 27/40 | +14 | 40 Partii |
| Artemis 17TR | 19/38 | +0 | 38 Partii |
| Titan 1.1.0 | 23/36 | +10 | 36 Partii |
| Uralochka 3.42 dev14 | 19/34 | +4 | 34 Partii |
| Dragon 3.3 | 18/34 | +2 | 34 Partii |
| Arasan 25.2 JA | 19/33 | +5 | 33 Partii |
| DarkSeid 6.2 EE | 16/32 | +0 | 32 Partii |
| Viridithas 18.0.0 | 16/30 | +2 | 30 Partii |
| Artemis 17.2TR sl | 15/30 | +0 | 30 Partii |
| Stockfish dev-20250629 | 15/30 | +0 | 30 Partii |
| Kookaburra 3.10 | 14/30 | -2 | 30 Partii |
| Clover 8.2 JA | 17.5/28 | +7 | 28 Partii |
| Viridithas 18.0.0-dev | 15/28 | +2 | 28 Partii |
| Sirius 9.0 | 20.5/26 | +15 | 26 Partii |
| Pawnocchio 1.8 | 19/26 | +12 | 26 Partii |
| Viridithas 18.0.0 JA | 15/26 | +4 | 26 Partii |
| Astra 6.1.1 | 14.5/24 | +5 | 24 Partii |
| Integral 7 dev.322b JA | 12/24 | +0 | 24 Partii |
| PlentyChess 6.0.2 | 12/24 | +0 | 24 Partii |
| Starzix 6.1 JA | 12.5/23 | +2 | 23 Partii |
| Altair 7.2.1 JA | 15/22 | +8 | 22 Partii |
| Uralochka 3.42 dev13 | 13/22 | +4 | 22 Partii |
| Halogen 13.10.0 | 13/22 | +4 | 22 Partii |
| Clover 9.1 JA | 11.5/22 | +1 | 22 Partii |
| Yuliirma 5.0 | 11/22 | +0 | 22 Partii |
| Artemis 17.3TR sl | 10.5/22 | -1 | 22 Partii |
| Pawn 4.0 | 15/20 | +10 | 20 Partii |
Neural network
Obsidian evaluates positions with a neural network trained on Lc0 data.
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