Author: Jost Triller Rating JCER=3249
v.18:
Changes
Fixed issues with positions with more than 256 legal moves
Expanded pawn-relative PSTs to piece-relative PSTs
Added some enemy king context to piece-relative PSTs
Added passed pawns to piece-relative PSTs
More training data
This is probably where the majority of the improvement comes from, going from ~14 million to ~32 million
Removed evaluation features:
mobility
explicit king safety
both bishops
rook on open file
piece attacking other piece + forks
Better aspiration windows
Simplified hash table result handling
Fixed issues with multithreading and race conditions in hash table
98 ±5 Elo in selfplay vs Nalwald 17.1 at 20s+0.3s.
Intel CPUs including and after Haswell (2013) support BMI2 and POPCOUNT
AMD CPUs including and after Zen 1 (2017) support BMI2 and POPCOUNT
Individual statistics: Nalwald 15 - 135 games CEDR (+ 35,= 25,- 75), 35.2 %
Baron 3.44.1 : 4 (+ 1,= 3,- 0), 62.5 %
Ruydos 1.1.11 : 4 (+ 2,= 1,- 1), 62.5 %
Delocto 0.61n : 4 (+ 4,= 0,- 0), 100.0 %
Fridolin 3.10 : 2 (+ 0,= 2,- 0), 50.0 %
ECE 20.1 : 2 (+ 1,= 1,- 0), 75.0 %
Godel 7.0 : 2 (+ 0,= 2,- 0), 50.0 %
Asymptote 0.8 : 2 (+ 1,= 1,- 0), 75.0 %
Kayra 1.3 : 2 (+ 0,= 0,- 2), 0.0 %
Stockfish 15 : 2 (+ 0,= 0,- 2), 0.0 %
Fisherov 0.98k : 4 (+ 0,= 0,- 4), 0.0 %
BrainLearn 17 : 2 (+ 0,= 0,- 2), 0.0 %
Devel 4.0.2.3 : 4 (+ 2,= 2,- 0), 75.0 %
Cheese 3.0.1 : 4 (+ 3,= 1,- 0), 87.5 %
Wasp 5.50 : 2 (+ 0,= 1,- 1), 25.0 %
Komodo 13.02 : 4 (+ 0,= 0,- 4), 0.0 %
Arasan 23.3 : 2 (+ 0,= 0,- 2), 0.0 %
Zahak 10.0 : 2 (+ 0,= 0,- 2), 0.0 %
Hiarcs 15.5 : 2 (+ 0,= 0,- 2), 0.0 %
Protej 0.6.2 : 2 (+ 0,= 1,- 1), 25.0 %
OliThink 5.10.1 : 4 (+ 2,= 1,- 1), 62.5 %
Mantissa 3.3.0 : 2 (+ 0,= 0,- 2), 0.0 %
Caissa 0.5 : 2 (+ 0,= 0,- 2), 0.0 %
Stash 33.0 : 2 (+ 0,= 0,- 2), 0.0 %
Horowitz 2.1 : 2 (+ 2,= 0,- 0), 100.0 %
Rebel 15x2 : 2 (+ 0,= 0,- 2), 0.0 %
Minic 3.19 : 2 (+ 0,= 0,- 2), 0.0 %
StockfishMZ 170522 : 2 (+ 0,= 0,- 2), 0.0 %
ProteusSF RBE 008 : 2 (+ 0,= 0,- 2), 0.0 %
Coiled 1.1 : 2 (+ 0,= 0,- 2), 0.0 %
Devre 2.0 : 4 (+ 0,= 2,- 2), 25.0 %
Dumb 1.9 : 4 (+ 3,= 1,- 0), 87.5 %
Vafra 3.3.1 : 2 (+ 1,= 1,- 0), 75.0 %
Mayhem 7.2 : 2 (+ 2,= 0,- 0), 100.0 %
Benjamin 1.1 : 4 (+ 2,= 1,- 1), 62.5 %
NiCim 3.4 : 2 (+ 1,= 0,- 1), 50.0 %
Colossus 2022a : 2 (+ 2,= 0,- 0), 100.0 %
Bagatur 3.3 : 4 (+ 4,= 0,- 0), 100.0 %
Vafra 3.3.2 : 4 (+ 0,= 2,- 2), 25.0 %
Koivisto 8.8 : 2 (+ 0,= 0,- 2), 0.0 %
Kayra 1.4 : 2 (+ 0,= 0,- 2), 0.0 %
Deep Shredder 13 : 2 (+ 0,= 0,- 2), 0.0 %
Fritz 15 : 2 (+ 0,= 1,- 1), 25.0 %
Igel 3.1.0 : 2 (+ 0,= 0,- 2), 0.0 %
Halogen 10.22 : 2 (+ 0,= 0,- 2), 0.0 %
Minic 3.22 : 2 (+ 0,= 0,- 2), 0.0 %
Blue Marlin 15.2a : 2 (+ 0,= 0,- 2), 0.0 %
Koivisto 8.13 : 2 (+ 0,= 0,- 2), 0.0 %
Marvin 6.0.0 : 2 (+ 0,= 0,- 2), 0.0 %
Protej 0.6.3 : 1 (+ 1,= 0,- 0), 100.0 %
Stockfish 070622 : 2 (+ 0,= 0,- 2), 0.0 %
Knightx 3.3 : 2 (+ 1,= 0,- 1), 50.0 %
CorChess 080622 : 2 (+ 0,= 0,- 2), 0.0 %
Crystal 060622 : 2 (+ 0,= 0,- 2), 0.0 %
EMAN 8.03 : 2 (+ 0,= 0,- 2), 0.0 %
NiCim 3.4.1 : 2 (+ 0,= 1,- 1), 25.0 %
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