Chess engine: Alexandria 2.4 NNUE

- August 28, 2022

Chess engine: Alexandria

Author: PGG106 Rating CEDR=2907

v.2.4

Featuring better chess than ever

STC:

ELO | 109.76 +- 15.32 (95%)

CONF | 10.0+0.10s Threads=1 Hash=8MB

GAMES | N: 1272 W: 582 L: 193 D: 497

LTC:

ELO | 119.90 +- 23.66 (95%)

CONF | 60.0+0.60s Threads=1 Hash=64MB

GAMES | N: 512 W: 233 L: 63 D: 216

What's Changed

scale nmp reduction factor with depth by @PGG106 in #22

scale nmp reduction linearly by @PGG106 in #23

minor qsearch cleanup by @PGG106 in #24

Probe cleanup by @PGG106 in #25

Probe cleanup2 by @PGG106 in #26

Change default net to a 768->512->1 architecture by @PGG106 in #27

Increase lmr reduction when not improving by @PGG106 in #28

Alexandria 2.4 NNUE download

Individual statistics: Alexandria 2.1.0 - 75 games CEDR (+ 11,= 19,- 45), 27.3 %

Fritz 17 : 6 (+ 0,= 5,- 1), 41.7 %
Stockfish 15 : 6 (+ 0,= 1,- 5), 8.3 %
Fisherov 0.98k : 5 (+ 1,= 0,- 4), 20.0 %
Wasp 5.50 : 1 (+ 0,= 0,- 1), 0.0 %
Arasan 23.3 : 5 (+ 0,= 0,- 5), 0.0 %
Black Marlin 5.0 : 1 (+ 0,= 0,- 1), 0.0 %
ChessKISS 1.8 : 4 (+ 4,= 0,- 0), 100.0 %
Rebel 15x2 : 1 (+ 0,= 0,- 1), 0.0 %
Berserk 9-dev3 : 2 (+ 0,= 0,- 2), 0.0 %
StockfishMZ Iccf 240522 : 4 (+ 0,= 0,- 4), 0.0 %
Fritz 15 : 1 (+ 0,= 0,- 1), 0.0 %
Protej 0.6.3 : 1 (+ 1,= 0,- 0), 100.0 %
Crystal 060622 : 2 (+ 0,= 1,- 1), 25.0 %
Berserk 9 : 2 (+ 0,= 0,- 2), 0.0 %
Journeyman 2.1 : 6 (+ 0,= 5,- 1), 41.7 %
Fisherov chess monk 1.2 : 2 (+ 0,= 0,- 2), 0.0 %
CorChess 210622 : 6 (+ 0,= 0,- 6), 0.0 %
Gargantua 1.0 : 7 (+ 1,= 2,- 4), 28.6 %
Smallbrain 4.0 : 7 (+ 0,= 3,- 4), 21.4 %
Odonata 0.6.2 : 6 (+ 4,= 2,- 0), 83.3 %

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