Chess engine: Alexandria 2.3 NNUE

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July 14, 2022

Chess engine: Alexandria 2.3 NNUE

Chess engine: Alexandria

Author: Normand M. Blais Rating CEDR=2847

v.2.3

this release has some solid (40-50 self-play elo) over 2.2 and most importantly fixes the long standing bug plaguing alexandria long tc performances

T.C of 1+1

Score of Alexandria-new vs Alexandria-2.2: 15 - 1 - 13 [0.741]

... Alexandria-new playing White: 10 - 0 - 5 [0.833] 15

... Alexandria-new playing Black: 5 - 1 - 8 [0.643] 14

... White vs Black: 11 - 5 - 13 [0.603] 29

Elo difference: 183.0 +/- 97.1, LOS: 100.0 %, DrawRatio: 44.8 %

29 of 100 games finished.

What's Changed

Adds Docker Support to Alexandria. by @TheBlackPlague in #4

Add Lichess Dockerfile. by @TheBlackPlague in #5

see move ordering by @PGG106 in #6

Add TT to Qsearch by @PGG106 in #7

tweak history heuristic and move scoring by @PGG106 in #8

Improve history heuristic and add movecount pruning by @PGG106 in #9

Alexandria 2.3 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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