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Chess engine: Arcanum 2.1 NNUE

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Arcanum is a free UCI chess engine under the MIT license. 
Rating Chess Engines Diary CEDR=2922

v.2.1:
Changes
Use vertically symmetric mirroring for feature indices in the NNUE.
Fix an issue with the NNUE backpropagation, where the WDL result target for black was not set correctly.
A new NNUE net trained with the changes above.
The v1 net from Arcanum 2.0 and v2 net from Arcanum 2.1 is thus not interchangeable
Added reporting of seldepth in uci.
Small rework of time management to use more time early, and be more conservative in the endgame.
Added MoveOverhead UCI option, to enable adding a millisecond margin to the time usage. Default is 10ms.
Fix an issue where a null move was returned by search if it did not have enough time to search any moves.
Arcanum is now forced to return a legal move
Other bugfixes to enable compiling and running on Linux.
Elo estimates
Arcanum 2.1 is estimated to be ~200 Elo stronger than Arcanum 2.0. See results below

Self play
Time control: 10s + 0.1s
Score of v2.1 vs v2.0: 141 - 16 - 43 (Win - Loss - Draw)
v2.1 playing White: 70 - 9 - 21
v2.1 playing Black: 71 - 7 - 22
Elo difference: 254.7 +/- 50.3, LOS: 100.0 %, DrawRatio: 21.5 %

Time control: 60s + 0.5s
Score of v2.1 vs v2.0: 125 - 21 - 54 (Win - Loss - Draw)
v2.1 playing White: 64 - 14 - 22
v2.1 playing Black: 61 - 7 - 32
Elo difference: 200.2 +/- 45.1, LOS: 100.0 %, DrawRatio: 27.0 %


Arcanum 1.11.1 - results
Lambergar 0.3.1c13/16+1016 Games
Lynx 1.0.19.5/14+514 Games
Protej 20231118d9.5/14+514 Games
Kuma 1.23.5/14-714 Games
Freda 0.9913/13+1313 Games
Adachess 4.012/12+1212 Games
Z5 3.01/12-1012 Games
Dragon free0.5/12-1112 Games
Eubos 2.2510/10+1010 Games
Lux 4.08/10+610 Games
Reckless 0.3.06.5/10+310 Games
Critter 1.6a4/10-210 Games
RukChess 3.0.172/10-610 Games
Carp 3.0.10.5/10-910 Games
Pawn 2.00/10-1010 Games
SF-PRO 19.11.20230.5/4-34 Games
Incognito 40.5/4-34 Games
Stockfish 202311200/4-44 Games
Raid 3.10/4-44 Games
Polyfish 2311200/4-44 Games
Patzer AI X-2560/4-44 Games

 


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