Igel 3.8.0 - new version chess engine

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Igel - UCI chess engine, Rating Chess Engines Diary CEDR=3765
Author : Volodymyr Shcherbyna (Fork of GreKo 2018.01)

Igel, What's new?

implement null move pruning verification search
store probcut result in tt
support systems with small stack size (such as alpine linux)
tune 42 search parameters with spsa (400k games)
implement capture history
cache accumulator
implement adaptive lmr
implement correction history
release new standard network 6b953e78
store static evaluation in tt
fix insufficient material detection
handle en passant in tb root probing
update statistics for tb moves
Regression run against Igel 3.7.0 at Long Time Control (60+0.6)

Elo   | 65.28 +- 4.41 (95%)
Conf  | 60.0+0.60s Threads=1 Hash=64MB
Games | N: 5600 W: 1908 L: 868 D: 2824
Penta | [5, 255, 1249, 1277, 14]
https://chess.grantnet.us/test/40975/
Regression run against Igel 3.7.0 at Short Time Control (10+0.1)

Elo   | 62.51 +- 3.58 (95%)
Conf  | 10.0+0.10s Threads=1 Hash=8MB
Games | N: 10000 W: 3414 L: 1634 D: 4952
Penta | [22, 547, 2163, 2165, 103]
https://chess.grantnet.us/test/40970/

Igel 3.6.0 JA vs other engines

Motor 0.8.0 JA18/46-1046 Games
Velvet 8.1.1 JA18.5/40-340 Games
Clover 8.1 JA17.5/40-540 Games
Integral v614.5/36-736 Games
Caissa 1.2113/36-1036 Games
Revenge 4.016/30+230 Games
Lizard 11.214.5/30-130 Games
Horsie 1.0.6 JA11/26-426 Games
Starzix 6.012/24+024 Games
Uralochka 3.42 dev79.5/20-120 Games
Titan 1.1.09/20-220 Games
Viridithas 16.0.08.5/20-320 Games
Alexandria 7.1.08.5/20-320 Games
Berserk 202411198/20-420 Games
Viridithas 15.0.07.5/20-520 Games
Stormphrax 6.0.07.5/20-520 Games
PlentyChess 4.0.17/20-620 Games
Obsidian 14.23 SE6.5/20-720 Games
Dragon 3.36/20-820 Games
Fire 109.5/16+316 Games
Lizard 11.18/16+016 Games



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