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Chess engine: Cheng 4.43

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Cheng4 - UCI chess engines, Rating CEDR=3167
Author - Martin Sedlak   

v.4.43:
NN based evaluation (topo 736-192-4-1), goodbye HCE
no incremental inference updates, so a bit slower
custom inference with layer 1 zero skip trick
inverse sigmoid to convert win probability to cp, oscillates a lot with big evals
trained on 1.7M cheng self-play fixed node games, yielding ~125M filtered positions
labeled on 6-ply cheng search and game outcome
includes custom hacky libtorch-based tuner
bench 11152861
dropped support for Windows XP


Cheng 4.41 engine results with other engines:
Tomcat 1.06.5/10+310 Partii
Amoeba 3.45/10+010 Partii
Monolith 25/9+19 Partii
BBC 1.46.5/8+58 Partii
Topple 0.8.14.5/8+18 Partii
Demolito 2021-10-212.5/8-38 Partii
Beef 0.3.60/8-88 Partii
FabChess 1.163.5/7+07 Partii
Godel 7.04/6+26 Partii
Nirvanachess 2.53/6+06 Partii
Deuterium 2019.2.37.733/6+06 Partii
Invictus r3822/6-26 Partii
Combusken 2.0.00.5/6-56 Partii
Coiled 1.10/6-66 Partii
Francesca 0.31a3.5/5+25 Partii
Tantabus 2.0.03.5/4+34 Partii
Gargantua 1.01.5/4-14 Partii
Devre 4.00/4-44 Partii
Rodent NNUE 1.02.5/3+23 Partii
MadChess 3.2 beta2/3+13 Partii
Mittens 0.91.5/3+03 Partii



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