In TCEC, A0lite inexplicably dropped a queen

dkappe / a0lite

A neural net chess engine in 95 lines of python

MIT License

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In TCEC, A0lite inexplicably dropped a queen #4

Open dkappe opened 4 years ago

dkappe commented 4 years ago

Branch batching-prune

https://tcec-chess.com/#div=ql&game=121&season=19

69... Qd2+ drops a queen and spoils the draw.

message.txt

dkappe commented 4 years ago

2Q2bk1/5p2/4p2B/4P2P/8/1P1q4/K7/8 b - - 10 69

dkappe commented 4 years ago

Unable to reproduce without context:

info string d3d2 12 (P: 0.88%) (Q: -0.4295) info string d3a6 15 (P: 1.18%) (Q: -0.55548) info string d3e2 656 (P: 65.41%) (Q: -0.00541) info string collisions 1493 cache hits 584 nps avg 713.53 info depth 1 seldepth 1 score cp -1 nodes 800 nps 714 pv d3e2 bestmove d3e2

dkappe commented 4 years ago

Even at 20k nodes, no dice.

info string d3d2 12 (P: 0.88%) (Q: -0.4295) info string d3a6 15 (P: 1.18%) (Q: -0.55548) info string g8h7 43 (P: 7.01%) (Q: -0.60166) info string d3e2 19831 (P: 65.41%) (Q: -0.09638) info string collisions 1555 cache hits 18244 nps avg 772.71 info depth 1 seldepth 1 score cp -28 nodes 20000 nps 773 pv d3e2 bestmove d3e2