Scale down complexity for almost unwinnable endgames #2298
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bench 3475160
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I fucked up commit (don't have dot before bench) but I wouldn't be able to fix it till evening since I don't have access to my github repo from work. Sorry for inconvenience. |
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I think this could be a powerful idea for refining some parts of the evaluation function, a bit like when we try quadratics or other equations to emphasise certain situations. I have started some tests in this style on kingdanger but I am sure there are other areas that could benefit. |
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Merged via 8aecf26, congrats! I am so happy that we get some initiative() improvement, this will help Stockfish choosing the right endgame when she feels she has a midgame advantage... |
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passed STC
LLR: 2.94 (-2.94,2.94) [0.50,4.50]
Total: 15843 W: 3601 L: 3359 D: 8883
passed LTC
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 121275 W: 20107 L: 19597 D: 81571
This patch greatly scales down complexity of 1 flank endgames where stronger side is not outflanking weaker side and no passed pawns are present.
This should improve stockfish evaluation of obvious 4 vs 3, 3 vs 2 and 2 vs 1 draws in rook/queen/knight/bishop solo flank endgames where strong side can't make progress.
Some other values for this bonus (or overall retuning of complexity) can be done further.
bench 3830387