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Verified SEE pruning for capturing and checking moves.
Patch analyzes field after SEE exchanges concluded with a recapture by the opponent: if opponent Queen/Rook/King results under attack after the exchanges, we consider the move sharp and don't prune it. Important note: By accident I forgot to adjust 'occupied' when the king takes part in the exchanges. As result of this a move is considered sharp too, when opponent king apparently can evade check by recapturing. Surprisingly this seems contribute to patch's strength. STC: https://tests.stockfishchess.org/tests/view/640b16132644b62c33947397 LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 116400 W: 31239 L: 30817 D: 54344 Ptnml(0-2): 350, 12742, 31618, 13116, 374 LTC: https://tests.stockfishchess.org/tests/view/640c88092644b62c3394c1c5 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 177600 W: 47988 L: 47421 D: 82191 Ptnml(0-2): 62, 16905, 54317, 17436, 80 closes #4453 bench: 5012145
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