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Passed pawns evaluation tweak
Do not penalize if in our adavncing pawn's path there are non-pawns enemy pieces. Especially if they can be attacked by us. Patch is mine, but original idea and also fixing of a first, wrong, version of the patch is from Eelco de Groot. Tests with Joona framework seems to confirm patch is good Results for patch 'disabled' based on 5776 games: Win percentage: 41.309 (+- 0.526) [+- 1.053] Results for patch 'enabled' based on 6400 games: Win percentage: 42.422 (+- 0.500) [+- 1.000] Signed-off-by: Marco Costalba <email@example.com>
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