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Author: Miguel Lahoz
Date: Fri Aug 10 06:16:29 2018 +0200
Timestamp: 1533874589

Remove Condition For Passed Pawns

Currently, we do not consider pawns passed if there is another pawn of
the same color in front of them. It appears that this condition is not
necessary. The idea is that the doubled pawns are likely to be weak and
one of them will be likely captured anyway. On the other hand, if we do
somehow manage to promote a pawn, then the pawn behind it becomes passed
as well. In any case, the end result is we end up with an extra
potentially passed pawn. The current evaluation for passed pawns already
handles this case by also scaling down this effect.

STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 28291 W: 6287 L: 6178 D: 15826 Elo +1.34
http://tests.stockfishchess.org/tests/view/5b6c4b960ebc5902bdb9f256

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 30717 W: 5256 L: 5151 D: 20310 Elo +1.19
http://tests.stockfishchess.org/tests/view/5b6c82980ebc5902bdb9f863

Bench: 4938285