DoubleCheck 2.5.4
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- bugfix: free passer bonus was attributed when pieces were in the way, i/o the opposite.
- bugfix: relative king distance was too preponderant in the passed pawn scoring.
- bugfix: KRRBKRR was incorrectly recognized as a draw.

DoubleCheck 2.5.3
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- move_ok: rewritten efficiently (first step to prepare the lazy move ordering).
- rook and bishop promotions can be disabled (in search, not perft) with SubPromotions in movegen.c
- gen_msl: precalculate SEE only for captures.

DoubleCheck 2.5.2
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- eval: removed candidate passed pawns.
- eval: reduced penalty when a passed pawn is not part of a pawn chain.

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