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Fix isolated and backward pawns scoring

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It is more clear and also more correct because we
consider enemy pawns only in fornt of us and not just
on our file.

Very small functional change, almost not measurable, but
keep the patch for documenting purposes.

Spotted by Marek Kwiatkowski.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-07-17 17:32:54 +01:00
parent 53bbcb78d5
commit 6e06db93fd
1 changed files with 2 additions and 2 deletions
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4
src/pawns.cpp
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@@ -274,7 +274,7 @@ Score PawnInfoTable::evaluate_pawns(const Position& pos, Bitboard ourPawns,
if (isolated) if (isolated)
{ {
value -= IsolatedPawnPenalty[f]; value -= IsolatedPawnPenalty[f];
if (!(theirPawns & file_bb(f))) if (!opposed)
value -= IsolatedPawnPenalty[f] / 2; value -= IsolatedPawnPenalty[f] / 2;
} }
if (doubled) if (doubled)
@@ -283,7 +283,7 @@ Score PawnInfoTable::evaluate_pawns(const Position& pos, Bitboard ourPawns,
if (backward) if (backward)
{ {
value -= BackwardPawnPenalty[f]; value -= BackwardPawnPenalty[f];
if (!(theirPawns & file_bb(f))) if (!opposed)
value -= BackwardPawnPenalty[f] / 2; value -= BackwardPawnPenalty[f] / 2;
} }
if (chain) if (chain)