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Scale down endgames with pawns on one or two adjacent files

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shane31
2014-06-25 16:01:00 -04:00
committed by Gary Linscott
parent ab580106fd
commit 6c9f4cf36f
3 changed files with 32 additions and 23 deletions
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9
src/pawns.cpp
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@@ -204,13 +204,12 @@ namespace {
}
}
b = e->semiopenFiles[Us] ^ 0xFF;
e->pawnSpan[Us] = b ? int(msb(b) - lsb(b)) : 0;
// In endgame it's better to have pawns on both wings. So give a bonus according
// to file distance between left and right outermost pawns.
if (pos.count<PAWN>(Us) > 1)
{
b = e->semiopenFiles[Us] ^ 0xFF;
value += PawnsFileSpan * int(msb(b) - lsb(b));
}
value += PawnsFileSpan * e->pawnSpan[Us];
return value;
}