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Bonus for file distance of the outermost pawns

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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.

Passed both short TC
LLR: 2.97 (-2.94,2.94) [-1.50,4.50]
Total: 39073 W: 7749 L: 7536 D: 23788

And long TC
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 6149 W: 1040 L: 910 D: 4199

bench: 7665034
This commit is contained in:
Stefan Geschwentner 2013-12-24 23:37:34 +01:00 • committed by Marco Costalba
parent 899a2c033e
commit cf0a2a26a9
1 changed files with 11 additions and 0 deletions
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11
src/pawns.cpp
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@ -57,6 +57,9 @@ namespace {
S( 0, 0), S( 6, 13), S(6,13), S(14,29),
S(34,68), S(83,166), S(0, 0), S( 0, 0) };
// Bonus for file distance of the two outermost pawns
const Score PawnsFileSpan = S(0, 10);
// Weakness of our pawn shelter in front of the king indexed by [rank]
const Value ShelterWeakness[RANK_NB] =
{ V(100), V(0), V(27), V(73), V(92), V(101), V(101) };
@ -181,6 +184,14 @@ namespace {
}
}
// 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));
}
return value;
}