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File based passed pawn bonus

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Add file based bonus for passed pawns. Values tuned by SPSA.

STC:
LLR: 3.33 (-2.94,2.94) [0.00,5.00]
Total: 36889 W: 6805 L: 6507 D: 23577

LTC:
LLR: 2.97 (-2.94,2.94) [0.00,5.00]
Total: 32301 W: 5101 L: 4858 D: 22342

Bench: 8073614

Resolves #436
This commit is contained in:
Stefan Geschwentner 2015-10-03 03:46:53 -07:00 • committed by Joona Kiiski
parent 9f5b31c21d
commit 83e19fbed5
1 changed files with 7 additions and 1 deletions
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8
src/evaluate.cpp
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@ -170,6 +170,12 @@ namespace {
{ V(7), V(14), V(37), V(63), V(134), V(189) }
};
// PassedFile[File] contains a bonus according to the file of a passed pawn.
const Score PassedFile[] = {
S( 14, 13), S( 2, 5), S(-3, -4), S(-19, -14),
S(-19, -14), S(-3, -4), S( 2, 5), S( 14, 13)
};
const Score ThreatenedByHangingPawn = S(40, 60);
// Assorted bonuses and penalties used by evaluation
@ -652,7 +658,7 @@ namespace {
if (pos.count<PAWN>(Us) < pos.count<PAWN>(Them))
ebonus += ebonus / 4;
score += make_score(mbonus, ebonus);
score += make_score(mbonus, ebonus) + PassedFile[file_of(s)];
}
if (DoTrace)