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Remove bishop pin bonus

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Shows no regression at LTC after 20K games:

ELO: 0.03 +-2.7 (95%) LOS: 51.0%
Total: 20608 W: 3252 L: 3250 D: 14106

bench: 7516178
This commit is contained in:
Gary Linscott 2013-12-27 17:12:08 -05:00 • committed by Marco Costalba
parent 71440cf77b
commit 9b1d594456
1 changed files with 0 additions and 8 deletions
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8
src/evaluate.cpp
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@ -163,7 +163,6 @@ namespace {
#undef S
const Score Tempo = make_score(24, 11);
const Score BishopPin = make_score(66, 11);
const Score RookOn7th = make_score(11, 20);
const Score QueenOn7th = make_score( 3, 8);
const Score RookOnPawn = make_score(10, 28);
@ -501,13 +500,6 @@ Value do_evaluate(const Position& pos) {
if (ei.attackedBy[Them][PAWN] & s)
score -= ThreatenedByPawn[Piece];
// Otherwise give a bonus if we are a bishop and can pin a piece or can
// give a discovered check through an x-ray attack.
else if ( Piece == BISHOP
&& (PseudoAttacks[Piece][pos.king_square(Them)] & s)
&& !more_than_one(BetweenBB[s][pos.king_square(Them)] & pos.pieces()))
score += BishopPin;
// Penalty for bishop with same coloured pawns
if (Piece == BISHOP)
score -= BishopPawns * ei.pi->pawns_on_same_color_squares(Us, s);