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Introduce pinning bonus

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Add a bonus if a slider is pinning an enemy piece.
Idea from Critter.

After 27443 games at 2"+0.05
Mod vs Orig 5900 - 5518 - 16025 ELO +4 (+- 2.7)

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2012-02-25 12:45:34 +01:00
parent 161c6b025e
commit cf0561d31a
1 changed files with 12 additions and 3 deletions
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15
src/evaluate.cpp
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@ -493,10 +493,8 @@ namespace {
else
assert(false);
// Update attack info
ei.attackedBy[Us][Piece] |= b;
// King attacks
if (b & ei.kingRing[Them])
{
ei.kingAttackersCount[Us]++;
@ -506,12 +504,23 @@ namespace {
ei.kingAdjacentZoneAttacksCount[Us] += popcount<Max15>(bb);
}
// Mobility
mob = (Piece != QUEEN ? popcount<Max15>(b & mobilityArea)
: popcount<Full >(b & mobilityArea));
mobility += MobilityBonus[Piece][mob];
// Add a bonus if a slider is pinning an enemy piece
if ( (Piece == BISHOP || Piece == ROOK || Piece == QUEEN)
&& (PseudoAttacks[Piece][pos.king_square(Them)] & s))
{
b = BetweenBB[s][pos.king_square(Them)] & pos.occupied_squares();
assert(b);
if (!(b & (b - 1)) && (b & pos.pieces(Them)))
score += ThreatBonus[Piece][type_of(pos.piece_on(first_1(b)))] / 2;
}
// Decrease score if we are attacked by an enemy pawn. Remaining part
// of threat evaluation must be done later when we have full attack info.
if (ei.attackedBy[Them][PAWN] & s)