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Fix the pawn hash failure when the pawn key is 0

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This patch fixed bugs #859 and #882.
At initialization we generate a new random key (Zobrist::noPawns).
It's added to the pawn key of all positions, so that the pawn key
of a pawnless position is no longer 0.

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 21307 W: 3738 L: 3618 D: 13951

LTC:
LLR: 2.94 (-2.94,2.94) [-3.00,1.00]
Total: 45270 W: 5737 L: 5648 D: 33885

No functional change.
This commit is contained in:
Aram Tumanian 2016-11-21 17:17:47 +02:00 • committed by Marco Costalba
parent ca464fc89e
commit 9eccba7761
1 changed files with 4 additions and 2 deletions
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6
src/position.cpp
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@ -45,7 +45,7 @@ namespace Zobrist {
Key psq[PIECE_NB][SQUARE_NB];
Key enpassant[FILE_NB];
Key castling[CASTLING_RIGHT_NB];
Key side;
Key side, noPawns;
}
namespace {
@ -145,6 +145,7 @@ void Position::init() {
}
Zobrist::side = rng.rand<Key>();
Zobrist::noPawns = rng.rand<Key>();
}
@ -331,7 +332,8 @@ void Position::set_check_info(StateInfo* si) const {
void Position::set_state(StateInfo* si) const {
si->key = si->pawnKey = si->materialKey = 0;
si->key = si->materialKey = 0;
si->pawnKey = Zobrist::noPawns;
si->nonPawnMaterial[WHITE] = si->nonPawnMaterial[BLACK] = VALUE_ZERO;
si->psq = SCORE_ZERO;
si->checkersBB = attackers_to(square<KING>(sideToMove)) & pieces(~sideToMove);