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Change exclusion key setup

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Should depend on which move is excluded. This
allow us to remove the dedicated Position::exclusion_key().

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 59814 W: 11136 L: 11083 D: 37595

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 31023 W: 4187 L: 4080 D: 22756

bench 7553379
This commit is contained in:
lucasart
2016-08-30 20:27:05 +08:00
committed by Marco Costalba
parent 7f2eb10e93
commit 13b4444d9e
3 changed files with 1 additions and 6 deletions
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4
src/position.cpp
View File

@@ -40,11 +40,8 @@ namespace Zobrist {
Key enpassant[FILE_NB]; Key enpassant[FILE_NB];
Key castling[CASTLING_RIGHT_NB]; Key castling[CASTLING_RIGHT_NB];
Key side; Key side;
Key exclusion;
} }
Key Position::exclusion_key() const { return st->key ^ Zobrist::exclusion; }
namespace { namespace {
const string PieceToChar(" PNBRQK pnbrqk"); const string PieceToChar(" PNBRQK pnbrqk");
@@ -132,7 +129,6 @@ void Position::init() {
} }
Zobrist::side = rng.rand<Key>(); Zobrist::side = rng.rand<Key>();
Zobrist::exclusion = rng.rand<Key>();
} }

1
src/position.h
View File

@@ -150,7 +150,6 @@ public:
// Accessing hash keys // Accessing hash keys
Key key() const; Key key() const;
Key key_after(Move m) const; Key key_after(Move m) const;
Key exclusion_key() const;
Key material_key() const; Key material_key() const;
Key pawn_key() const; Key pawn_key() const;

2
src/search.cpp
View File

@@ -622,7 +622,7 @@ namespace {
// search to overwrite a previous full search TT value, so we use a different // search to overwrite a previous full search TT value, so we use a different
// position key in case of an excluded move. // position key in case of an excluded move.
excludedMove = ss->excludedMove; excludedMove = ss->excludedMove;
posKey = excludedMove ? pos.exclusion_key() : pos.key(); posKey = pos.key() ^ Key(excludedMove);
tte = TT.probe(posKey, ttHit); tte = TT.probe(posKey, ttHit);
ttValue = ttHit ? value_from_tt(tte->value(), ss->ply) : VALUE_NONE; ttValue = ttHit ? value_from_tt(tte->value(), ss->ply) : VALUE_NONE;
ttMove = rootNode ? thisThread->rootMoves[thisThread->PVIdx].pv[0] ttMove = rootNode ? thisThread->rootMoves[thisThread->PVIdx].pv[0]