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Remove useless razoring condition

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STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 20626 W: 3977 L: 3855 D: 12794

LTC:
LLR: 3.10 (-2.94,2.94) [-3.00,1.00]
Total: 87334 W: 13675 L: 13648 D: 60011

Retire also the now unused pawn_on_7th() helper.

bench: 8248166
This commit is contained in:
Marco Costalba 2015-06-30 13:50:59 +02:00
parent aa0dc16b75
commit b2edac7075
3 changed files with 3 additions and 9 deletions
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4
src/movepick.h
View file

@ -32,7 +32,7 @@
/// The Stats struct stores moves statistics. According to the template parameter
/// the class can store History and Countermoves. History records how often
/// different moves have been successful or unsuccessful during the current search
/// and is used for reduction and move ordering decisions.
/// and is used for reduction and move ordering decisions.
/// Countermoves store the move that refute a previous one. Entries are stored
/// using only the moving piece and destination square, hence two moves with
/// different origin but same destination and piece will be considered identical.
@ -54,7 +54,7 @@ struct Stats {
void update(Piece pc, Square to, Value v) {
if (abs(table[pc][to] + v) < Max)
table[pc][to] += v;
table[pc][to] += v;
}
private:

5
src/position.h
View file

@ -141,7 +141,6 @@ public:
// Piece specific
bool pawn_passed(Color c, Square s) const;
bool pawn_on_7th(Color c) const;
bool opposite_bishops() const;
// Doing and undoing moves
@ -366,10 +365,6 @@ inline bool Position::opposite_bishops() const {
&& opposite_colors(pieceList[WHITE][BISHOP][0], pieceList[BLACK][BISHOP][0]);
}
inline bool Position::pawn_on_7th(Color c) const {
return pieces(c, PAWN) & rank_bb(relative_rank(c, RANK_7));
}
inline bool Position::is_chess960() const {
return chess960;
}

3
src/search.cpp
View file

@ -674,8 +674,7 @@ namespace {
if ( !PvNode
&& depth < 4 * ONE_PLY
&& eval + razor_margin(depth) <= alpha
&& ttMove == MOVE_NONE
&& !pos.pawn_on_7th(pos.side_to_move()))
&& ttMove == MOVE_NONE)
{
if ( depth <= ONE_PLY
&& eval + razor_margin(3 * ONE_PLY) <= alpha)