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Use two counter moves instead of one

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Very good at long 60"+0.05 TC
LLR: 2.95 (-2.94,2.94)
Total: 5954 W: 1151 L: 1016 D: 3787

[edit: slightly changed form original patch to avoid useless loop
 across killers when killer is MOVE_NONE]

bench: 4327405
This commit is contained in:
Joona Kiiski
2013-05-15 20:31:45 +01:00
committed by Marco Costalba
parent 148490f04c
commit f7c013edd0
2 changed files with 27 additions and 7 deletions
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16
src/movepick.h
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@@ -42,10 +42,18 @@ struct Stats {
static const Value Max = Value(2000);
const T* operator[](Piece p) const { return &table[p][0]; }
const T* operator[](Piece p) const { return table[p]; }
void clear() { memset(table, 0, sizeof(table)); }
void update(Piece p, Square to, Move m) { table[p][to] = m; }
void update(Piece p, Square to, Move m) {
if (m == table[p][to].first)
return;
table[p][to].second = table[p][to].first;
table[p][to].first = m;
}
void update(Piece p, Square to, Value v) {
if (Gain)
@@ -61,7 +69,7 @@ private:
typedef Stats< true, Value> GainsStats;
typedef Stats<false, Value> HistoryStats;
typedef Stats<false, Move> CountermovesStats;
typedef Stats<false, std::pair<Move, Move> > CountermovesStats;
/// MovePicker class is used to pick one pseudo legal move at a time from the
@@ -92,7 +100,7 @@ private:
Search::Stack* ss;
Depth depth;
Move ttMove;
MoveStack killers[3];
MoveStack killers[4];
Square recaptureSquare;
int captureThreshold, phase;
MoveStack *cur, *end, *endQuiets, *endBadCaptures;