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Try bad captures before non-captures

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Consider sligtly negative captures as good if at low
depth and far from beta.

After 999 games at 1+0
Mod vs Orig +169 =694 -136  +11 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-02-27 17:09:07 +01:00
parent 68eb7e77f1
commit 14dbeb22dd
3 changed files with 13 additions and 6 deletions
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4
src/movepick.h
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@@ -49,7 +49,7 @@ class MovePicker {
MovePicker& operator=(const MovePicker&); // silence a warning under MSVC
public:
MovePicker(const Position& p, Move ttm, Depth d, const History& h, SearchStack* ss = NULL);
MovePicker(const Position& p, Move ttm, Depth d, const History& h, SearchStack* ss = NULL, Value beta = -VALUE_INFINITE);
Move get_next_move();
int number_of_evasions() const;
@@ -62,7 +62,7 @@ private:
const Position& pos;
const History& H;
MoveStack ttMoves[2], killers[2];
int phase;
int badCaptureThreshold, phase;
const uint8_t* phasePtr;
MoveStack *curMove, *lastMove, *lastGoodNonCapture, *lastBadCapture;
Bitboard pinned;