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Split killer moves from non-captures

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In MovePicker consider killer moves as a separate
phase from non-capture picking.

Note that this change guarantees that killer1 is always
tried before killer2. Until now, because scoring difference
of the two moves was just 1 point, if psqt tables of killer1
gave a lower value then killer2, the latter was tried as first.

After 999 games at 1+0 we have
Mod vs Orig: +245 =527 -227 +6 ELO

Not a lot but patch is anyhow something worth to have.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-05-25 07:49:50 +01:00
parent 1b0888708d
commit bdb1bfecfb
3 changed files with 29 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/movepick.h
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@@ -57,10 +57,9 @@ public:
PH_TT_MOVE, // Transposition table move
PH_MATE_KILLER, // Mate killer from the current ply
PH_GOOD_CAPTURES, // Queen promotions and captures with SEE values >= 0
PH_BAD_CAPTURES, // Queen promotions and captures with SEE values < 0
PH_KILLER_1, // Killer move 1 from the current ply (not used yet).
PH_KILLER_2, // Killer move 2 from the current ply (not used yet).
PH_KILLERS, // Killer moves from the current ply
PH_NONCAPTURES, // Non-captures and underpromotions
PH_BAD_CAPTURES, // Queen promotions and captures with SEE values < 0
PH_EVASIONS, // Check evasions
PH_QCAPTURES, // Captures in quiescence search
PH_QCHECKS, // Non-capture checks in quiescence search
@@ -91,6 +90,7 @@ private:
int phaseIndex;
int numOfMoves, numOfBadCaptures;
int movesPicked;
bool checkKillers, checkLegal;
bool finished;
};