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Use increased LMR horizont only after a null move

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Revert to LMR horizont of 2 plies. Only if parent move
is a null move increase to 3 so to avoid the bad combination
of null move reduction + LMR reduction. This is a more
aggressive patch then previous one, but it seems we are
going in the wromg direction.

After 531 games result is not good:

Mod vs Orig  +123/=265/-143 48.12%  255.5/531  -13 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-07-15 08:43:09 +01:00
parent 2a203d8d6f
commit fe523b2d18
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1363,7 +1363,7 @@ namespace {
// Try to reduce non-pv search depth by one ply if move seems not problematic,
// if the move fails high will be re-searched at full depth.
if ( depth >= 3*OnePly
if ( depth >= (ss[ply-1].currentMove == MOVE_NULL ? 3 : 2) * OnePly
&& moveCount >= LMRNonPVMoves
&& !dangerous
&& !moveIsCapture