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Sync static null conditions with real one

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Almost no functional change, but it seems more
in line with the meaning of static null pruning.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-03-22 08:52:04 +01:00
parent 7dca461927
commit 1fc88071d1
1 changed files with 9 additions and 7 deletions
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14
src/search.cpp
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@ -1368,11 +1368,13 @@ namespace {
// Step 7. Static null move pruning
// We're betting that the opponent doesn't have a move that will reduce
// the score by more than fuility_margin(depth) if we do a null move.
if ( !isCheck
&& allowNullmove
// the score by more than futility_margin(depth) if we do a null move.
if ( allowNullmove
&& depth < RazorDepth
&& refinedValue - futility_margin(depth, 0) >= beta)
&& !isCheck
&& !value_is_mate(beta)
&& ok_to_do_nullmove(pos)
&& refinedValue >= beta + futility_margin(depth, 0))
return refinedValue - futility_margin(depth, 0);
// Step 8. Null move search with verification search
@ -1388,8 +1390,6 @@ namespace {
{
ss[ply].currentMove = MOVE_NULL;
pos.do_null_move(st);
// Null move dynamic reduction based on depth
int R = 3 + (depth >= 5 * OnePly ? depth / 8 : 0);
@ -1397,6 +1397,8 @@ namespace {
if (refinedValue - beta > PawnValueMidgame)
R++;
pos.do_null_move(st);
nullValue = -search(pos, ss, -(beta-1), depth-R*OnePly, ply+1, false, threadID);
pos.undo_null_move();