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Do IID also when we already have a ttMove 

In case tte->depth() is far lower the current depth
and we are in a PV node.

Almost 45% of researches give a different ttMove !

After 999 games at 1+0
Mod vs Orig +174 =694 -131 +15 ELO !!!!!!!

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
sf_2.3.1_base
Marco Costalba 2010-05-29 10:01:25 +01:00
parent ec0f0eba6b
commit 2ea323aec6
1 changed files with 2 additions and 2 deletions
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4
src/search.cpp
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@ -1207,8 +1207,8 @@ namespace {
}
// Step 9. Internal iterative deepening
if ( depth >= IIDDepth[PvNode]
&& ttMove == MOVE_NONE
if ( depth >= IIDDepth[PvNode]
&& (ttMove == MOVE_NONE || (PvNode && tte->depth() <= depth - 4 * OnePly))
&& (PvNode || (!isCheck && ss[ply].eval >= beta - IIDMargin)))
{
Depth d = (PvNode ? depth - 2 * OnePly : depth / 2);