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IID in pv also when TT move depth is too small

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Try an internal iterative deepening not only when we don't
have a TT move but also if search depth is more then 4*OnePly
higher then TT move depth.

On some tests it seems that in around 20% of cases ttMove changes !

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-11-06 16:08:39 +01:00
parent dae7cacd3b
commit 0fdc75c0bd
1 changed files with 5 additions and 2 deletions
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7
src/search.cpp
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@ -1103,8 +1103,11 @@ namespace {
tte = TT.retrieve(pos.get_key());
ttMove = (tte ? tte->move() : MOVE_NONE);
// Go with internal iterative deepening if we don't have a TT move
if (UseIIDAtPVNodes && ttMove == MOVE_NONE && depth >= 5*OnePly)
// Go with internal iterative deepening if we don't have a TT move or
// if search depth is more then 4*OnePly higher then TT move depth.
if ( UseIIDAtPVNodes
&& depth >= 5*OnePly
&&(!ttMove || depth > tte->depth() + 4*OnePly))
{
search_pv(pos, ss, alpha, beta, depth-2*OnePly, ply, threadID);
ttMove = ss[ply].pv[ply];