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Unify Internal iterative deepening

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No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-05-08 12:58:10 +01:00
parent b4870595a5
commit b763b40101
1 changed files with 5 additions and 17 deletions
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22
src/search.cpp
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@ -179,8 +179,7 @@ namespace {
// Step 9. Internal iterative deepening
// Minimum depth for use of internal iterative deepening
const Depth IIDDepthAtPVNodes = 5 * OnePly;
const Depth IIDDepthAtNonPVNodes = 8 * OnePly;
const Depth IIDDepth[2] = { 8 * OnePly /* non-PV */, 5 * OnePly /* PV */};
// At Non-PV nodes we do an internal iterative deepening search
// when the static evaluation is at most IIDMargin below beta.
@ -1197,23 +1196,12 @@ namespace {
}
// Step 9. Internal iterative deepening
// We have different rules for PV nodes and non-pv nodes
if ( PvNode
&& depth >= IIDDepthAtPVNodes
&& ttMove == MOVE_NONE)
{
search<PV>(pos, ss, alpha, beta, depth-2*OnePly, ply, false, threadID);
ttMove = ss[ply].pv[ply];
tte = TT.retrieve(posKey);
}
if ( !PvNode
&& depth >= IIDDepthAtNonPVNodes
if ( depth >= IIDDepth[PvNode]
&& ttMove == MOVE_NONE
&& !isCheck
&& ss[ply].eval >= beta - IIDMargin)
&& (PvNode || (!isCheck && ss[ply].eval >= beta - IIDMargin)))
{
search<NonPV>(pos, ss, alpha, beta, depth/2, ply, false, threadID);
Depth d = (PvNode ? depth - 2 * OnePly : depth / 2);
search<PvNode>(pos, ss, alpha, beta, d, ply, false, threadID);
ttMove = ss[ply].pv[ply];
tte = TT.retrieve(posKey);
}