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Be clear about not LMR the ttMove

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Currently a ttMove is reduced with ss->reduction = DEPTH_ZERO,
so it is actually not reduced (as it should be), but the
trick works just becuase it happens that ttMove is the first
to be tried and

reduction(depth, 1)

Always returns zero. So explicitly forbid reduction of ttMove
in the LMR condition. This is much clear and self-documented.

No functional change.
This commit is contained in:
Marco Costalba 2013-02-03 11:14:21 +01:00
parent 08d615cc95
commit 6560e4cc5b
1 changed files with 4 additions and 2 deletions
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6
src/search.cpp
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@ -400,6 +400,7 @@ namespace {
// Sort the PV lines searched so far and update the GUI
sort<RootMove>(RootMoves.begin(), RootMoves.begin() + PVIdx + 1);
if (PVIdx + 1 == PVSize || Time::now() - SearchTime > 3000)
sync_cout << uci_pv(pos, depth, alpha, beta) << sync_endl;
}
@ -922,8 +923,9 @@ split_point_start: // At split points actual search starts from here
&& !pvMove
&& !captureOrPromotion
&& !dangerous
&& ss->killers[0] != move
&& ss->killers[1] != move)
&& move != ttMove
&& move != ss->killers[0]
&& move != ss->killers[1])
{
ss->reduction = reduction<PvNode>(depth, moveCount);
Depth d = std::max(newDepth - ss->reduction, ONE_PLY);