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Don't probe TT at RootNode

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In that case we should also update RootMoveList to avoid
bogus output

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2011-07-29 00:02:50 +03:00 • committed by Marco Costalba
parent 2e2a4b4ea3
commit ce619b3b6c
1 changed files with 4 additions and 3 deletions
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7
src/search.cpp
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@ -770,9 +770,10 @@ namespace {
// At PV nodes we check for exact scores, while at non-PV nodes we check for
// a fail high/low. Biggest advantage at probing at PV nodes is to have a
// smooth experience in analysis mode.
if (tte && (PvNode ? tte->depth() >= depth && tte->type() == VALUE_TYPE_EXACT
: ok_to_use_TT(tte, depth, beta, ss->ply)))
// smooth experience in analysis mode. We don't probe at Root nodes otherwise
// we should also update RootMoveList to avoid bogus output.
if (!RootNode && tte && (PvNode ? tte->depth() >= depth && tte->type() == VALUE_TYPE_EXACT
: ok_to_use_TT(tte, depth, beta, ss->ply)))
{
TT.refresh(tte);
ss->bestMove = ttMove; // Can be MOVE_NONE