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Added LMR at the root.

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After 2000 games at 1+0

Mod vs Orig +534 =1033 -433 52.525%  1050.5/2000  +18 ELO
This commit is contained in:
Tord Romstad 2009-08-03 09:08:59 +02:00
parent 2f7723fd44
commit dad632ce5b
1 changed files with 24 additions and 8 deletions
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32
src/search.cpp
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@ -858,6 +858,7 @@ namespace {
<< " currmovenumber " << i + 1 << std::endl; << " currmovenumber " << i + 1 << std::endl;
// Decide search depth for this move // Decide search depth for this move
bool moveIsCapture = pos.move_is_capture(move);
bool dangerous; bool dangerous;
ext = extension(pos, move, true, pos.move_is_capture(move), pos.move_is_check(move), false, false, &dangerous); ext = extension(pos, move, true, pos.move_is_capture(move), pos.move_is_check(move), false, false, &dangerous);
newDepth = (Iteration - 2) * OnePly + ext + InitialDepth; newDepth = (Iteration - 2) * OnePly + ext + InitialDepth;
@ -883,15 +884,30 @@ namespace {
} }
else else
{ {
value = -search(pos, ss, -alpha, newDepth, 1, true, 0); if (newDepth >= 3*OnePly
if (value > alpha) && i + MultiPV >= LMRPVMoves
&& !dangerous
&& !moveIsCapture
&& !move_is_promotion(move)
&& !move_is_castle(move))
{ {
// Fail high! Set the boolean variable FailHigh to true, and ss[0].reduction = OnePly;
// re-search the move with a big window. The variable FailHigh is value = -search(pos, ss, -alpha, newDepth-OnePly, 1, true, 0);
// used for time managment: We try to avoid aborting the search }
// prematurely during a fail high research. else
FailHigh = true; value = alpha + 1; // Just to trigger next condition
value = -search_pv(pos, ss, -beta, -alpha, newDepth, 1, 0); if(value > alpha)
{
value = -search(pos, ss, -alpha, newDepth, 1, true, 0);
if (value > alpha)
{
// Fail high! Set the boolean variable FailHigh to true, and
// re-search the move with a big window. The variable FailHigh is
// used for time managment: We try to avoid aborting the search
// prematurely during a fail high research.
FailHigh = true;
value = -search_pv(pos, ss, -beta, -alpha, newDepth, 1, 0);
}
} }
} }