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Be more optimistic in aspiration window

Browse source 
Be more optimistic wrt search instability, and set the unviolated bound
half window.

STC
LLR: 2.96 (-2.94,2.94) [-1.00,4.00]
Total: 16362 W: 3371 L: 3197 D: 9794

LTC
LLR: 2.94 (-2.94,2.94) [0.00,5.00]
Total: 21666 W: 3780 L: 3569 D: 14317

Bench: 6807896

Resolves #105
This commit is contained in:
lucasart 2014-11-08 10:47:56 -05:00 • committed by Gary Linscott
parent 7ebb872409
commit 3d2aab11d8
1 changed files with 5 additions and 1 deletions
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6
src/search.cpp
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@ -322,18 +322,22 @@ namespace {
// re-search, otherwise exit the loop. // re-search, otherwise exit the loop.
if (bestValue <= alpha) if (bestValue <= alpha)
{ {
beta = (alpha + beta) / 2;
alpha = std::max(bestValue - delta, -VALUE_INFINITE); alpha = std::max(bestValue - delta, -VALUE_INFINITE);
Signals.failedLowAtRoot = true; Signals.failedLowAtRoot = true;
Signals.stopOnPonderhit = false; Signals.stopOnPonderhit = false;
} }
else if (bestValue >= beta) else if (bestValue >= beta)
{
alpha = (alpha + beta) / 2;
beta = std::min(bestValue + delta, VALUE_INFINITE); beta = std::min(bestValue + delta, VALUE_INFINITE);
}
else else
break; break;
delta += 3 * delta / 8; delta += delta / 2;
assert(alpha >= -VALUE_INFINITE && beta <= VALUE_INFINITE); assert(alpha >= -VALUE_INFINITE && beta <= VALUE_INFINITE);
} }