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Minimal thinking time, even if only one rootMove.

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without search, the eval returned can be misleading (e.g. mate instead of draw),
leading to wrong adjudication. With a minimal search, this is avoided.
This patch leads to 1ms long searches if there is only 1 move,
similar patches all indicate a small Elo gain.

Fixes https://github.com/official-stockfish/Stockfish/issues/2707

Passed non-regression STC:
LLR: 2.93 (-2.94,2.94) {-1.50,0.50}
Total: 22312 W: 4350 L: 4204 D: 13758
Ptnml(0-2): 323, 2488, 5437, 2536, 372
https://tests.stockfishchess.org/tests/view/5ed562b0f29b40b0fc95a7d0

closes https://github.com/official-stockfish/Stockfish/pull/2709

Bench: 4733799
This commit is contained in:
Moez Jellouli 2020-05-31 16:51:38 +02:00 • committed by Joost VandeVondele
parent 16566a8fcf
commit 784263596f
1 changed files with 6 additions and 4 deletions
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10
src/search.cpp
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@ -556,9 +556,11 @@ void Thread::search() {
}
double bestMoveInstability = 1 + totBestMoveChanges / Threads.size();
// Stop the search if we have only one legal move, or if available time elapsed
if ( rootMoves.size() == 1
|| Time.elapsed() > Time.optimum() * fallingEval * reduction * bestMoveInstability)
double totalTime = rootMoves.size() == 1 ? 0 :
Time.optimum() * fallingEval * reduction * bestMoveInstability;
// Stop the search if we have exceeded the totalTime, at least 1ms search.
if (Time.elapsed() > totalTime)
{
// If we are allowed to ponder do not stop the search now but
// keep pondering until the GUI sends "ponderhit" or "stop".
@ -569,7 +571,7 @@ void Thread::search() {
}
else if ( Threads.increaseDepth
&& !mainThread->ponder
&& Time.elapsed() > Time.optimum() * fallingEval * reduction * bestMoveInstability * 0.6)
&& Time.elapsed() > totalTime * 0.6)
Threads.increaseDepth = false;
else
Threads.increaseDepth = true;