kate/BadFish
1
0
Fork 0
mirror of https://github.com/sockspls/badfish synced 2025-07-11 11:39:15 +00:00
Code Issues Releases Wiki Activity

Minimal thinking time, even if only one rootMove.

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

10
src/search.cpp
View file

@ -556,9 +556,11 @@ void Thread::search() {
} }
double bestMoveInstability = 1 + totBestMoveChanges / Threads.size(); double bestMoveInstability = 1 + totBestMoveChanges / Threads.size();
// Stop the search if we have only one legal move, or if available time elapsed double totalTime = rootMoves.size() == 1 ? 0 :
if ( rootMoves.size() == 1 Time.optimum() * fallingEval * reduction * bestMoveInstability;
|| Time.elapsed() > 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 // If we are allowed to ponder do not stop the search now but
// keep pondering until the GUI sends "ponderhit" or "stop". // keep pondering until the GUI sends "ponderhit" or "stop".
@ -569,7 +571,7 @@ void Thread::search() {
} }
else if ( Threads.increaseDepth else if ( Threads.increaseDepth
&& !mainThread->ponder && !mainThread->ponder
&& Time.elapsed() > Time.optimum() * fallingEval * reduction * bestMoveInstability * 0.6) && Time.elapsed() > totalTime * 0.6)
Threads.increaseDepth = false; Threads.increaseDepth = false;
else else
Threads.increaseDepth = true; Threads.increaseDepth = true;