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Avoid truncated PV in the threaded case

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strongly prefer to pick as bestThread those threads with a longer PV,
among those threads that all found the same bestmove.

extended discussion in #4244
closes https://github.com/official-stockfish/Stockfish/pull/4278

No functional change
This commit is contained in:
mstembera
2022-12-09 18:50:06 -08:00
committed by Joost VandeVondele
parent 955edf1d1d
commit 310928e985
1 changed files with 2 additions and 1 deletions
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3
src/thread.cpp
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@@ -239,7 +239,8 @@ Thread* ThreadPool::get_best_thread() const {
|| ( th->rootMoves[0].score > VALUE_TB_LOSS_IN_MAX_PLY
&& ( votes[th->rootMoves[0].pv[0]] > votes[bestThread->rootMoves[0].pv[0]]
|| ( votes[th->rootMoves[0].pv[0]] == votes[bestThread->rootMoves[0].pv[0]]
&& thread_value(th) > thread_value(bestThread)))))
&& thread_value(th) * int(th->rootMoves[0].pv.size() > 2)
> thread_value(bestThread) * int(bestThread->rootMoves[0].pv.size() > 2)))))
bestThread = th;
return bestThread;