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Simplify failedLow away #1986
FailedLow doesn't seem to add any value so remove it. STC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 43915 W: 9682 L: 9604 D: 24629 http://tests.stockfishchess.org/tests/view/5c5339770ebc592fc7baef74 LTC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 58515 W: 9670 L: 9609 D: 39236 http://tests.stockfishchess.org/tests/view/5c53cc840ebc592fc7baf6c1 Ideas for further work: Tune the values in the revised fallingEval calculation Consider adding a term using delta, e.g. c * (delta - 20) as an indicator of eval instability Bench: 3318033
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1 changed files with 5 additions and 7 deletions
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@ -297,7 +297,6 @@ void Thread::search() {
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MainThread* mainThread = (this == Threads.main() ? Threads.main() : nullptr);
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double timeReduction = 1.0;
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Color us = rootPos.side_to_move();
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bool failedLow;
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std::memset(ss-7, 0, 10 * sizeof(Stack));
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for (int i = 7; i > 0; i--)
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@ -308,7 +307,7 @@ void Thread::search() {
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beta = VALUE_INFINITE;
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if (mainThread)
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mainThread->bestMoveChanges = 0, failedLow = false;
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mainThread->bestMoveChanges = 0;
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size_t multiPV = Options["MultiPV"];
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Skill skill(Options["Skill Level"]);
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@ -349,7 +348,7 @@ void Thread::search() {
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// Age out PV variability metric
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if (mainThread)
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mainThread->bestMoveChanges *= 0.517, failedLow = false;
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mainThread->bestMoveChanges *= 0.517;
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// Save the last iteration's scores before first PV line is searched and
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// all the move scores except the (new) PV are set to -VALUE_INFINITE.
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@ -429,7 +428,6 @@ void Thread::search() {
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if (mainThread)
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{
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failedHighCnt = 0;
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failedLow = true;
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mainThread->stopOnPonderhit = false;
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}
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}
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@ -481,19 +479,19 @@ void Thread::search() {
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&& !Threads.stop
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&& !mainThread->stopOnPonderhit)
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{
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double fallingEval = (306 + 119 * failedLow + 6 * (mainThread->previousScore - bestValue)) / 581.0;
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double fallingEval = (306 + 9 * (mainThread->previousScore - bestValue)) / 581.0;
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fallingEval = std::max(0.5, std::min(1.5, fallingEval));
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// If the bestMove is stable over several iterations, reduce time accordingly
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timeReduction = lastBestMoveDepth + 10 * ONE_PLY < completedDepth ? 1.95 : 1.0;
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double reduction = std::pow(mainThread->previousTimeReduction, 0.528) / timeReduction;
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// Use part of the gained time from a previous stable move for the current move
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double bestMoveInstability = 1.0 + mainThread->bestMoveChanges;
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bestMoveInstability *= std::pow(mainThread->previousTimeReduction, 0.528) / timeReduction;
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// Stop the search if we have only one legal move, or if available time elapsed
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if ( rootMoves.size() == 1
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|| Time.elapsed() > Time.optimum() * bestMoveInstability * fallingEval)
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|| Time.elapsed() > Time.optimum() * fallingEval * reduction * bestMoveInstability)
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{
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// If we are allowed to ponder do not stop the search now but
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// keep pondering until the GUI sends "ponderhit" or "stop".
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