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Reduce big time spikes by reducing PV re-searches.

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Save time by reducing PV re-searches above original depth. Instead use 5% extra time on every move.

STC 10+0.1 th 1 :
LLR: 2.93 (-2.94,2.94) {-0.25,1.25}
Total: 90688 W: 9702 L: 9436 D: 71550
Ptnml(0-2): 408, 7252, 29792, 7450, 442
https://tests.stockfishchess.org/tests/view/5f8df807bacb75a4f9a47223

LTC 60+0.6 th 1 :
LLR: 2.97 (-2.94,2.94) {0.25,1.25}
Total: 97856 W: 4602 L: 4303 D: 88951
Ptnml(0-2): 53, 3757, 41057, 3960, 101
https://tests.stockfishchess.org/tests/view/5f8ec4872c92c7fe3a8c602d

closes https://github.com/official-stockfish/Stockfish/pull/3192

Bench 3943959
This commit is contained in:
xoto10 2020-10-21 14:52:13 +01:00 • committed by Joost VandeVondele
parent 560c776397
commit f5dfad5d72
2 changed files with 4 additions and 2 deletions
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4
src/search.cpp
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@ -565,6 +565,7 @@ namespace {
constexpr bool PvNode = NT == PV;
const bool rootNode = PvNode && ss->ply == 0;
const Depth maxNextDepth = rootNode ? depth : depth + 1;
// Check if we have an upcoming move which draws by repetition, or
// if the opponent had an alternative move earlier to this position.
@ -1259,7 +1260,8 @@ moves_loop: // When in check, search starts from here
(ss+1)->pv = pv;
(ss+1)->pv[0] = MOVE_NONE;
value = -search<PV>(pos, ss+1, -beta, -alpha, newDepth, false);
value = -search<PV>(pos, ss+1, -beta, -alpha,
std::min(maxNextDepth, newDepth), false);
}
// Step 18. Undo move

2
src/timeman.cpp
View file

@ -75,7 +75,7 @@ void TimeManagement::init(Search::LimitsType& limits, Color us, int ply) {
// game time for the current move, so also cap to 20% of available game time.
if (limits.movestogo == 0)
{
optScale = std::min(0.008 + std::pow(ply + 3.0, 0.5) / 250.0,
optScale = std::min(0.0084 + std::pow(ply + 3.0, 0.5) * 0.0042,
0.2 * limits.time[us] / double(timeLeft));
maxScale = std::min(7.0, 4.0 + ply / 12.0);
}