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Code Issues Releases Wiki Activity

New voting formula for threads

Browse source 
We now use a quadratic formula during the vote for threads
when deciding on which thread to pick a move from.

time control 5+0.05, with 8 threads:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 20202 W: 4031 L: 3813 D: 12358
http://tests.stockfishchess.org/tests/view/5c16c8e60ebc5902ba1223e2

time control 20+0.2, with 8 threads:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 14330 W: 2290 L: 2115 D: 9925
http://tests.stockfishchess.org/tests/view/5c16efca0ebc5902ba122993

20000 games match at time control 5+0.05, with 31 threads:
ELO: 5.63 +-2.8 (95%) LOS: 100.0%
Total: 20000 W: 3539 L: 3215 D: 13246
http://tests.stockfishchess.org/tests/view/5c16f07a0ebc5902ba122a20

Closes https://github.com/official-stockfish/Stockfish/pull/1876

No functional change (in simple thread mode)
This commit is contained in:
mstembera 2018-12-18 08:50:57 +01:00 • committed by Stéphane Nicolet
parent 7240a90bf9
commit 67ae53b020
1 changed files with 5 additions and 4 deletions
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9
src/search.cpp
View file

@ -254,7 +254,7 @@ void MainThread::search() {
&& !Skill(Options["Skill Level"]).enabled()
&& rootMoves[0].pv[0] != MOVE_NONE)
{
std::map<Move, int> votes;
std::map<Move, int64_t> votes;
Value minScore = this->rootMoves[0].score;
// Find out minimum score and reset votes for moves which can be voted
@ -265,12 +265,13 @@ void MainThread::search() {
}
// Vote according to score and depth
auto square = [](int64_t x) { return x * x; };
for (Thread* th : Threads)
votes[th->rootMoves[0].pv[0]] += int(th->rootMoves[0].score - minScore)
+ int(th->completedDepth);
votes[th->rootMoves[0].pv[0]] += 200 + (square(th->rootMoves[0].score - minScore + 1)
* int64_t(th->completedDepth));
// Select best thread
int bestVote = votes[this->rootMoves[0].pv[0]];
int64_t bestVote = votes[this->rootMoves[0].pv[0]];
for (Thread* th : Threads)
{
if (votes[th->rootMoves[0].pv[0]] > bestVote)