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Simplify time management and fix 'ponder on' bug

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Simplify time management code by removing hard stops for unchanging first root moves.
Search is now stopped earlier at the end iteration if it did not have fail-lows at root.

This simplification also fixes pondering bug. Ponder flag was true by default
and cutechess-cli doesn't change it to false even though no pondering is possible.
Fix the issue by setting the default value of 'Ponder' flag to false.

10+0.1:
ELO: 3.51 +-3.0 (95%) LOS: 99.0%
Total: 20000 W: 3898 L: 3696 D: 12406

40+0.4:
ELO: 1.39 +-2.7 (95%) LOS: 84.7%
Total: 20000 W: 3104 L: 3024 D: 13872

60+0.06:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 37231 W: 5333 L: 5236 D: 26662

Stopped run at 100+1:
LLR: 1.09 (-2.94,2.94) [-3.00,1.00]
Total: 37253 W: 4862 L: 4856 D: 27535

Resolves #523
Fixes #510
This commit is contained in:
Leonid Pechenik
2015-12-09 02:07:34 -05:00
committed by Joona Kiiski
parent 7904a7d930
commit 69240a982d
6 changed files with 25 additions and 41 deletions
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12
src/timeman.cpp
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@@ -32,8 +32,8 @@ namespace {
enum TimeType { OptimumTime, MaxTime };
const int MoveHorizon = 50; // Plan time management at most this many moves ahead
const double MaxRatio = 7.0; // When in trouble, we can step over reserved time with this ratio
const double StealRatio = 0.33; // However we must not steal time from remaining moves over this ratio
const double MaxRatio = 6.93; // When in trouble, we can step over reserved time with this ratio
const double StealRatio = 0.36; // However we must not steal time from remaining moves over this ratio
// move_importance() is a skew-logistic function based on naive statistical
@@ -43,9 +43,9 @@ namespace {
double move_importance(int ply) {
const double XScale = 9.3;
const double XShift = 59.8;
const double Skew = 0.172;
const double XScale = 8.27;
const double XShift = 59.;
const double Skew = 0.179;
return pow((1 + exp((ply - XShift) / XScale)), -Skew) + DBL_MIN; // Ensure non-zero
}
@@ -129,6 +129,4 @@ void TimeManagement::init(Search::LimitsType& limits, Color us, int ply)
if (Options["Ponder"])
optimumTime += optimumTime / 4;
optimumTime = std::min(optimumTime, maximumTime);
}