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Simplification of TM declaration of timeLeft, and improvement of timeleft max() function #5067

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Simplification of TM declaration of timeLeft, and improvement of timeleft max() function #5067

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14 changes: 7 additions & 7 deletions src/timeman.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -82,12 +82,12 @@ void TimeManagement::init(Search::LimitsType& limits,
limits.npmsec = npmsec;
}

// Maximum move horizon of 50 moves
// Maximum and default move horizon of 50 moves
int mtg = limits.movestogo ? std::min(limits.movestogo, 50) : 50;

// Make sure timeLeft is > 0 since we may use it as a divisor
TimePoint timeLeft = std::max(TimePoint(1), limits.time[us] + limits.inc[us] * (mtg - 1)
- moveOverhead * (2 + mtg));
// Make sure timeLeft is > 0 since we use it as a divisor
double timeLeft =
std::max(limits.time[us], limits.time[us] + limits.inc[us] * (mtg - 1) - moveOverhead * mtg);

// Use extra time with larger increments
double optExtra = std::clamp(1.0 + 12.5 * limits.inc[us] / limits.time[us], 1.0, 1.11);
Expand All @@ -97,20 +97,20 @@ void TimeManagement::init(Search::LimitsType& limits,
double maxConstant = std::max(3.4 + 3.0 * std::log10(limits.time[us] / 1000.0), 2.76);

// x basetime (+ z increment)
// If there is a healthy increment, timeLeft can exceed actual available
// If there is a healthy increment and low mtg, timeLeft can exceed actual available
// game time for the current move, so also cap to 20% of available game time.
if (limits.movestogo == 0)
{
optScale = std::min(0.0120 + std::pow(ply + 3.1, 0.44) * optConstant,
0.21 * limits.time[us] / double(timeLeft))
0.21 * limits.time[us] / timeLeft)
* optExtra;
maxScale = std::min(6.9, maxConstant + ply / 12.2);
}

// x moves in y seconds (+ z increment)
else
{
optScale = std::min((0.88 + ply / 116.4) / mtg, 0.88 * limits.time[us] / double(timeLeft));
optScale = std::min((0.88 + ply / 116.4) / mtg, 0.88 * limits.time[us] / timeLeft);
maxScale = std::min(6.3, 1.5 + 0.11 * mtg);
}

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