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Fixed UCI TB win values

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This patch results in search values for a TB win/loss to be reported in a way that does not change with normalization, i.e. will be consistent over time.

A value of 200.00 pawns is now reported upon entering a TB won position. Values smaller than 200.00 relate to the distance in plies from the root to the probed position position,
with 1 cp being 1 ply distance.

closes https://github.com/official-stockfish/Stockfish/pull/4353

No functional change
This commit is contained in:
disservin 2023-01-23 19:32:26 +01:00 • committed by Joost VandeVondele
parent d3860f8d5e
commit def296670d
1 changed files with 6 additions and 1 deletions
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7
src/uci.cpp
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@ -314,8 +314,13 @@ string UCI::value(Value v) {
stringstream ss;
if (abs(v) < VALUE_MATE_IN_MAX_PLY)
if (abs(v) < VALUE_TB_WIN_IN_MAX_PLY)
ss << "cp " << v * 100 / NormalizeToPawnValue;
else if (abs(v) < VALUE_MATE_IN_MAX_PLY)
{
const int ply = VALUE_MATE_IN_MAX_PLY - 1 - std::abs(v); // recompute ss->ply
ss << "cp " << (v > 0 ? 20000 - ply : -20000 + ply);
}
else
ss << "mate " << (v > 0 ? VALUE_MATE - v + 1 : -VALUE_MATE - v) / 2;