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Code Issues Releases Wiki Activity

Further simplify probe_dtz() loop conditions

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This commit is contained in:
Marco Costalba 2016-05-21 20:19:27 +02:00
parent 6a6a7d2b22
commit 3731213994
1 changed files with 2 additions and 5 deletions
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7
src/syzygy/tbprobe.cpp
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@ -1486,7 +1486,7 @@ int Tablebases::probe_dtz(Position& pos, ProbeState* result)
pos.do_move(move, st, pos.gives_check(move, ci));
if (wdl > WDLDraw)
dtz = -probe_dtz(pos, result);
dtz = -probe_dtz(pos, result) + 1;
else if (st.rule50 > 0) // Not a capture or pawn move
dtz = -probe_dtz(pos, result) - 1;
@ -1502,10 +1502,7 @@ int Tablebases::probe_dtz(Position& pos, ProbeState* result)
if (*result == FAIL)
return 0;
if (wdl > 0 && dtz > 0 && dtz + 1 < minDTZ)
minDTZ = dtz + 1;
else if (wdl < 0 && dtz < minDTZ)
if (dtz < minDTZ && (wdl < WDLDraw || dtz > 1)) // Avoid the case of a draw
minDTZ = dtz;
}