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Revert "Extend full 3 fold detection to PvNodes"

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This commit is contained in:
Marco Costalba
2013-01-28 17:24:01 +01:00
parent 483c98a69e
commit 58c9fbacc7
3 changed files with 18 additions and 14 deletions
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src/search.cpp
+3 -3
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@@ -534,7 +534,7 @@ namespace {
if (!RootNode)
{
// Step 2. Check for aborted search and immediate draw
if (Signals.stop || pos.is_draw<true, PvNode>() || ss->ply > MAX_PLY)
if (Signals.stop || pos.is_draw<false>() || ss->ply > MAX_PLY)
return DrawValue[pos.side_to_move()];
// Step 3. Mate distance pruning. Even if we mate at the next move our score
@@ -1109,7 +1109,7 @@ split_point_start: // At split points actual search starts from here
ss->ply = (ss-1)->ply + 1;
// Check for an instant draw or maximum ply reached
if (pos.is_draw<false, false>() || ss->ply > MAX_PLY)
if (pos.is_draw<true>() || ss->ply > MAX_PLY)
return DrawValue[pos.side_to_move()];
// Transposition table lookup. At PV nodes, we don't use the TT for
@@ -1516,7 +1516,7 @@ void RootMove::extract_pv_from_tt(Position& pos) {
&& pos.is_pseudo_legal(m = tte->move()) // Local copy, TT could change
&& pos.pl_move_is_legal(m, pos.pinned_pieces())
&& ply < MAX_PLY
&& (!pos.is_draw<true, true>() || ply < 2));
&& (!pos.is_draw<false>() || ply < 2));
pv.push_back(MOVE_NONE); // Must be zero-terminating