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Allow full repetition detection

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Based on sshivaji 6ee19aa5389ce60181907ba53bbb50642f2d5657 commit
This commit is contained in:
Jean-Francois Romang
2012-10-23 20:33:45 +00:00
parent c1f4000426
commit 0587c5b605
3 changed files with 13 additions and 9 deletions
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src/position.cpp
+9 -5
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@@ -1467,7 +1467,7 @@ Value Position::compute_non_pawn_material(Color c) const {
/// Position::is_draw() tests whether the position is drawn by material,
/// repetition, or the 50 moves rule. It does not detect stalemates, this
/// must be done by the search.
template<bool SkipRepetition>
template<bool SkipRepetition, bool SkipThreeFoldCheck>
bool Position::is_draw() const {
// Draw by material?
@@ -1482,7 +1482,7 @@ bool Position::is_draw() const {
// Draw by repetition?
if (!SkipRepetition)
{
int i = 4, e = std::min(st->rule50, st->pliesFromNull);
int i = 4, e = std::min(st->rule50, st->pliesFromNull), rep_count=0;
if (i <= e)
{
@@ -1492,7 +1492,10 @@ bool Position::is_draw() const {
stp = stp->previous->previous;
if (stp->key == st->key)
return true;
{
if(SkipThreeFoldCheck) return true;
else if(++rep_count>=2) return true;
}
i +=2;
@@ -1504,8 +1507,9 @@ bool Position::is_draw() const {
}
// Explicit template instantiations
template bool Position::is_draw<false>() const;
template bool Position::is_draw<true>() const;
template bool Position::is_draw<false,true>() const;
template bool Position::is_draw<true,true>() const;
template bool Position::is_draw<false,false>() const;
/// Position::flip() flips position with the white and black sides reversed. This