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Fix startpos_ply_counter() regression

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Return the correct number of played plies at the end
of the setup moves. Currently it always returns 0 when
starting from start position, like in real games.

We fix this adding st->pliesFromNull that starts from 0
and is incremented after each setup move and is never
reset in the setup phase but only once search is started.

It is an hack because startpos_ply_counter() will return
different values during the search and is correct only
at the beginning of the search.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-07-24 05:59:16 +01:00
parent 5f7eb20090
commit fc290dc30b
2 changed files with 2 additions and 2 deletions
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2
src/position.h
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@ -423,7 +423,7 @@ inline bool Position::move_is_passed_pawn_push(Move m) const {
} }
inline int Position::startpos_ply_counter() const { inline int Position::startpos_ply_counter() const {
return startPosPly; return startPosPly + st->pliesFromNull; // HACK
} }
inline bool Position::opposite_colored_bishops() const { inline bool Position::opposite_colored_bishops() const {

2
src/uci.cpp
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@ -39,7 +39,7 @@ namespace {
// Keep track of position keys along the setup moves (from start position to the // Keep track of position keys along the setup moves (from start position to the
// position just before to start searching). This is needed by draw detection // position just before to start searching). This is needed by draw detection
// where, due to 50 moves rule, we need to ckeck at most 100 plies back. // where, due to 50 moves rule, we need to check at most 100 plies back.
StateInfo StateRingBuf[102], *SetupState = StateRingBuf; StateInfo StateRingBuf[102], *SetupState = StateRingBuf;
// UCIParser is a class for parsing UCI input. The class // UCIParser is a class for parsing UCI input. The class