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Account for gamePly after each move

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Rename startPosPly to gamePly and increment/decrement
the variable after each do/undo move. This adds a little
overhead in do_move() but we will need to have the
game ply during the search for the next patches now
under test.

Currently we don't increment gamePly in do_null_move()
becuase it is not needed at the moment. Could change
in the future.

As a nice side effect we can now remove an hack in
startpos_ply_counter().

No functional change.
This commit is contained in:
Marco Costalba 2013-02-16 12:42:22 +01:00
parent 5a156df719
commit 76caef8ba1
3 changed files with 13 additions and 11 deletions
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14
src/position.cpp
View file

@ -278,11 +278,11 @@ void Position::set(const string& fenStr, bool isChess960, Thread* th) {
}
// 5-6. Halfmove clock and fullmove number
ss >> std::skipws >> st->rule50 >> startPosPly;
ss >> std::skipws >> st->rule50 >> gamePly;
// Convert from fullmove starting from 1 to ply starting from 0,
// handle also common incorrect FEN with fullmove = 0.
startPosPly = std::max(2 * (startPosPly - 1), 0) + int(sideToMove == BLACK);
gamePly = std::max(2 * (gamePly - 1), 0) + int(sideToMove == BLACK);
st->key = compute_key();
st->pawnKey = compute_pawn_key();
@ -373,7 +373,7 @@ const string Position::fen() const {
ss << '-';
ss << (ep_square() == SQ_NONE ? " - " : " " + square_to_string(ep_square()) + " ")
<< st->rule50 << " " << 1 + (startPosPly - int(sideToMove == BLACK)) / 2;
<< st->rule50 << " " << 1 + (gamePly - int(sideToMove == BLACK)) / 2;
return ss.str();
}
@ -735,8 +735,9 @@ void Position::do_move(Move m, StateInfo& newSt, const CheckInfo& ci, bool moveI
// Update side to move
k ^= Zobrist::side;
// Increment the 50 moves rule draw counter. Resetting it to zero in the
// case of a capture or a pawn move is taken care of later.
// Increment ply counters.In particular rule50 will be later reset it to zero
// in case of a capture or a pawn move.
gamePly++;
st->rule50++;
st->pliesFromNull++;
@ -1054,6 +1055,7 @@ void Position::undo_move(Move m) {
// Finally point our state pointer back to the previous state
st = st->previous;
gamePly--;
assert(pos_is_ok());
}
@ -1417,7 +1419,7 @@ void Position::flip() {
thisThread = pos.this_thread();
nodes = pos.nodes_searched();
chess960 = pos.is_chess960();
startPosPly = pos.startpos_ply_counter();
gamePly = pos.game_ply();
for (Square s = SQ_A1; s <= SQ_H8; s++)
if (!pos.is_empty(s))

8
src/position.h
View file

@ -174,7 +174,7 @@ public:
// Other properties of the position
Color side_to_move() const;
int startpos_ply_counter() const;
int game_ply() const;
bool is_chess960() const;
Thread* this_thread() const;
int64_t nodes_searched() const;
@ -218,7 +218,7 @@ private:
Bitboard castlePath[COLOR_NB][CASTLING_SIDE_NB];
StateInfo startState;
int64_t nodes;
int startPosPly;
int gamePly;
Color sideToMove;
Thread* thisThread;
StateInfo* st;
@ -376,8 +376,8 @@ inline bool Position::is_passed_pawn_push(Move m) const {
&& pawn_is_passed(sideToMove, to_sq(m));
}
inline int Position::startpos_ply_counter() const {
return startPosPly + st->pliesFromNull; // HACK
inline int Position::game_ply() const {
return gamePly;
}
inline bool Position::opposite_bishops() const {

2
src/search.cpp
View file

@ -182,7 +182,7 @@ void Search::think() {
static PolyglotBook book; // Defined static to initialize the PRNG only once
RootColor = RootPos.side_to_move();
TimeMgr.init(Limits, RootPos.startpos_ply_counter(), RootColor);
TimeMgr.init(Limits, RootPos.game_ply(), RootColor);
if (RootMoves.empty())
{