const char* StartFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
// 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
- // where, due to 50 moves rule, we need to check at most 100 plies back.
- StateInfo StateRingBuf[102], *SetupState = StateRingBuf;
+ // position just before to start searching). Needed by repetition draw detection.
+ Search::StateStackPtr SetupStates;
void set_option(istringstream& up);
void set_position(Position& pos, istringstream& up);
/// that we exit gracefully if the GUI dies unexpectedly. In addition to the UCI
/// commands, the function also supports a few debug commands.
-void uci_loop(const string& args) {
+void UCI::loop(const string& args) {
Position pos(StartFEN, false, Threads.main_thread()); // The root position
string cmd, token;
namespace {
- // set_position() is called when engine receives the "position" UCI
- // command. The function sets up the position described in the given
- // fen string ("fen") or the starting position ("startpos") and then
- // makes the moves given in the following move list ("moves").
+ // set_position() is called when engine receives the "position" UCI command.
+ // The function sets up the position described in the given fen string ("fen")
+ // or the starting position ("startpos") and then makes the moves given in the
+ // following move list ("moves").
void set_position(Position& pos, istringstream& is) {
return;
pos.from_fen(fen, Options["UCI_Chess960"], Threads.main_thread());
+ SetupStates = Search::StateStackPtr(new std::stack<StateInfo>());
// Parse move list (if any)
while (is >> token && (m = move_from_uci(pos, token)) != MOVE_NONE)
{
- pos.do_move(m, *SetupState);
-
- // Increment pointer to StateRingBuf circular buffer
- if (++SetupState - StateRingBuf >= 102)
- SetupState = StateRingBuf;
+ SetupStates->push(StateInfo());
+ pos.do_move(m, SetupStates->top());
}
}
searchMoves.push_back(move_from_uci(pos, token));
}
- Threads.start_searching(pos, limits, searchMoves);
+ Threads.start_searching(pos, limits, searchMoves, SetupStates);
}
}