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namespace {
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namespace {
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  // FEN string of the initial position, normal chess
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  // FEN string of the initial position, normal chess
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  const char* StartFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
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  const char* StartFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
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  // Stack to keep track of the position states along the setup moves (from the
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  // A list to keep track of the position states along the setup moves (from the
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  // start position to the position just before the search starts). Needed by
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  // start position to the position just before the search starts). Needed by
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  // 'draw by repetition' detection.
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  // 'draw by repetition' detection.
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  Search::StateStackPtr SetupStates;
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  StateListPtr States(new std::deque<StateInfo>(1));
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  // position() is called when engine receives the "position" UCI command.
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  // position() is called when engine receives the "position" UCI command.
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  // The function sets up the position described in the given FEN string ("fen")
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  // The function sets up the position described in the given FEN string ("fen")
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  // or the starting position ("startpos") and then makes the moves given in the
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  // or the starting position ("startpos") and then makes the moves given in the
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        while (is >> token && token != "moves")
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        while (is >> token && token != "moves")
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            fen += token + " ";
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            fen += token + " ";
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    else
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    else
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        return;
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        return;
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    pos.set(fen, Options["UCI_Chess960"], Threads.main());
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    States = StateListPtr(new std::deque<StateInfo>(1));
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    SetupStates = Search::StateStackPtr(new std::stack<StateInfo>);
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    pos.set(fen, Options["UCI_Chess960"], &States->back(), Threads.main());
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    // Parse move list (if any)
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    // Parse move list (if any)
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    while (is >> token && (m = UCI::to_move(pos, token)) != MOVE_NONE)
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    while (is >> token && (m = UCI::to_move(pos, token)) != MOVE_NONE)
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    {
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    {
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        SetupStates->push(StateInfo());
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        States->push_back(StateInfo());
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        pos.do_move(m, SetupStates->top(), pos.gives_check(m, CheckInfo(pos)));
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        pos.do_move(m, States->back(), pos.gives_check(m));
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    }
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    }
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  }
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  }
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  // setoption() is called when engine receives the "setoption" UCI command. The
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  // setoption() is called when engine receives the "setoption" UCI command. The
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  // go() is called when engine receives the "go" UCI command. The function sets
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  // go() is called when engine receives the "go" UCI command. The function sets
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  // the thinking time and other parameters from the input string, then starts
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  // the thinking time and other parameters from the input string, then starts
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  // the search.
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  // the search.
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  void go(const Position& pos, istringstream& is) {
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  void go(Position& pos, istringstream& is) {
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    Search::LimitsType limits;
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    Search::LimitsType limits;
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    string token;
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    string token;
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    limits.startTime = now(); // As early as possible!
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    limits.startTime = now(); // As early as possible!
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        else if (token == "movetime")  is >> limits.movetime;
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        else if (token == "movetime")  is >> limits.movetime;
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        else if (token == "mate")      is >> limits.mate;
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        else if (token == "mate")      is >> limits.mate;
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        else if (token == "infinite")  limits.infinite = 1;
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        else if (token == "infinite")  limits.infinite = 1;
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        else if (token == "ponder")    limits.ponder = 1;
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        else if (token == "ponder")    limits.ponder = 1;
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    Threads.start_thinking(pos, limits, SetupStates);
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    Threads.start_thinking(pos, States, limits);
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  }
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  }
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} // namespace
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} // namespace
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/// run 'bench', once the command is executed the function returns immediately.
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/// run 'bench', once the command is executed the function returns immediately.
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/// In addition to the UCI ones, also some additional debug commands are supported.
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/// In addition to the UCI ones, also some additional debug commands are supported.
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void UCI::loop(int argc, char* argv[]) {
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void UCI::loop(int argc, char* argv[]) {
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  Position pos(StartFEN, false, Threads.main()); // The root position
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  Position pos;
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  string token, cmd;
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  string token, cmd;
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  pos.set(StartFEN, false, &States->back(), Threads.main());
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  for (int i = 1; i < argc; ++i)
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  for (int i = 1; i < argc; ++i)
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      cmd += std::string(argv[i]) + " ";
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      cmd += std::string(argv[i]) + " ";
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  do {
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  do {