2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
4 Copyright (C) 2008-2014 Marco Costalba, Joona Kiiski, Tord Romstad
6 Stockfish is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 Stockfish is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
31 static const char* PieceToChar[COLOR_NB] = { " PNBRQK", " pnbrqk" };
34 /// score_to_uci() converts a value to a string suitable for use with the UCI
35 /// protocol specifications:
37 /// cp <x> The score from the engine's point of view in centipawns.
38 /// mate <y> Mate in y moves, not plies. If the engine is getting mated
39 /// use negative values for y.
41 string score_to_uci(Value v, Value alpha, Value beta) {
45 if (abs(v) < VALUE_MATE_IN_MAX_PLY)
46 ss << "cp " << v * 100 / PawnValueEg;
48 ss << "mate " << (v > 0 ? VALUE_MATE - v + 1 : -VALUE_MATE - v) / 2;
50 ss << (v >= beta ? " lowerbound" : v <= alpha ? " upperbound" : "");
56 /// move_to_uci() converts a move to a string in coordinate notation
57 /// (g1f3, a7a8q, etc.). The only special case is castling moves, where we print
58 /// in the e1g1 notation in normal chess mode, and in e1h1 notation in chess960
59 /// mode. Internally castling moves are always encoded as "king captures rook".
61 const string move_to_uci(Move m, bool chess960) {
63 Square from = from_sq(m);
72 if (type_of(m) == CASTLING && !chess960)
73 to = make_square(to > from ? FILE_G : FILE_C, rank_of(from));
75 string move = to_string(from) + to_string(to);
77 if (type_of(m) == PROMOTION)
78 move += PieceToChar[BLACK][promotion_type(m)]; // Lower case
84 /// move_from_uci() takes a position and a string representing a move in
85 /// simple coordinate notation and returns an equivalent legal Move if any.
87 Move move_from_uci(const Position& pos, string& str) {
89 if (str.length() == 5) // Junior could send promotion piece in uppercase
90 str[4] = char(tolower(str[4]));
92 for (MoveList<LEGAL> it(pos); *it; ++it)
93 if (str == move_to_uci(*it, pos.is_chess960()))
100 /// pretty_pv() formats human-readable search information, typically to be
101 /// appended to the search log file. It uses the two helpers below to pretty
102 /// format the time and score respectively.
104 static string format(int64_t msecs) {
106 const int MSecMinute = 1000 * 60;
107 const int MSecHour = 1000 * 60 * 60;
109 int64_t hours = msecs / MSecHour;
110 int64_t minutes = (msecs % MSecHour) / MSecMinute;
111 int64_t seconds = ((msecs % MSecHour) % MSecMinute) / 1000;
118 ss << setfill('0') << setw(2) << minutes << ':' << setw(2) << seconds;
123 static string format(Value v) {
127 if (v >= VALUE_MATE_IN_MAX_PLY)
128 ss << "#" << (VALUE_MATE - v + 1) / 2;
130 else if (v <= VALUE_MATED_IN_MAX_PLY)
131 ss << "-#" << (VALUE_MATE + v) / 2;
134 ss << setprecision(2) << fixed << showpos << double(v) / PawnValueEg;
139 string pretty_pv(const Position& pos, int depth, Value value, int64_t msecs, Move pv[]) {
141 const uint64_t K = 1000;
142 const uint64_t M = 1000000;
145 ss << setw(2) << depth << setw(8) << format(value) << setw(8) << format(msecs);
147 if (pos.nodes_searched() < M)
148 ss << setw(8) << pos.nodes_searched() / 1 << " ";
150 else if (pos.nodes_searched() < K * M)
151 ss << setw(7) << pos.nodes_searched() / K << "K ";
154 ss << setw(7) << pos.nodes_searched() / M << "M ";
156 string str = ss.str();
158 for (Move *m = pv; *m != MOVE_NONE; m++)
159 str += move_to_uci(*m, pos.is_chess960()) + ' ';