/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2009 Marco Costalba
+ Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
////
#include <cassert>
+#include <cstring>
+#include <iomanip>
+#include <string>
+#include <sstream>
#include "move.h"
-#include "piece.h"
-#include "position.h"
+#include "movegen.h"
+
+using std::string;
+
+////
+//// Local definitions
+////
+
+namespace {
+
+ enum Ambiguity {
+ AMBIGUITY_NONE, AMBIGUITY_FILE, AMBIGUITY_RANK, AMBIGUITY_BOTH
+ };
+
+ Ambiguity move_ambiguity(const Position& pos, Move m);
+ const string time_string(int milliseconds);
+ const string score_string(Value v);
+}
////
//// Functions
////
-/// move_from_string() takes a position and a string as input, and attempts to
-/// convert the string to a move, using simple coordinate notation (g1f3,
-/// a7a8q, etc.). In order to correctly parse en passant captures and castling
-/// moves, we need the position. This function is not robust, and expects that
-/// the input move is legal and correctly formatted.
+/// move_to_uci() converts a move to a string in coordinate notation
+/// (g1f3, a7a8q, etc.). The only special case is castling moves, where we
+/// print in the e1g1 notation in normal chess mode, and in e1h1 notation in
+/// Chess960 mode.
+
+const std::string move_to_uci(Move m, bool chess960) {
-Move move_from_string(const Position& pos, const std::string& str) {
+ std::string promotion;
+ Square from = move_from(m);
+ Square to = move_to(m);
- Square from, to;
- Piece piece;
- Color us = pos.side_to_move();
+ if (m == MOVE_NONE)
+ return "(none)";
- if (str.length() < 4)
- return MOVE_NONE;
+ if (m == MOVE_NULL)
+ return "0000";
- // Read the from and to squares
- from = square_from_string(str.substr(0, 2));
- to = square_from_string(str.substr(2, 4));
+ if (move_is_short_castle(m) && !chess960)
+ return from == SQ_E1 ? "e1g1" : "e8g8";
- // Find the moving piece
- piece = pos.piece_on(from);
+ if (move_is_long_castle(m) && !chess960)
+ return from == SQ_E1 ? "e1c1" : "e8c8";
- // If the string has more than 4 characters, try to interpret the 5th
- // character as a promotion
- if (type_of_piece(piece) == PAWN && str.length() > 4)
- {
- switch (tolower(str[4])) {
- case 'n':
- return make_promotion_move(from, to, KNIGHT);
- case 'b':
- return make_promotion_move(from, to, BISHOP);
- case 'r':
- return make_promotion_move(from, to, ROOK);
- case 'q':
- return make_promotion_move(from, to, QUEEN);
- }
- }
+ if (move_is_promotion(m))
+ promotion = char(tolower(piece_type_to_char(move_promotion_piece(m))));
+
+ return square_to_string(from) + square_to_string(to) + promotion;
+}
+
+
+/// move_from_uci() takes a position and a string representing a move in
+/// simple coordinate notation and returns an equivalent Move.
+
+Move move_from_uci(const Position& pos, const std::string& str) {
+
+ MoveStack mlist[MOVES_MAX];
+ MoveStack* last = generate<MV_LEGAL>(pos, mlist);
- if (piece == piece_of_color_and_type(us, KING))
+ for (MoveStack* cur = mlist; cur != last; cur++)
+ if (str == move_to_uci(cur->move, pos.is_chess960()))
+ return cur->move;
+
+ return MOVE_NONE;
+}
+
+
+/// move_to_san() takes a position and a move as input, where it is assumed
+/// that the move is a legal move from the position. The return value is
+/// a string containing the move in short algebraic notation.
+
+const string move_to_san(Position& pos, Move m) {
+
+ assert(pos.is_ok());
+ assert(move_is_ok(m));
+
+ string san;
+ Square from = move_from(m);
+ Square to = move_to(m);
+ PieceType pt = type_of_piece(pos.piece_on(from));
+
+ if (m == MOVE_NONE)
+ return "(none)";
+
+ if (m == MOVE_NULL)
+ return "(null)";
+
+ if (move_is_long_castle(m))
+ san = "O-O-O";
+ else if (move_is_short_castle(m))
+ san = "O-O";
+ else
{
- // Is this a castling move? A king move is assumed to be a castling
- // move if the destination square is occupied by a friendly rook, or
- // if the distance between the source and destination squares is more
- // than 1.
- if (pos.piece_on(to) == piece_of_color_and_type(us, ROOK))
- return make_castle_move(from, to);
-
- else if (square_distance(from, to) > 1)
+ if (pt != PAWN)
{
- // This is a castling move, but we have to translate it to the
- // internal "king captures rook" representation.
- SquareDelta delta = (to > from ? DELTA_E : DELTA_W);
- Square s = from + delta;
- while (relative_rank(us, s) == RANK_1 && pos.piece_on(s) != piece_of_color_and_type(us, ROOK))
- s += delta;
-
- return (relative_rank(us, s) == RANK_1 ? make_castle_move(from, s) : MOVE_NONE);
+ san += piece_type_to_char(pt);
+
+ switch (move_ambiguity(pos, m)) {
+ case AMBIGUITY_NONE:
+ break;
+ case AMBIGUITY_FILE:
+ san += file_to_char(square_file(from));
+ break;
+ case AMBIGUITY_RANK:
+ san += rank_to_char(square_rank(from));
+ break;
+ case AMBIGUITY_BOTH:
+ san += square_to_string(from);
+ break;
+ default:
+ assert(false);
+ }
+ }
+
+ if (pos.move_is_capture(m))
+ {
+ if (pt == PAWN)
+ san += file_to_char(square_file(from));
+
+ san += 'x';
+ }
+ san += square_to_string(to);
+
+ if (move_is_promotion(m))
+ {
+ san += '=';
+ san += piece_type_to_char(move_promotion_piece(m));
}
}
- else if (piece == piece_of_color_and_type(us, PAWN))
- {
- // En passant move? We assume that a pawn move is an en passant move
- // without further testing if the destination square is epSquare.
- if (to == pos.ep_square())
- return make_ep_move(from, to);
- }
- return make_move(from, to);
+
+ // The move gives check ? We don't use pos.move_is_check() here
+ // because we need to test for mate after the move is done.
+ StateInfo st;
+ pos.do_move(m, st);
+ if (pos.is_check())
+ san += pos.is_mate() ? "#" : "+";
+ pos.undo_move(m);
+
+ return san;
}
-/// move_to_string() converts a move to a string in coordinate notation
-/// (g1f3, a7a8q, etc.). The only special case is castling moves, where we
-/// print in the e1g1 notation in normal chess mode, and in e1h1 notation in
-/// Chess960 mode.
+/// line_to_san() takes a position and a line (an array of moves representing
+/// a sequence of legal moves from the position) as input, and returns a
+/// string containing the line in short algebraic notation. If the boolean
+/// parameter 'breakLines' is true, line breaks are inserted, with a line
+/// length of 80 characters. After a line break, 'startColumn' spaces are
+/// inserted at the beginning of the new line.
-const std::string move_to_string(Move move) {
+const string line_to_san(const Position& pos, Move line[], int startColumn, bool breakLines) {
- std::string str;
- Square from = move_from(move);
- Square to = move_to(move);
+ StateInfo st;
+ std::stringstream s;
+ string moveStr;
+ size_t length = 0;
+ size_t maxLength = 80 - startColumn;
+ Position p(pos, pos.thread());
- if (move == MOVE_NONE)
- str = "(none)";
- else if (move == MOVE_NULL)
- str = "0000";
- else
+ for (Move* m = line; *m != MOVE_NONE; m++)
{
- if (!Chess960)
+ moveStr = move_to_san(p, *m);
+ length += moveStr.length() + 1;
+ if (breakLines && length > maxLength)
{
- if (move_is_short_castle(move))
- return (from == SQ_E1 ? "e1g1" : "e8g8");
-
- if (move_is_long_castle(move))
- return (from == SQ_E1 ? "e1c1" : "e8c8");
+ s << "\n" << std::setw(startColumn) << " ";
+ length = moveStr.length() + 1;
}
- str = square_to_string(from) + square_to_string(to);
- if (move_is_promotion(move))
- str += piece_type_to_char(move_promotion_piece(move), false);
+ s << moveStr << ' ';
+
+ if (*m == MOVE_NULL)
+ p.do_null_move(st);
+ else
+ p.do_move(*m, st);
}
- return str;
+ return s.str();
}
-/// Overload the << operator, to make it easier to print moves.
+/// pretty_pv() creates a human-readable string from a position and a PV.
+/// It is used to write search information to the log file (which is created
+/// when the UCI parameter "Use Search Log" is "true").
+
+const string pretty_pv(const Position& pos, int time, int depth,
+ Value score, ValueType type, Move pv[]) {
+
+ const int64_t K = 1000;
+ const int64_t M = 1000000;
-std::ostream &operator << (std::ostream& os, Move m) {
+ std::stringstream s;
- return os << move_to_string(m);
+ // Depth
+ s << std::setw(2) << depth << " ";
+
+ // Score
+ s << (type == VALUE_TYPE_LOWER ? ">" : type == VALUE_TYPE_UPPER ? "<" : " ")
+ << std::setw(7) << score_string(score);
+
+ // Time
+ s << std::setw(8) << time_string(time) << " ";
+
+ // Nodes
+ if (pos.nodes_searched() < M)
+ s << std::setw(8) << pos.nodes_searched() / 1 << " ";
+ else if (pos.nodes_searched() < K * M)
+ s << std::setw(7) << pos.nodes_searched() / K << "K ";
+ else
+ s << std::setw(7) << pos.nodes_searched() / M << "M ";
+
+ // PV
+ s << line_to_san(pos, pv, 30, true);
+
+ return s.str();
}
-/// move_is_ok(), for debugging.
+namespace {
+
+ Ambiguity move_ambiguity(const Position& pos, Move m) {
+
+ MoveStack mlist[MOVES_MAX], *last;
+ Move candidates[8];
+ Square from = move_from(m);
+ Square to = move_to(m);
+ Piece pc = pos.piece_on(from);
+ int matches = 0, f = 0, r = 0;
+
+ // If there is only one piece 'pc' then move cannot be ambiguous
+ if (pos.piece_count(pos.side_to_move(), type_of_piece(pc)) == 1)
+ return AMBIGUITY_NONE;
+
+ // Collect all legal moves of piece 'pc' with destination 'to'
+ last = generate<MV_LEGAL>(pos, mlist);
+ for (MoveStack* cur = mlist; cur != last; cur++)
+ if (move_to(cur->move) == to && pos.piece_on(move_from(cur->move)) == pc)
+ candidates[matches++] = cur->move;
-bool move_is_ok(Move m) {
+ if (matches == 1)
+ return AMBIGUITY_NONE;
- return square_is_ok(move_from(m)) && square_is_ok(move_to(m));
+ for (int i = 0; i < matches; i++)
+ {
+ if (square_file(move_from(candidates[i])) == square_file(from))
+ f++;
+
+ if (square_rank(move_from(candidates[i])) == square_rank(from))
+ r++;
+ }
+
+ return f == 1 ? AMBIGUITY_FILE : r == 1 ? AMBIGUITY_RANK : AMBIGUITY_BOTH;
+ }
+
+
+ const string time_string(int millisecs) {
+
+ const int MSecMinute = 1000 * 60;
+ const int MSecHour = 1000 * 60 * 60;
+
+ std::stringstream s;
+ s << std::setfill('0');
+
+ int hours = millisecs / MSecHour;
+ int minutes = (millisecs - hours * MSecHour) / MSecMinute;
+ int seconds = (millisecs - hours * MSecHour - minutes * MSecMinute) / 1000;
+
+ if (hours)
+ s << hours << ':';
+
+ s << std::setw(2) << minutes << ':' << std::setw(2) << seconds;
+ return s.str();
+ }
+
+
+ const string score_string(Value v) {
+
+ std::stringstream s;
+
+ if (v >= VALUE_MATE - 200)
+ s << "#" << (VALUE_MATE - v + 1) / 2;
+ else if (v <= -VALUE_MATE + 200)
+ s << "-#" << (VALUE_MATE + v) / 2;
+ else
+ {
+ float floatScore = float(v) / float(PawnValueMidgame);
+ if (v >= 0)
+ s << '+';
+
+ s << std::setprecision(2) << std::fixed << floatScore;
+ }
+ return s.str();
+ }
}