/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+ Copyright (C) 2008-2012 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
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-
-////
-//// Includes
-////
-
#include <cassert>
-#include <cstring>
-#include <iomanip>
#include <string>
-#include <sstream>
-#include "move.h"
#include "movegen.h"
+#include "position.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_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.
+/// Chess960 mode. Instead internally Move is coded as "king captures rook".
-const std::string move_to_uci(Move m, bool chess960) {
+const string move_to_uci(Move m, bool chess960) {
- std::string promotion;
- Square from = move_from(m);
- Square to = move_to(m);
+ Square from = from_sq(m);
+ Square to = to_sq(m);
+ string promotion;
if (m == MOVE_NONE)
return "(none)";
if (m == MOVE_NULL)
return "0000";
- if (move_is_short_castle(m) && !chess960)
- return from == SQ_E1 ? "e1g1" : "e8g8";
+ if (is_castle(m) && !chess960)
+ to = from + (file_of(to) == FILE_H ? Square(2) : -Square(2));
- if (move_is_long_castle(m) && !chess960)
- return from == SQ_E1 ? "e1c1" : "e8c8";
-
- if (move_is_promotion(m))
- promotion = char(tolower(piece_type_to_char(move_promotion_piece(m))));
+ if (is_promotion(m))
+ promotion = char(tolower(piece_type_to_char(promotion_type(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) {
+/// simple coordinate notation and returns an equivalent Move if any.
+/// Moves are guaranteed to be legal.
- MoveStack mlist[MOVES_MAX];
- MoveStack* last = generate<MV_LEGAL>(pos, mlist);
+Move move_from_uci(const Position& pos, const string& str) {
- for (MoveStack* cur = mlist; cur != last; cur++)
- if (str == move_to_uci(cur->move, pos.is_chess960()))
- return cur->move;
+ for (MoveList<MV_LEGAL> ml(pos); !ml.end(); ++ml)
+ if (str == move_to_uci(ml.move(), pos.is_chess960()))
+ return ml.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
+/// that the move is a legal move for 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";
+ assert(is_ok(m));
+
+ Bitboard attackers;
+ bool ambiguousMove, ambiguousFile, ambiguousRank;
+ Square sq, from = from_sq(m);
+ Square to = to_sq(m);
+ PieceType pt = type_of(pos.piece_moved(m));
+ string san;
+
+ if (is_castle(m))
+ san = (to_sq(m) < from_sq(m) ? "O-O-O" : "O-O");
else
{
if (pt != PAWN)
{
- 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);
+ san = piece_type_to_char(pt);
+
+ // Disambiguation if we have more then one piece with destination 'to'
+ // note that for pawns is not needed because starting file is explicit.
+ attackers = pos.attackers_to(to) & pos.pieces(pt, pos.side_to_move());
+ attackers ^= from;
+ ambiguousMove = ambiguousFile = ambiguousRank = false;
+
+ while (attackers)
+ {
+ sq = pop_1st_bit(&attackers);
+
+ // Pinned pieces are not included in the possible sub-set
+ if (!pos.pl_move_is_legal(make_move(sq, to), pos.pinned_pieces()))
+ continue;
+
+ if (file_of(sq) == file_of(from))
+ ambiguousFile = true;
+
+ if (rank_of(sq) == rank_of(from))
+ ambiguousRank = true;
+
+ ambiguousMove = true;
+ }
+
+ if (ambiguousMove)
+ {
+ if (!ambiguousFile)
+ san += file_to_char(file_of(from));
+ else if (!ambiguousRank)
+ san += rank_to_char(rank_of(from));
+ else
+ san += square_to_string(from);
}
}
- if (pos.move_is_capture(m))
+ if (pos.is_capture(m))
{
if (pt == PAWN)
- san += file_to_char(square_file(from));
+ san += file_to_char(file_of(from));
san += 'x';
}
+
san += square_to_string(to);
- if (move_is_promotion(m))
+ if (is_promotion(m))
{
san += '=';
- san += piece_type_to_char(move_promotion_piece(m));
+ san += piece_type_to_char(promotion_type(m));
}
}
- // 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;
-}
-
-
-/// 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;
- const int startColumn = 29;
- const size_t maxLength = 80 - startColumn;
- const string lf = string("\n") + string(startColumn, ' ');
-
- StateInfo st;
- std::stringstream s;
- string san;
- size_t length = 0;
-
- Position p(pos, pos.thread());
-
- // First print depth, score, time and searched nodes...
- s << std::setw(2) << depth
- << (type == VALUE_TYPE_LOWER ? " >" : type == VALUE_TYPE_UPPER ? " <" : " ")
- << std::setw(7) << score_string(score)
- << std::setw(8) << time_string(time);
-
- 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 ";
-
- // ...then print the full PV line in short algebraic notation
- for (Move* m = pv; *m != MOVE_NONE; m++)
+ if (pos.move_gives_check(m, CheckInfo(pos)))
{
- san = move_to_san(p, *m);
- length += san.length() + 1;
-
- if (length > maxLength)
- {
- length = san.length() + 1;
- s << lf;
- }
- s << san << ' ';
-
- p.do_move(*m, st);
+ StateInfo st;
+ pos.do_move(m, st);
+ san += MoveList<MV_LEGAL>(pos).size() ? "+" : "#";
+ pos.undo_move(m);
}
- return s.str();
-}
-
-
-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;
-
- if (matches == 1)
- return AMBIGUITY_NONE;
-
- 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();
- }
+ return san;
}
projects / stockfish / blobdiff