/*
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
namespace {
+ // FEN string for the initial position
+ const string StartPositionFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
+
// UCIInputParser is a class for parsing UCI input. The class
// is actually a string stream built on a given input string.
-
typedef istringstream UCIInputParser;
- // The root position. This is set up when the user (or in practice, the GUI)
- // sends the "position" UCI command. The root position is sent to the think()
- // function when the program receives the "go" command.
- Position RootPosition(StartPosition);
-
// Local functions
- bool handle_command(const string& command);
+ bool handle_command(Position& pos, const string& command);
void set_option(UCIInputParser& uip);
- void set_position(UCIInputParser& uip);
- bool go(UCIInputParser& uip);
- void perft(UCIInputParser& uip);
+ void set_position(Position& pos, UCIInputParser& uip);
+ bool go(Position& pos, UCIInputParser& uip);
+ void perft(Position& pos, UCIInputParser& uip);
}
void uci_main_loop() {
- RootPosition.from_fen(StartPosition);
+ Position pos(StartPositionFEN, 0); // The root position
string command;
do {
if (!getline(cin, command))
command = "quit";
- } while (handle_command(command));
+ } while (handle_command(pos, command));
}
// and calls the appropriate functions. In addition to the UCI
// commands, the function also supports a few debug commands.
- bool handle_command(const string& command) {
+ bool handle_command(Position& pos, const string& command) {
UCIInputParser uip(command);
string token;
return false;
if (token == "go")
- return go(uip);
+ return go(pos, uip);
if (token == "uci")
{
else if (token == "ucinewgame")
{
push_button("New Game");
- Position::init_piece_square_tables();
- RootPosition.from_fen(StartPosition);
+ pos.from_fen(StartPositionFEN);
}
else if (token == "isready")
cout << "readyok" << endl;
else if (token == "position")
- set_position(uip);
+ set_position(pos, uip);
else if (token == "setoption")
set_option(uip);
// Perhaps they should be removed later in order to reduce the
// size of the program binary.
else if (token == "d")
- RootPosition.print();
+ pos.print();
else if (token == "flip")
{
- Position p(RootPosition);
- RootPosition.flipped_copy(p);
+ Position p(pos, pos.thread());
+ pos.flipped_copy(p);
}
else if (token == "eval")
{
- EvalInfo ei;
- cout << "Incremental mg: " << mg_value(RootPosition.value())
- << "\nIncremental eg: " << eg_value(RootPosition.value())
- << "\nFull eval: " << evaluate(RootPosition, ei, 0) << endl;
+ Value evalMargin;
+ cout << "Incremental mg: " << mg_value(pos.value())
+ << "\nIncremental eg: " << eg_value(pos.value())
+ << "\nFull eval: " << evaluate(pos, evalMargin) << endl;
}
else if (token == "key")
- cout << "key: " << hex << RootPosition.get_key()
- << "\nmaterial key: " << RootPosition.get_material_key()
- << "\npawn key: " << RootPosition.get_pawn_key() << endl;
+ cout << "key: " << hex << pos.get_key()
+ << "\nmaterial key: " << pos.get_material_key()
+ << "\npawn key: " << pos.get_pawn_key() << endl;
else if (token == "perft")
- perft(uip);
+ perft(pos, uip);
else
cout << "Unknown command: " << command << endl;
// ("position"), and is ready to read the second token ("startpos"
// or "fen", if the input is well-formed).
- void set_position(UCIInputParser& uip) {
+ void set_position(Position& pos, UCIInputParser& uip) {
string token;
return;
if (token == "startpos")
- RootPosition.from_fen(StartPosition);
+ pos.from_fen(StartPositionFEN);
else if (token == "fen")
{
string fen;
fen += token;
fen += ' ';
}
- RootPosition.from_fen(fen);
+ pos.from_fen(fen);
}
if (uip.good())
StateInfo st;
while (uip >> token)
{
- move = move_from_string(RootPosition, token);
- RootPosition.do_move(move, st);
- if (RootPosition.rule_50_counter() == 0)
- RootPosition.reset_game_ply();
+ move = move_from_string(pos, token);
+ pos.do_move(move, st);
+ if (pos.rule_50_counter() == 0)
+ pos.reset_game_ply();
+
+ pos.inc_startpos_ply_counter(); //FIXME: make from_fen to support this and rule50
}
// Our StateInfo st is about going out of scope so copy
- // its content inside RootPosition before they disappear.
- RootPosition.detach();
+ // its content inside pos before it disappears.
+ pos.detach();
}
}
}
void set_option(UCIInputParser& uip) {
- string token, name;
+ string token, name, value;
if (!(uip >> token)) // operator>>() skips any whitespace
return;
while (uip >> token && token != "value")
name += (" " + token);
- if (token == "value")
+ if (token == "value" && uip >> value)
{
- // Reads until end of line and left trim white space
- getline(uip, token);
- token.erase(0, token.find_first_not_of(" \n\r\t"));
+ while (uip >> token)
+ value += (" " + token);
- set_option_value(name, token);
+ set_option_value(name, value);
} else
push_button(name);
}
// parameters. Returns false if a quit command is received while
// thinking, returns true otherwise.
- bool go(UCIInputParser& uip) {
+ bool go(Position& pos, UCIInputParser& uip) {
string token;
else if (token == "searchmoves")
{
int numOfMoves = 0;
- while (!uip.eof())
- {
- uip >> token;
- searchMoves[numOfMoves++] = move_from_string(RootPosition, token);
- }
+ while (uip >> token)
+ searchMoves[numOfMoves++] = move_from_string(pos, token);
+
searchMoves[numOfMoves] = MOVE_NONE;
}
}
- if (moveTime)
- infinite = true; // HACK
-
- assert(RootPosition.is_ok());
+ assert(pos.is_ok());
- return think(RootPosition, infinite, ponder, RootPosition.side_to_move(),
- time, inc, movesToGo, depth, nodes, moveTime, searchMoves);
+ return think(pos, infinite, ponder, time, inc, movesToGo,
+ depth, nodes, moveTime, searchMoves);
}
- void perft(UCIInputParser& uip) {
+ void perft(Position& pos, UCIInputParser& uip) {
string token;
int depth, tm, n;
- Position pos = RootPosition;
if (!(uip >> depth))
return;
tm = get_system_time();
- n = perft(pos, depth * OnePly);
+ n = perft(pos, depth * ONE_PLY);
tm = get_system_time() - tm;
std::cout << "\nNodes " << n
projects / stockfish / blobdiff