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Chess.hpp

The file chess.hpp is to include in you project and contains all the code. You don'et need to make a library

Board

Board b(constants::STARTPOS)

generate a Board initalized as regular game

You can debug a board for example with one of the two functions, the first one display chess board from Black player, the other from White player.

void printBoardBlack(  Board &p )
{
 cout <<"--------"<<endl;
 for ( int i=0; i<64; i++) {
           cout << std::string(p.at(Square(i)))   ;
           if ( (i+1)%8 == 0 ) cout << endl;
        }
 cout <<"--------"<<endl;
}

void printBoardWhite(  Board &p )
{
 cout <<"--------"<<endl;
 for ( int line=7; line>=0; line--) 
 {
 for ( int col=0; col<=7; col++) {
      cout << std::string(p.at(Square(line*8+col)))   ;
        }
  cout <<endl;
 }
 cout <<"--------"<<endl;
}

The second function will display

--------
rnbqkbnr
pppppppp
........
........
........
........
PPPPPPPP
RNBQKBNR
--------

You can generate a Board from a FEN by the method

Board::Board(std::string_view fen)

or

void setFen(std::string_view fen);

From a Board you can generate a FEN by the function

std::string getFen(bool moveCounters = true);

Bitboard

BitBoard is use to see the presence of piece on a square :

• O : no piece
• 1 : a piece

The value 1 can be 1 black or 1 white piece on the square

BitBoard are construct from Board with one on the following methods

• us(Color color)
• them(Color color)
• all to see the non empty cases
• pieces show the presence of a piece ( with or without color, you have the choice with 2 functions.

Bitboard c= b.pieces(PieceType::ROOK);

us Color black is same a them color white

cout<<b.us(Color::WHITE)<<endl;

The us method gives the chessboard with 1 where you have pieces

00000000
00000000
00000000
00000000
00001000
00000000
11110111
11111111

The them method gives the chessboard with 1 whee your oppenent has pieces

The methods to produce Bitboard are all() and occ()

PackedBoard

The are also Packboard a concurent of FEN not readable but more compact.

Moves

Presentation

You can make a move on the board with makeMove(move)

Board b(constants::STARTPOS)
Move m;
m.uci::uciToMove(board,"e2e4");
b.makemove(move)

uciToMove read the move in e2e4 syntax without any information about the piece unless the piece on the departure square : e2 ie a pawn.

The Move will be seen with the method printBoardWhite

You can add many moves :

m=uci::uciToMove(b,"d7d5");b.makeMove(m);list.add(m);
m=uci::uciToMove(b,"e4d5");b.makeMove(m);list.add(m);

But wih this method you will not be able to suppress moves or to suppress a move.

We will see Movelist who is a list of moves.

If you add an erroneous move you will have a error message.

You can unmake a move by the function unmakeMove(const Move move);

Functions with moves

• isCapture : checkif a move is a capture, enpassant moves are also considered captures.

bool isCapture(const Move move);

Miscellaneous

• Color sideToMove() give the side to move
• bool isRepetition(int count = 2); move is a repetition ?
• bool isInsufficientMaterial();

cout<<b.isInsufficientMaterial()<<endl;

• Square : at

Square s(Rank::RANK_1,File::FILE_A);
cout<<"ok :"<<b.at(s)<<endl;

• CastlingRights castlingRights();