board.m

// ...

Piece* pA2 = [[Piece alloc] initWithColor:ChessColorWhite andPiece:ChessPiecePawn] ;
Square* A2 = [Square squareWithPiece:pA2 andOffset:8];

// ...

self.squares = @[A1,B1,C1,D1,E1,F1,G1,H1,A2,B2,C2,D2,E2,F2,G2,H2,A3,B3,C3,D3,E3,F3,G3,H3,A4,B4,C4,D4,E4,F4,G4,H4,A5,B5,C5,D5,E5,F5,G5,H5,A6,B6,C6,D6,E6,F6,G6,H6,A7,B7,C7,D7,E7,F7,G7,H7,A8,B8,C8,D8,E8,F8,G8,H8];

 // ...
 let pA2 = Piece(c: ChessColor.White, p: ChessPiece.pawn)
 let A2 = Square(pA2, o: 8);
 squares.append(A2)
 // ...