import java.io.PrintStream;
import java.util.ArrayList;

class Board {
    ArrayList<Piece> Pieces;

    Board() {
        this.Pieces = new ArrayList<Piece>();
    }

    void add(Piece piece) {
        if (piece.board != this)
            throw new IllegalArgumentException("wrong board");
        if (piece.board.pieceAt(piece.row, piece.col) != null)
            throw new IllegalArgumentException("field is occupied");
        Pieces.add(piece);
    }

    void printBoard(PrintStream out) {
        out.println("    1   2   3   4   5   6   7   8");
        out.println("  +---+---+---+---+---+---+---+---+");
        for (int Row = 1; Row <= 8; Row++) {
            out.print("" + Row + " ");
            for (int Col = 1; Col <= 8; Col++) {
                final Piece p = pieceAt(Row, Col);
                final char c = p == null ? ' ' : p.charRep();
                out.print("| " + c + " ");
            }
            out.println("|");
            out.println("  +---+---+---+---+---+---+---+---+");
        }
    }

    Piece pieceAt(int col, int row) {
        for (Piece p : Pieces)
            if (p.row == row && p.col == col)
                return p;
        return null;
    }

    void check(PrintStream out) {
        for (Piece P1 : Pieces) {
            out.println(P1.showPiece());
            for (Piece P2 : Pieces)
                if (P1 != P2)
                    if (P1.canCapture(P2))
                        out.println("   can capture " + P2.showPiece());
                    else
                        out.println("   cannot capture " + P2.showPiece());
        }
    }
}