private void checkMove4 () {
	if (row != 7 && col != 7 && Othello.board[row+1][col+1] == null) {
	    for (int i=row, j=col; i>=0 && j>=0; i--, j--) {
		if (Othello.board[i][j]==player) {
		    list[4] = new Possible(row+1, col+1, i, j); break;
		}
		else if (Othello.board[i][j] == null) break;
	    }
	}
    }