BRD files are designed to easily generate test problems that are easy to create and debug. It supports 9x9, 13x13 and 19x19 boards with the following format: 9 X X X X X O . O . 9 8 O O O X X O O . O 8 7 O O X X X X O O O 7 6 O . O X . X O . . 6 5 O . O X X X O . . 5 4 O O O X . X O O O 4 3 . O X X X X X O . 3 2 . O O X . X O O . 2 1 . O X X X O O . O 1 a b c d e f g h j