board 16 16 B N N B N N N N N N N N N B N N W C C C C C C C C C C C C C C C W C C C C C B C C C C C W C C C W C C C C N C C C C C W C C C C W C C C C C C C C C C C C C C C W W C C C C C C C N W C C C C N W N C C C C C C C C C C C W C C B C C C N W C B B W C C C N C C W C C C C C C B B W C C C C C C W C W C C C C N N C C C N W C C W C N C C C C N W C C C C N C N B C C C C C C C C W C C C C C C W C C C W C C C C C C C C C C W W C C B C C C C C C C C C C N C W C C C C N W C C C C C C C C C W C C C C C C W C C W C C C C C mirrors 8 2 1 / 4 7 4 \ 1 14 4 / 4 12 6 / 3 10 8 \ 3 6 12 / 2 1 13 / 1 11 14 / 2 robots 5 6 0 5 14 0 15 2 9 13 6 target 0 3 13 4 solution 11 move 3 15 1 move 3 15 0 move 4 13 0 move 4 14 0 move 3 15 4 move 3 14 12 move 2 6 15 move 3 6 14 move 4 14 12 move 4 6 13 move 4 3 13