You have a square 5 x 5 board with four rooks in the corners:

Note: for reference, assume the rooks are labeled A, B, C, D as follows: A    B C    D

You can move the rooks horizontally or vertically. The only problem is that when you move a rook, it will keep going in the same direction until it hits another rook or the edge of the board.

You want to move a rook into the darkened square on the board.

How can this be done in no more than 10 moves?

I found two solutions, but in eleven moves, so it's back to searching...

A right, D left, A down, B left, D right, D up, C right, A up, D down, B left, B down.

A right, A down, C right, B left, A up, B right, C up, D left, A down, D right, D up.
 

Posted by e.g. on 2004-03-08 13:56:17