Mate in.... 12???

just chase the king all the way down with the rook. first move is rook to f2 and then king has to keep retreating until it is in the corner because of the position of the white king. you don't move either of the bishops for this one. checkmate should be king at b8 with rook at a8.

Here is another Mate in 12 with a 'staircase maneuver':

Originally posted by SwissGambit
Here is another Mate in 12 with a 'staircase maneuver':

[fen]8/8/8/8/8/8/ppQKPPP1/k7 w - - 0 1[/fen]

Originally posted by Thomaster
1.Q-c3 K-b1
2.Q-d3 K-a1
3.Q-d4 K-b1
4.Q-e4 K-a1
5.Q-e5 K-b1
6.Q-f5 K-a1
7.Q-f6 K-b1
8.Q-g6 K-a1
9.Q-g7 K-b1
10.Q-h7 K-a1
11.Q-h8 K-b1
12.Q-h1#

Another ladder...

Originally posted by heinzkat
Another ladder...

[fen]7Q/8/8/8/8/8/6rp/4K2k w - -[/fen]

White to move, mate in 12.
Oh, composed by Rinck (1917).