Mate in 4

White to play.

Originally posted by ThudanBlunder
White to play.

1.Rxa7 (2.Ra8) 1...d6 2.Ra8+ Kd7 3.Rxb7 (4.Rcxc7) 3...d5 4.Rxd5#

1...e6 and 1...f6 are refuted by 3.Rxc7 and 3.Rxd7 respectively.

It looks like 1.Rxh7 works, with the same idea.

Also, there are duals such as 1.Rxa7 d6 2.Ra8+ Kd7 3.Rxe7.

Edit: Oops, 3.Rxb7 does not work. 3...e5!

Originally posted by BigDoggProblem
1.Rxa7 (2.Ra8) 1...d6 2.Ra8+ Kd7 3.Rxb7 (4.Rcxc7) 3...d5 4.Rxd5#

1...e6 and 1...f6 are refuted by 3.Rxc7 and 3.Rxd7 respectively.

It looks like 1.Rxh7 works, with the same idea.

Also, there are duals such as 1.Rxa7 d6 2.Ra8+ Kd7 3.Rxe7.

Edit: Oops, 3.Rxb7 does not work. 3...e5!

I expect 1.Rxb7 or 1.Rxg7, avoiding any 'oops'es.

Originally posted by Mephisto2
I expect 1.Rxb7 or 1.Rxg7, avoiding any 'oops'es.

According to my solving program, 1.Rxa7, Rxb7, Rxc7, Rxg7 and Rxh7 all work.

The line I missed was 1.Rxa7 d6 2.Ra8+ Kd7 3.Rxd6+!! with Rook mates coming from three different directions, depending on how Black captures.