Obscure Mate in 2

Can you solve this puzzle devised by the late and great Paul Morphy?  There is actually a mate in 2 for White ... but what should they play next?

 Hint:  You have to force Black into a zugzwang it's the only way to win ...!

Show Solution

Solution: 1. Ra6! bxa6 2.b7# or 1. Ra6! ... Bishop moves anywhere 2.Rxa7#