Set Play:
1. ... Bh7 [a] 2. Qc8 [A] #
1. ... fxg6 [b] 2. Qxg8 [B] #
1. ... f5 2. Se5#
Solution: 1. Kd2! waiting
1. ... Bh7 [a] 2. Qc8 [A] #
1. ... fxg6 [b] 2. Qxg8 [B] #
1. ... f5 2. Se5#
1. ... d3 2. Se3#
Here we have a mutate or changed mate. White has set replies provided for all of Black’s moves in the initial position, but a waiting key changes the white response to at least one of these black moves.
