83-Problem Solution.

Set Play:
1. ... f5 2. Be5#
1. ... Kc3 [a] 2. Rxd3 [A] #
1. ... d2 2. Sb3/c2#

Solution: 1. Bf5! [2. Rxd3 [A] #]
1. ... Kd5 [b] /c3 [a] 2. Rxd3 [A] #

Again the theme of this problem is a transfered mate.