118-Solution problem mate in two

Solution: 1. Rf3-f6! threat 2. Rf6-c6#
 1. ... Re8-c8, Bg8-e6 2. Sg6xe5#
 1. ... Re8-e6, Bg8-d5 2. Bh1(x)d5#

 Grimshaw is the name of this theme in which two pieces of the same colour (usually a rook and a bishop) interfere with each others line of action, by playing in turn to a square where the two lines intersect.