Solution: 1. Se7-f5! threat 2. Rd5-e5, Sf5-d6#
1. ... Ba7-c5 2. Rd5-e5#
1. ... Ba7-d4 2. Sf5-d6#
1. ... Ba7-b8 2. Sh1-f2#
Problems which include settings of 7 to 12 pieces are called Meredith for the famous American composer William Meredith. (1835-1903)
