157-Mate in two solution

Solution: 1. Qb3! [threat 2. Qc3, Qxd3#]
 1... Qg3 2. Qc3/c4#
 1... Qd5 2. Qc3#
 1... Qc4 2. Qxc4#
 1... Qxb3+ 2. Sxb3#