Solution: 1. Sf6! [2. Sd7+
2. ... Bxd7+ 3. Qb5 ... Bxb5#]
1. ... Bxg2 2. Rac6+
2. ... Bxc6+ 3. Qb5 ... Bxb5#
1. ... Bg4 2. Sd7+
2. ... Bxd7+ 3. Qb5 ... Bxb5#
1. ... Bf5 2. Sd7+
2. ... Bxd7+ 3. Qb5 ... Bxb5#
1. ... Be6 2. Sd7+
2. ... Bxd7+ 3. Qb5 ... Bxb5#
1. ... Bc8 2. Sd7+
2. ... Bxd7+ 3. Qb5 ... Bxb5#
In SELFMATES white FORCES black to give mate.
