a) diagram
1.Qf4+? (A) Kd5 (a) 2.Be8 (B) zugzwang. Ke6 3.Qe5# but 1...Kd3! (b)
1.Be8? (B) zugzwang. Kd5 (a) 2.Qf4 (A) zugzwang. Ke6 3.Qe5# but 1...Kd3! (b)
1.Bb5? threat: 2.Qf6 zugzwang. Kd5 3.Qe5# 2...Ke3 3.Qf4# (MM)
2.Qf4+ Kd5 3.Qe5# but 1...Kd5! (a)
1.Bb4? zugzwang. but 1...Ke5! (c)
1...Kd5 (a) 2.Qe3 zugzwang. Kc4 3.Qe4# (MM)
1...Kd3 (b) 2.Bc2+ Kc4 3.Qc5#
1.Bc5! zugzwang.
1...Kd5 (a) 2.Qe3 zugzwang. Kc4 3.Qd4#
1...Kd3 (b) 2.Qc2# (MM)
1...Ke5 (c) 2.Bd7 threat: 3.Qd4#/3.Qf5#
2...Ke4 3.Qf5# (MM)
2...Kd5 3.Qd4#
b) wBa4 → e8
1.Be7? zugzwang. but 1...Kd3! (b)
1...Kd5 (a) 2.Qf4 zugzwang. Ke6 3.Qe4# (MM)
1...Ke5 (c) 2.Bc6 threat: 3.Qf6#
1.Qg3! zugzwang.
1...Kd5 (a) 2.Qf4 zugzwang. Ke6 3.Qe5#
1...Kd4 (d) 2.Bb5 threat: 3.Qe5#/3.Qd3#
2...Kd5 3.Qe5#
2...Ke4 3.Qd3# (MM)
1...Kf5 2.Qg6# (MM)
c) wQf2 → a3
1.Qb3? zugzwang.
1...Kd4 (d) 2.Bb5 Ke4 3.Qd3# (X) (MM) but 1...Kf5!
1.Bd7! threat: 2.Qc3 zugzwang. Kd5 3.Qd3# (X) (MM)
1...Kd4 (d) 2.Bf5 threat: 3.Qc5#/3.Qd3#
2...Kc4 3.Qd3# (X) (MM)
2...Kd5 3.Qc5#
d) wBd6 → h2
1.Bb5! threat: 2.Qf6 zugzwang. Kd5 3.Qe5# (MM) 2...Ke3 3.Qf4# (MM)
2.Qf4+ Kd5 3.Qe5#/3.Qc4#
1...Kd5 (a) 2.Qf5+ Kd4 3.Qe5# (MM)
