1.Qe4? (2.Qb4#[A])
but 1...Kxb6!
1.Qe7? (2.Qc5#[B]/Qb4#[A])
but 1...Kxb6!
1.Qg4? (2.Qb4#[A])
but 1...Kxb6!
1.Qc8? (2.Qc5#[B])
but 1...Kxb6!
1.Qe2?? (2.Qb5#)
but 1...Kxb6!
1.Qe8?? (2.Qb5#)
but 1...Kxb6!
1.Qc6?? (2.Qc5#[B]/Qb5#/Rb5#)
but 1...bxc6!
1.Qc4?? (2.Qc5#[B]/Qb4#[A]/Qb5#)
but 1...Kxb6!
1.Qd7?? (2.Qb5#)
but 1...Kxb6!
1.Rb4?? (2.Qb6#)
but 1...b5!
1.Rb3?? (2.Qb6#)
but 1...b5!
1.Rb2?? (2.Qb6#)
but 1...b5!
1.Rb1?? (2.Qb6#)
but 1...b5!
1.Rd6?? zz
1...Kb5 2.Qd5#
1...b5 2.Ra6#
but 1...b6!
1.Kb2! zz
1...Ka4 2.Qa2#