Solution:
1...Qc4/Qc3/Qc2/Qc1/Qb5/Qa5/Qd5/Qe5/Qf5/Qd4/Qf2/Qg1/Qf8/Qb6 2.Nf8#
1.Re5[A]? (2.Rc3#[B])
1...Kxh7[b] 2.Rd7#[C]
1...Qe3[c] 2.Nf8#/Rdxe3#
1...Qc4/Qc2/Qc1/Qb5/Qxe5/Qg1 2.Nf8#
1...Qd5 2.Rdxd5#/Nf8#
1...Qd4 2.Rxd4#/Nf8#
1...Qf2 2.Rf3#/Nf8#
1...Qd6 2.Rd4#/Rdd5#/Rxd6#
1...Qb6 2.Rb3#[D]/Nf8#
but 1...Qb4[a]!
2 tries skipped1.Re7[E]?? (2.Nf8#/Rg7#)
1...Qe3[c] 2.Rg7#/Rdxe3#
1...Qxg5[d] 2.Rg7#/Rg3#[F]
1...Nf7 2.Nf8#
1...Nd7 2.Rg7#
but 1...Qxe7!
1.Rd6?? (2.Nf8#)
1...Kxh7[b] 2.Re7#[E]
1...Qe3[c] 2.Rxe3#[I]
1...Qxd6 2.Rd4#
but 1...Nd7!
1.Rc4[G]? (2.Rd5#[H])
1...Qb4[a] 2.Rb3#[D]
1...Kxh7[b] 2.Rd7#[C]
1...Qe3[c] 2.Rxe3#[I]
1...Qxg5[d] 2.Rg3#[F]
1...Qxc4/Qb5/Qe5/Qf5/Qg1 2.Nf8#
1...Qd4 2.Rdxd4#/Nf8#
1...Qf2 2.Rf3#/Nf8#
1...Qa3 2.Rdc3#/Rb3#[D]/Rxa3#
1...Qb6 2.Rb3#[D]/Nf8#
but 1...Qe7!
1.Rd5[H]? (2.Rc4#[G])
1...Qb4[a] 2.Rxb4#[J]
1...Kxh7[b] 2.Re7#[E]
1...Qe3[c] 2.Rxe3#[I]/Nf8#
1...Qc3/Qc2/Qc1/Qb5/Qxd5 2.Nf8#
1...Qd4 2.Nf8#/Rexd4#
1...Qf2 2.Nf8#/Rf4#
1...Qg1 2.Re1#/Nf8#
1...Qe7 2.Ree5#/Re6#/Rxe7#[E]
1...Qb6 2.Rb4#[J]/Nf8#
but 1...Qa3!
1.Rc3[B]! (2.Re5#[A])
1...Qb4[a] 2.Rxb4#[J]
1...Kxh7[b] 2.Re7#[E]
1...Qe3[c] 2.Rexe3#[L]
1...Qxg5[d] 2.Rg4#[K]
1...Qc4 2.Rexc4#/Nf8#
1...Qxc3/Qb5/Qd5/Qf5 2.Nf8#
1...Qd4 2.Rxd4#/Nf8#
1...Qf2 2.Rf4#/Nf8#
1...Qg1 2.Re1#/Nf8#
1...Qd6 2.Rd4#
1...Qb6 2.Rb4#[J]/Nf8#