1.exd7? ~ 2.Rxf2#

but: 1...Qd1! (a)

1.Qb8? Qd1 (a) 2.Qg3#

but: 1...Sd1! (b)

1.Qa8? Qd1 (a) 2.Qf3#

1...Sd1 (b) 2.Rf2# (Umnov)

but: 1...d5!

1.Qg6! ~ 2.Qg3#

1...Sd1 (b) (S~?) 2.Qxf5#

1...Se4! 2.Rf2# (Umnov)

1...Bxd2 2.Re1# (Umnov)

Umnov, Kharkov-2 doubled on the same square, black correction, white option, battery mates.