Try: 1. Rb7?+

1...Kc4 2.Qf4 [A]

But 1...Ka4!

Try: 1.Qe6?

But 1...a4!

Try: 1.Qa6 [E] +?

1...Ka4 2.Qxa5 [D]

But 1...Kb4!

Try: 1.Rh4? [2.Rb7, Qa6 [E] ]

But 1...c4!

Try: 1.Kc3?

1...a4 2.Qa6 [E]

But 1...Ka4!

Solution: 1.Qe3

1...Kb6 2.Qxc5 [C]

1...Kc4 2.Qxc5 [C]

1...Kc6 2.Qxc5 [C]

1...a4 2.Qxc5 [C]

1...Kb4 2.Qb3 [B]

1...Ka4 2.Qb3 [B]

L-theme x4

Qa6 = try, threat, and mate - Urania