1.Bc4

1...R~ 2.Bb5, Qb3, Sb2

1...Rxd1 2.Bb5, Qb3

1...Rb5 2.Bxb5

1...Rb3 2.Qxb3

1...Rb2 2.Sxb2

1...Rb4 2.Qa1

1...b5 2.Qa5

Progressive reduction of secondary threats

Two elimination mates