1.a5 Rxb4 2.a6!! [2.Rxb4 Kxb4 3.a6 Kb5 4.a7 Kb6 5.Kb8 Rh1 6.a8N+ Kc6-+ 7.Ka7 Rb1-+] 2...Ra1 [2...Rxb6 3.a7=] 3.Rxb4 [3.a7] 3...Kxb4 4.a7 Kb5 5.Kb7=
