1...Rb6!!
If [A] 1... a3 2.Kg6 Rg1+ 3.Kh6 Rh1+ and perpetual check, or [B] 1... Rf1 2.Rxb7 Rf8 3.Ra7 drawn
2.Kg6c5+
3.Kf5cxd4
4.Rxd5dxe3
And White resigned
Lopyshnoi-Dreev (1998)