Day Two of key rook and pawn endings. This one is by the great composer Grigoriev.
If you tried 1.Rb1 you lost: 1…Rb8 2.Kg5 Ke7 3.Kf4 Kd6 4.Ke3 Kc5 5.Kd3 Kb4 6.Kd2 Rd8+ 7.Kc1 Kc3 8.Rb2 Rd1+ 9.Kxd1 Kxb2; and if your tried 1.Re1 you lost: Re8 2.Rb1 Rb8 3.Kg5 with the same as the last What draws is 1.Kg5 Ke7 2.Kf4 Kd6 3.Ke3 Kc5 4.Kd2 Kb4 5.Kc1 Ka3 [5...Ra1+?? 6.Kb2 Rxg1 Stalemate! Now there's a trick worth remembering!] 6.Kb1 Re8 7.Rd1 and drawn.