1.f5 Kg5 2.Kf7! [2.Kg7? Kf4+! 3.Kf6 h5= (3...Rg8=) ; 2.Ke7? Rb4! 3.f6+ Kg6=] 2...Rb4! [2...Kh6 3.Rb5+-] 3.f6+ Kh6 [3...Kg4 4.Kg7 Rxb3 5.Kxh7+-] 4.Re6!! Ambush move. Passive pawn sacrifice on b3. [4.Kf8? too early. 4...Kg6! 5.f7 Kf6! 6.Kg8 (6.Re3 Rb8+!=) 6...Rg4+!=; 4.Re3? Rb7+ 5.Kf8 Kg6!=; 4.Re8? Rb7+ 5.Kg8 Kg6!=] Variation A: 4...Rxb3 [Variation B: 4...Rb8 5.b4! Active pawn sacrifice. 5...Rxb4 6.Kf8! Kg5 7.Kg8! (or 7.f7 h5 8.Kg8! moves inversion) 7...h5 (7...Rb8+ 8.Kxh7!+-) 8.f7 Rf4 9.Re5+!  9...Kg4 (9...Kg6 10.f8Q! Rxf8+ 11.Kxf8+- Well known winning position with wR on 5th rank.) 10.Re4!! Pinning again. Chameleon echo.; 4...Rb7+? 5.Kf8! Rb8+ 6.Re8+-] 5.Kf8! Now it works. Switchback. 5...Kg5! Switchback again [5...Kg6 6.f7+!+-] 6.Kg7! [6.f7? h5! 7.Kg8 (7.Kg7 Rb7! 8.Rg6+ Kf4= or 8....Kf5=, but not 8....Kh4? +-) 7...Rf3! 8.Re5+ Kg4 9.Re4+ Kg5!=] 6...h5 7.Re5+! One more switchback 7...Kg4 8.Kg6! h4 [8...Rb6 9.Rg5+!+-] 9.Re4+! [9.f7? Rb6+=] 9...Kg3 10.f7! only now it works 10...Rf3 [10...Rb8 11.Re8! Rb6+ 12.Kf5! Rb5+ 13. Re5! Rb8 14. Re3+! Kg2 15.Re8!+-] 11.Re3!!+- Pinning 1–0