1.Bc2! [1.e7? Rh8 2.Bc2 Nc5+ 3.Rxc5 Rxb7=; 1.Be4? Rh8=]

1...Nc5+! [1...Rxb7 2.Re4+ Kc3 3.Bxa4+-]

2.Rxc5 Rxb7 [2...Kxc5 3.Bxb3+-]

3.Nd6!

[thematic try: 3.Nxa5? Kxc5 4.Nxb7+ Kd5 5.Bb3+ Kc6 6.Ba4+ Kc7 7.e7 Rh6+! 8.Ka7 Re6 9.e8N+!? Kc8 10.Ned6+ Kc7 11.Nb5+ Kc8 12.Bc2 Rf6/Re5 13.Bf5+?! Rxf5= position X;

3.Kxb7? Kxc5=]

3...Kxc5 4.Nxb7+ Kd5

[4...Kb4 5.Nd6 a4 6.e7 Rh8 7.Bg6 a3 8.Bf7 Kc3 9.Kb5

(9.Kb7? Kc2!=) 9...Rb8+ 10.Kc6! Rh8 (10...Kc2 11.Nb7 Rh8 12.Nc5+-)

11.Kc5! Rb8 12.Nb7! Rh8 13.Na5 Kb2 14.Nc4++-]

5.Bb3+ Kc6

6.Ba4+ Kc7

7.e7 Rh6+!

8.Ka7 Re6!

9.e8N+! [9.e8Q? Ra6+! 10.Kxa6 stalemate]

9...Kc8

10.Ned6+ Kc7

11.Nb5+ Kc8

12.Bc2! switchback [loss of time 12.Bd1?! Rg6 13.Bc2 Rf6]

12...Rf6 13.Bf5+! Rxf5 position X with bPa5

14.N7d6+ Kd7

15.Nxf5 a4

16.Na3+- win after Troitzky