1.Sd3 Kg4

1...Rd1 2.Kc4 Kg4 3.Kc3 Kg3 4.Re3 main

2.Kb4!!

2.Rg8+? Kh5!! 3.Rh8+ Kg6 (3...Kg5? 4.Re8=) 4.Se5+ Kg7-+;

2.Re4+? Kg3-+;

2.Kc4? e1Q 3.Sxe1 f2-+

2...Rd1 3.Kc3 Kg3 4.Re3!

4.Kc2? Kh2!!-+ see the try of main B after 8.Re6?* ... 12....Kh2!!

A) 4...Kg2 5.Kc2!

5.Sf4+? Kf2-+;

5.Se5? e1Q+-+ (5...e1B+? 6.Kc2 Rd2+ 7.Kc1 f2 8.Sf3=)

5...Ra1 6.Kd2!

6.Kc3? Ra2 (6...Ra3+? 7.Kd2 Kg3 main B (7...f2 8.Sf4+=) 8.Re5) 7.Se1+ Kf2-+

6...Ra2+ 7.Ke1! Kg3! 8.Sc1!

8.Re8? Ra1+ 9.Kd2 Rd1+-+

8...Ra1 9.Kd2

9.Rc3? Kg2-+

9...Kf2 10.Sd3+

10.Rxf3+? Kxf3 11.Sxe2 Ra2+-+

10...Kg3 11.Sc1! Switchback

11.Re5? Rd1+-+;

11.Kc2? Ra2+ 12.Kb3 (12.Kb1 Rd2-+; 12.Kc1 Kg2-+) 12...Rd2 13.Kc3 Rd1 14.Kc2 Kg2 15.Sf4+ Kf2-+

11...Kf2 12.Sd3+ perpetual check.

12.Sxe2? Ra2+-+; 12.Rxe2+ fxe2 13.Sxe2 Ra2+-+

B) 4...Ra1 5.Kd2!

5.Kb2? Ra8 6.Kc3 Ra2 7.Kb3 Rd2 8.Kc3 Rd1 9.Kc2 Kg2-+

5...Ra2+ 6.Ke1 Ra1+ (6...Kg2 7.Sf4+=) 7.Kd2 positional draw, or 7...Ra3 8.Re5!!

*8.Re6? Ra2+ 9.Ke1 Ra1+ 10.Kd2 Rd1+ 11.Kc2 Kh2!! 12.Re3 Kg2 13.Kc3 Kg1! 14.Rxf3 Rxd3+-+

8...Ra2+ 9.Ke3 e1Q+ 10.Sxe1 Re2+ 11.Kd4 Rxe5 (11...f2 12.Rxe2=) 12.Sxf3=