Thr. 1...Sb3#
1.b5!
1.Rf7+? Bb7 2.b5 Sb3+-+ (2...g2? 3.b6+=)
1...g2
1...Sb3+ 2.Kb4
2.Ka4? g2 3.Rg5 Sc5+-+
2...g2 3.Rg5=
2.Rg5!
2.Rf7+? Kb8!! 3.Rg7 (3.Rf8+? Kc7-+) 3...Bf3!
a) 3...Bd5? 4.Kb4 Sc2+ 5.Kc3 Se3 (5...Se1 6.Kd4=) 6.Kd2= (6.Kd3? Sf5 7.Rg5 Bf3! 8.Kd2 Sh6! 9.Ke1 Sg4-+) ;
b) 3...Bb7? 4.Kb6! Bd5 5.Kc5=; 4.Rg8+ Kb7! (4...Kc7? 5.b6+ Kd7 (5...Kc6 6.Rg7 Sb3+ (6...Kd6 7.Kb4 Sc2+ 8.Kc3=; 6...Kc5 7.Ka6=) 7.Kb4=) 6.Kb4 main) 5.Rg7+ Kc8 6.Rg8+ Kd7 7.Kb4 Sc2+ 8.Kc3 Se3-+
2...Bf3 3.b6+!
3.Kb4? Sc2+ 4.Kc3 Se3-+; 3.Rg7+? Kb8 4.Rg8+ Kb7-+ see the play after 2.Rf7+?
3...Kb7 4.Rg7+!
4.Kb4? Sc2+ 5.Kc5 Se3 (5...Ka6? 6.Rg7 Bb7 7.Rg4! Ka5 8.Rg5! Ka4 9.Rg4+ Ka5 10.Rg5 positional draw) 6.Rg7+ Kc8 7.Rg8+ Kd7-+
4...Kc8 5.Rg8+!!
5.Ka6? Sb3! (5...Bd5? 6.Ka7! Sb3 7.b7+ Bxb7 8.Rg8+ Kc7 9.Rg7+ Kc8 10.Rg8+ perpetual check) 6.Rg8+ Kd7 7.b7 Sc5+-+
5...Kb7 6.Rg7+ Kc8 7.Rg8+ perpetual check, or 7...Kd7 8.Kb4!
8.Ka6? Sb3 9.b7 Sc5+-+; 8.Rg7+? Ke6! (8...Ke8? 9.Kb4 Sc2+ 10.Kc3= (10.Kc4? Se3+ 11.Kd3 Sf5 12.Rg5 Kd7! 13.Kd2 Sh6 14.Rg7+ (14.Ke1 Sg4-+) 14...Kc8! 15.Rc7+ Kb8! 16.Rc1 Sg4-+) ) 9.Ka6 Sb3 10.b7 Sc5+-+
8...Sc2+ 9.Kc3 Se3 10.b7!! Bxb7 11.Kd2!=
11.Kd3? Sd5!! 12.Rxg2 Sf4+!-+
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