Martin Minski (Германия)  
Win 4+2

Allumwandlung as twin study

 

Twin A) diagram

1.Kc8

[1.Kc6? Rd8! 2.Kc7 Ra8! 3.b5 Kg7=]

1...Ra7 2.Kb8!

[2.f8N+? Kh6! 3.Be8 Ra8+ 4.Kd7 Rb8=]

 

2...Re7 3.f8R!+-

[3.f8Q? Rb7+! 4.Kc8 Rb8+! 5.Kxb8 model stalemate;

3.f8B? Re5! 4.Bg4 Re8+ 5.Kc7 Rxf8=]  

 

2...Ra6/Ra4 3.f8B!+-

[3.f8Q? Ra8+! 4.Kxa8 model stalemate;

3.f8R? Rb6+ 4.Kc7 Rxb4=;

3.f8N+? Kh6! 4.b5 Rb6+ 5.Kc7 Rxb5=;

3.Kb7? Rf6!= ]

 

Twin B) wPb4 to d4

1.Kc8

[1.Kc6? Rd8! 2.Kc7 Ra8!=]

 

1...Ra7 2.f8N+!

[2.Kb8? Ra4! 3.Bd1 (3.f8Q Ra8+! 4.Kxa8 model stalemate; 3.f8B Rxd4=)

 3...Rb4+! 4.Ka7 Kg7=]

2...Kh6 3.Be8!

[3.Bf3? Rf7=;

3.Bg4? Ra8+ 4.Kc7 Rxf8=]

3...Ra8+ 4.Kd7+-

 

1...Rxd4/Rd6 2.f8Q! Rd8+ 3.Qxd8+-

[3.Kxd8? model stalemate]