[Retros] Shortest Knight Double Checkmates

[Hirokaz ONODA]

Hi,

Knight to the 6th rank

 1. Cb1-c3   Pe7-e6     2. Cc3-d5   Dd8-e7     3. Pc2-c3   Re8-d8    
 4. Dd1-a4   De7-e8     5. Cd5-e7   Cb8-c6     6. Da4-h4   Cc6-e5    
 7. Ce7-c6   
captureless

 1. Pa2-a4   Cb8-c6     2. Pa4-a5   Cc6xa5     3. Pd2-d3   Pc7-c6    
 4. Fc1-g5   Dd8-b6     5. Re1-d2   Ca5-c4     6. Rd2-c1   Cc4-d2    
 7. Pf2-f4   Db6-e3     8. Cg1-f3   Cd2-b3    

 1. Pd2-d3   Pe7-e5     2. Fc1-f4   Pe5xf4     3. Re1-d2   Pf4-f3    
 4. Rd2-c1   Pf3xg2     5. Cg1-f3   Pg2xf1=C   6. Th1-g1   Cf1-d2    
 7. Tg1xg7   Dd8-g5     8. Tg7xg8   Cd2-b3    
invisible

 1. Pd2-d4   Pb7-b5     2. Pd4-d5   Pb5-b4     3. Pd5-d6   Pb4-b3    
 4. Pd6xe7   Pb3xc2     5. Pe7xf8=C Pc2xb1=F   6. Cf8-g6   Fb1-f5    
 7. Cg6-e7   Re8-f8     8. Dd1-d6   Dd8-e8     9. Ce7-g6   
invisible

Knight to the 8th rank
 1. Pa2-a4   Pc7-c6     2. Pa4-a5   Dd8-b6     3. Pa5xb6   Pa7-a6    
 4. Ta1xa6   Ta8-a7     5. Pb6xa7   Pe7-e6     6. Pa7-a8=C Ff8-b4    
 7. Ca8-b6   Fb4xd2     8. Fc1xd2   Re8-d8     9. Fd2-a5   Rd8-c7    
10. Cb6-a8   

Hiro


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