[Retros] Pf2->B ?

[CAILLAUDM at aol.com]

 Hello, 

 This combination is the only one among the theoritically possible ones that 
have not yet been achieved or even attempted to (perhaps the most 
difficult?).
 For the record, here is the nearest I could go with black King standing in 
check with only one flight :

 Pf2->B no mate! : 1.f4 4.Kh4 5.g3 7.Be6 8.Nh3 10.Qxa7 11.Qxa8 13.Qf3 16.a6 
19.Rxf7
                            20.Rf5 21.Bxg8 22.Ba2 23.b3 25.Bxe7 26.Rc5 28.f6 
29.Bxf8
                            31.Bxc7 32.Bxd8 33.fxg7 34.g8=B 37.Bh5+ 
(35.Bf7+ checks earlier but with 2 flights to bK, so it is not the nearest to 
the mate!)

 Anyone has an idea to get the mate?

 Best,
   Michel
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