[Retros] SPG Pa2/c2->B (Re: Pa2->B)

[Noam Elkies]

Jens Guballa joins the fray with:


> Promotion to bishop with pawn a2:



> SPG 6.5

> 1.a4 c5 2.a5 Nc6 3.a6 Qa5 4.axb7 Qa2 5.bxc8=B Qxb1 6.Rxa7 Nd8 7.Bxd7# 


Here's an approach that works equally for a2 or c2, also in 6.5:

1 a4(c4) h5 2 a5(c5) Rh6 3 a6(c6) Re6 4 ab(cb) f6 5 b:a8=B
Ba6 6 Be4 Bb5 7 Bg6#  (C+ in 20 msec.)

NDE