[Retros] Pawn to-the-8th, single checkmates, simplified ed.

[Mario Richter]

> (1-1) promoted to Knight

> 

> 1.d4 c5 2.dxc5 d5 3.Qd4 Be6 4.Qf6 d4 5.Kd2 d3 6.Kc3 d2

> 7.b4 d1N# (Olli Heimo & Gianni Donati 1996)


This can be done faster:

rnbqk1nr/pppp1ppp/8/8/1b6/1P1P4/PKP1PPPP/RNBn1BNR
SPG 6.0

(rnb1kbnr/pp1ppppp/8/q7/3P4/1P6/PKP1PPPP/RNBn1BNR SPG 6.0
 works too, but I like the first more).


Same idea for Pe2-e1=N#

rn1qkbnr/ppp1pppp/8/8/6b1/4P1P1/PPPP1PKP/RNB1nBNR
SPG 6.0





> (1-4') Queening is MUST(underpromotion is insufficient)


Has somebody encountered the opposite situation:

Underpromotion is MUST, while queening leads to
a non-unique PG?


Regards

  mario