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

[andrew buchanan]

I wondered about this possibility.

rnbR1k1r/pp2npbp/3p2p1/8/8/8/PPPBPPPP/RN2KBNR
PG in 6.5

is sound, but replace Rd8 with Q, and it falls apart.

The one that would impress me would have:
- exactly 2 distinct solutions in the Q twin
- no extraneous promoted pieces in either case

Cheers,
Andrew.

--- Hirokaz ONODA <glkoon at yahoo.co.jp> wrote:


> Hi Mario,

> 

> > > (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?

> 

> Very interesting.

> I think there must be some games, or maybe a lot?

> I'd like to see those games.

> 

> Amici Sumus,

> Hiro

> 

> 

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