[Retros] Promotion: legal order of partial actions

[Valery Liskovets]

Mario Richter wrote:


> article by Lothar Finzer titled

> "Matt in weniger als einem Zug" ("Mate in less than one move").


A very interesting article, indeed.


> XI. Lothar Finzer, Original (i.e. Schwalbe Heft 8, April 1971)



> 3B3B/2bnPbPn/3ppkpp/5p2/5K2/r6r/P1PPPP1P/8

> w: Bd8 Bh8 Pe7 Pg7 Kf4 Pa2 Pc2 Pd2 Pe2 Pf2 Ph2

> b: Bc7 Nd7 Bf7 Nh7 Pd6 Pe6 Kf6 Pg6 Ph6 Pf5 Ra3 Rh3

> (11+12)

> White completes his last move, thereby checkmating Black.

>

> XII. Lothar Finzer, Original (i.e. Schwalbe Heft 8, April 1971)

> 1B6/6PP/4P3/4p3/5kPK/5P2/5PPp/7r

> w: Bb8 Pg7 Ph7 Pe6 Pg4 Kh4 Pf3 Pf2 Pg2

> b: Pe5 Kf4 Ph2 Rh1

> (9+4)

> Attention! Hands off from this position!

> The side claiming to have the move, will get mated.

> ...


Both problems implement a kind of partial Retroanalysis.
The former contains bP on c7. In general, it is sometimes difficult
to comprehend such problems without knowing author's intention
and/or getting his additional comments.

Valery Liskovets
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