No.587 
Stephan Dietrich (Germany)

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Original Problems, Julia’s Fairies – 2014 (II): May – August

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No.587 by Stephan Dietrich – An aristocratic Miniature with two fairy conditions! (JV)


Definitions:

Functionary Chess: A piece can move only if it is threatened.

Annan Chess: Units move normally except when they are standing one square directly in front of another unit of the same color, when they move with the power of the rear unit. In the starting position, all pawns (black & white) move with the power of the piece behind them, e.g. 1. Pc2xh7 (as bishop).


No.587 Stephan Dietrich
Germany

original – 22.08.2014

Solution: (click to show/hide)

white Kh1 Sf1 Be1 black Kh3 Sg2 Rf5

hs#3          b) wSf1→g4          (3+3)
Annan Chess
Functionary Chess


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seetharaman
seetharaman
6 years ago

In the final position, why white cannot play 4.Kg1?

Geoff Foster
Geoff Foster
6 years ago
Reply to  seetharaman

Is it a bug in Popeye? If you consider just Functionary Chess, then the wK is not threatened and so cannot move. However when combined with Annan Chess the wK actually is threatened (which is why it is mate!). It would be good to test the problem with WinChloe, but does it support Functionary Chess?

seetharaman
seetharaman
6 years ago
Reply to  Geoff Foster

Thanks Geoff Foster. Since I have not worked on either of these two fairy conditions, I thought that I was missing some point of the problem.

dupont
dupont
6 years ago
Reply to  Geoff Foster

Yes it supports, and actually the problem is C+ WinChloe.

seetharaman
seetharaman
6 years ago
Reply to  dupont

Is that a bug in Winchloe also? Is the problem sound ?

dupont
dupont
6 years ago

The question is whether or not wKh1 is observed by bKg3. Both programs answer is it not, so wKh1 is paralized and hence checkmated because attacked by bKg3 (thanks to the Annan condition).

This is a matter a convention, but there is some underlying logic here: The condition Annan tells that bKg3 is moving like a Knight, not that it is a Knight… So one may argue that wKh1 is not observed “directly” by bKg3 (although it is attacked by bKg3 equipped with Knight power)… Saying otherwise, it seems that, for both programs, “observation” is taken in the orthodox sense.

dupont
dupont
6 years ago

Oh sorry, please forget my previous post, this is nonsense! In Annan chess things are going the other way for black. Thus in the final position of a) the wKh1 is threatened by bSg2 moving as a King! (not by bKg3 moving as a Knight)… Hence it is clear why wKh1 can’t play to g1.

Btw note that bKg3 is not threatened by wBe1 as this Bishop is no more observed by bSg2, this latter moving now as a King…

seetharaman
seetharaman
6 years ago
Reply to  dupont

Thanks. I was confused as which one is the front piece. This seems to differ for white and black !

dupont
dupont
6 years ago
Reply to  seetharaman

Yes! A good trick concerning the Annan condition is to remember that, in the initial game array, Pawn moves are fairy (either black or white)…

Nikola Predrag
Nikola Predrag
6 years ago

So in the mate of a), bK moves as R but this is not transferred to bSg2 which moves as bK, checking wK and guarding g1&h2?

seetharaman
seetharaman
6 years ago
Reply to  Nikola Predrag

It seems so 🙂 So, the King is still King temporarily moving like rook !

dupont
dupont
6 years ago
Reply to  Nikola Predrag

Yes, with vertical black pieces ABC, C is moving like B (and not like A although B is moving like A).

Paul Rãican
Paul Rãican
6 years ago

The complete definition of Annan (or Southern) Chess: A unit (incl.King) one square in front of a friendly unit moves in the manner of the rear unit, not as itself. For White, affected units are on the same file and one rank higher, for Black they are one rank lower. Transference of powers is only to the next unit: with 3 friendly units adjacent in a file, the 3rd moves as the 2nd, the 2nd moves as the 1st and the 1st is unaffected. A white Pawn on the first rank is immobile.