Julia's Fairies

No.576,577 (NP)

No.576, 577 
Nikola Predrag


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

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No.576, 577 by Nikola Predrag – Two serial Disparate problems with logical motivations. Author writes that the idea came out of a discussion with Mario Parrinello (to No.569) about “virtual orthodox pin” in Disparate problems. So, one problem is dedicated to Mario, but the other one – to your editor, as I like Chameleons :).  Thank you, Nikola! (JV)


Disparate: If one side makes a move with a piece of type “x” (black, white, neutral, half-neutral, etc., King included), the other side cannot answer immediately by moving a piece of the same type “x”. (For example: white Qc1, black Ka8,Qa7 – mate in 1 move. After 1.Qc8#, Black is mated because 1…Qb8? is illegal. The mate is possible also with the neutral nQc1 – after 1.nQc8#. Black cannot move the same neutral Queen.) Every Pawn’s promotion is a Pawn’s move, therefore after such promotion (into any possible piece) the other side cannot answer immediately with its Pawn. We can say that after the move of the figure of type “x” any enemy figure of type “x” falls under Half-moving paralysis. This paralysis disappears immediately on the next half-move, if the opponent plays with another piece of type “y”. (This way it is implemented in Popeye. Another implementation of Disparate you can find in WinChloe, but it is based on the different rules. )

Chameleon: On completing a move, a Chameleon (from classical standard type) changes into another piece, in the sequence Q-S-B-R-Q… Promotion may be to a chameleon at any stage in the cycle.

No.576 Nikola Predrag

original – 24.07.2014
Dedicated to Mario Parrinello

Hints: (click to show/hide)

White Kf2 Re5 Bc7 Pc5 Ph2 Pd7 Pf4 Ph4 Pf3 Pb6 Pg5 Black Ka5 Bh5 Pa7 Pa6 Pg6 Pf5 Ph3 Black Chameleon Qc1

ser-hs#7                                  (11+8)
Disparate (Py)
Chameleon Qc1

Solution: (click to show/hide)

No.577 Nikola Predrag

original – 24.07.2014
Dedicated to Julia Vysotska

Solution: (click to show/hide)

White Kb8 Rf6 Bb7 Bd4 Pa7 Pf4 Pg4 Pe3 Black Kf2 Pg6 Pg5 Black Chameleon Sd5

ser-hs#6                                  (8+4)
Disparate (Py)
Chameleon Sd5

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Petko Petkov
Petko Petkov
July 25, 2014 22:30

№ 577 – A very pleasant Disparate (Py) problem in which the chameleon is used with logical motivation – such ideas merit special attention to this arena! Congratulations, Nikola!
In my opinion № 576 is also interesting in content, but the construction seems to me unduly heavy.

Nikola Predrag
Nikola Predrag
July 26, 2014 01:27
Reply to  Petko Petkov

Thanks Mr.Petkov, No.576 was the first of 6 versions. I tried to achieve Meredith. But the first version shows more logic tries and pure Disparate motivation for the capture of wR. So I sent both for publication.

A variation of No.576 with additional wRa7 (wPa7 to a6) would show incarceration of that Rook after 5…Ka8.
6.cBg8=cR# is played by cB and paralyzes wBb7 and wRa7 can’t move to paralyze the chameleon in the new phase.

This would of course be a completely artificial thematic motivation. A try in the single white move could add some detail to the content but my attempt was not convincing:

White Kc7 Pf7 Pa6 Rb6 Bc6 Rf6 Ph6 Pb5 Bd4 Pf4 Pe3 Pg3
Black Rh8 Ph7 Pg5 Pg4 Kf2
Black chameleon Qb2
ser-hs#7; Condition Disparate
1.cQc2=cS 2.cSxe3=cB 3.cBxf4=cR 4.cRd4=cQ 5.cQxf6=cS 6.cSg8=cB Kb7!(Kb8/c8/d8?) 7.cBxf7=cR#

Anyway, the specialists for series-movers should explore the possibilities of Disparate in that genre.

Nikola Predrag
Nikola Predrag
July 26, 2014 01:32
Reply to  Nikola Predrag

Correction of the mistake in previous post:
“A variation of No.577 with additional wRa7…”
is correct (No.576 is wrong).

Mario Parrinello
Mario Parrinello
July 26, 2014 09:47

Despite the crowded position (no.576) with too many pawns, the play is very interesting. The tries emphasizes the logic of the manoeuvre and the Disparate effects are spectacular, especially the so-called “virtual self pins”. I believe that the use of Chameleons are very suitable for this fairy condition as series-problems are (though they are not my cup of tea…).

Nikola, thank you so much for the dedication!

Nikola Predrag
Nikola Predrag
July 26, 2014 17:39

Mario, it was a great pleasure to me!
There’s some potential in that idea without the Chameleons.
No.579 shows a transformation of “virtual pin” into a real pin of a sibling-piece.
I’ve added a new comment and example on the page of No.569, to show more possibilities of the idea:

Would love your thoughts, please comment.x