(31.05.2013) I am glad to introduce you the new fairy condition Circe X! Here you can see the definition, schemes, example and the opinion of some composers.

Circe X

     Definition:  as a normal Circe - captured units (not Ks) reappear on their game-array squares, of the same colour (pieces), on the file of capture (pawns), or on the capture file’s promotion square (fairy pieces), but if the rebirth square is already occupied by another piece (A) it must immediately move (without capturing) vacating the square for landing of the captured piece (B). The capturing side decides where the piece A should move. If  there is not possible legal movement, the capture is not allowed (or possible variation – the captured piece disappearing).

Proca retractor: white retracts n moves to reach a position for a normal problem (usually a #1). White must retract a legal move, Black defends by retiring any move he wishes. If a capture is retracted, the capturer decides if and which piece was captured.

a) 1.c1Q+! Kxc1(wBf6, bQd8) 2.Qxa5(wPa2) e6#

[3.Kxa2(bK~?, wPa2)?? Selfcheck]

b) 1.c1S! Kxc1(wBa7, bSb8) 2.Sxa6(wPa2) Bd4#

[3.Kxa2(bK~?, wPa2)?? Selfcheck] 

P.S. This type of condition may be applied also to other types of Circe:

Anti Circe X, Super Circe X, Anti Super Circe X, Circe Cage X etc.

Vlaicu Crisan: “Circe X - seems an interesting and original idea at the first glance. Pongracz Circe was the first fairy condition where the piece on the rebirth square was also reborn - which could lead to a rebirth chain. Circe X is different, as it mixes the rebirth of captured piece with an Anti Take&Make move of the piece occupying the rebirth square.

Hope to be able to investigate more this fairy condition in due course.”

Krassimir Gandev: “Circe X looks interesting. I hope that it can be included in some Chess problem solving program.”

Chris Feather: “My initial reaction is that Circe X is a brilliant, dynamic idea, all the better for being relatively simple. When one sees an idea like this, one immediately wonders why it has not been thought of before! Of course only practice and experience can show us exactly what possibilities it offers, but your examples give a good first impression and the idea certainly looks very promising. In addition to your h#2 example I especially like the effect in scheme 3; the promotion in scheme 4 also shows an intriguing possibility.

The thought of applying this condition to SuperCirce leaves me dizzy – it will surely be necessary to have some way to computer-test Circe-X problems!” 

I will be happy if you also share your opinion or Circe X problems!