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MatPlus.Net Forum Competitions Christmas tourney 2009-2010
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(1) Posted by Michel Caillaud [Wednesday, Dec 23, 2009 00:07]

Christmas tourney 2009-2010

A tourney is organized in parallel to the International Solving Contest 2010. The theme chosen by the judges is a fairy condition, IMMUN chess
A capture is possible if the Circe rebirth square of the captured unit (Rex Exclusiv) is empty (after capturing).

Example :

Eligiusz ZIMMER
Problemkiste 2004
(= 3+2 )

Immun Chess
2 solutions

1.Qb3 Bf7 2.Qa4 Bb4‡
1.Kb3 Bb4 2.Qa4 Bf7‡

Other fairy conditions and pieces are accepted.

Section 1: All kinds of problems except Retros and Proof-games. Judge: Guy Sobrecases.

Section 2: Retro problems and Proof-games. Judge Michel Caillaud.

Send to the controller:
Eric Pichouron

Closing date : January 17th, 2010.

The awards will be announced at the end of the ISC, on January 24th, 2010.
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(2) Posted by Guy Sobrecases [Wednesday, Dec 23, 2009 15:41]

As the other fairy conditions are accepted, Immun chess Rexinclusiv problems are also welcome!
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(3) Posted by Cornel Pacurar [Thursday, Dec 24, 2009 00:23]

Interesting to note that the definition of Immun Chess in Dr. Hilmar Klaus' "Encyclopedia of Chess Language" ( is as follows:

Immunschach n Ein Stein inklusive König, dessen Ursprungsfeld (im Circe-Sinne) von einem anderen Stein besetzt ist, ist immun, kann also nicht geschlagen werden. [Er. Bartel, Jugendschach (27) X 1981 S. 72; Problemkiste (67) II 1990 S. 98] The captured unit is not reborn E

It seems that Immun Chess is by default "Rex Inclusive"! True, both Popeye ("After some of the Circe, Immun, Madrasi, Phantomchess or Genevachess conditions you can enter 'RexInclusiv'") and WinChloe (there is 'Immun' and 'Immun Rex Inclusiv') implementations are "Rex Exclusive", this being the standard.

This created quite an interesting situation earlier this year during Itamar Faybish's TT5 (Strict Circe series-movers -, when the problems in the Category E1 ended up being Circe Immun Rex Inclusive (in Popeye, the combination of Circe and Immunchess conditions results in StrictCirce)!

Something to keep in mind when composing Rex Inclusive problems for this tournament while using multiple fairy conditions, as they may be non-commutative (even though Juraj Lörinc commented somewhere in this forum that "current solving programs (at least here discussed Popeye and WinChloe) are treating fairy conditions put in for a problem as a set (not ordered), not a n-tuple or sequence (ordered). As set, there are internal rules for resolution of fairy condition interaction, specific for individual programs")!
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(4) Posted by Guy Sobrecases [Sunday, Dec 27, 2009 22:06]

Thanks Cornel. All that is very much interesting.
Winchloé and Popeye can solve Immun Chess Rexinclusiv, or Immun Chess (Rexexclusiv being considered as a standard by both softwares, as you mentionned).
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(5) Posted by Miodrag Mladenović [Sunday, Jan 24, 2010 18:51]

Michel wrote:
The awards will be announced at the end of the ISC, on January 24th, 2010.

Is award completed?
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(6) Posted by Guy Sobrecases [Sunday, Jan 24, 2010 19:40]

Yes, both awards are ready, and should be online very soon. Non-retros problems: tonight or tomorrow
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MatPlus.Net Forum Competitions Christmas tourney 2009-2010