No.1492 
David L. Brown
(USA)

Warm welcome to David in Original problems of JF!

Original Fairy problems
JF-2020/I:
January – June’2020


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No.1492 David L. Brown
USA

original – 31.03.2020

Solution: (click to show/hide)

white Be2 Kc3 oc6a6g8 Pf4d4d2 Sh3b6 Rd8 black Qf2 Pf5 Ke4 Bg3 of6e8a8

#2                                            (11+7)
Orphans c6,a6,g8,f6,e8,a8


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Thomas Maeder
Thomas Maeder
April 1, 2020 00:57

the brackets after the two first mates should read:
[2…Qxd3? >a6>a8>c6]*

David L. Brown
David L. Brown
April 3, 2020 21:24

For lack of knowing the particular name, I’ve termed these Acidmates [for now] – a loose acronym for Arrival Check, Illegal Defense. Does this work?

Dmitri Turevski
Dmitri Turevski
April 4, 2020 11:29
Reply to  David L. Brown

There’s Juraj Lorinc’s h#2 with similar orphan chains, it seems that you have awarded it the first Prize in your jubilee tourney more than twenty years ago!

http://jurajlorinc.com/chess/m145_150.htm#uloha5

seetharaman kalyan
seetharaman kalyan
April 4, 2020 12:27

He is back after almost 20 years! ?

David L. Brown
David L. Brown
May 8, 2020 21:21

In search of a Name
Thanks to Dmitri Turevski, I see that the “Illegal Arrival” moves [Acidmates] in No.1492 are not new. Indeed, with follow-up with Juraj Lörinc, there are many thematic instances throughout history. Of note to me is Newman Guttman’s #2 [SG, 2002] with such a key and three defenses – he called these moves “repelling”. Yet, so far, no official name has been assigned, it seems. I was hoping that for future thematic reference, a discussion could determine a true keyword name. Can anyone suggest a suitable label for these illegal moves which we all can agree on?

seetharaman kalyan
seetharaman kalyan
May 11, 2020 08:59

Here the capture of the mating piece is an illegal selfcheck, due to an effect taking place after the capture. There are such features in many fairy conditions including the good old Circe and the later Isardam. Similar effects can be there in anti-circe, Kamikaze or PWC. Rather than naming the mate I would prefer a common name for such special illegal captures. Perhaps pieces enjoying such privilege/immunity can be called Acid pieces.