JT “PIV-90”

Direct two-movers with black promotions to fairy pieces leading to mates with white promotions to fairy pieces. The key and threat (if any) must not be promotions. The position has to be legal, i.e. possible in a game with P promotions allowed to the fairy piece(s) used in the problem. Any fairy pieces allowed, but no fairy conditions

Prizes in chess literature | Judges: Kjell Widlert and Valeriu I. Petrovici | Sendings until 30.11.2021 to d.i.nicula@gmail.com


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Hubert Gockel
Hubert Gockel
September 26, 2021 13:20

An example is: Yves Cheylan, #2, 2nd prize, Boyer MT, 1988 (reprinted in The Problemist, Sep. 2021, diagram 25, p.187).

Joost de Heer
Joost de Heer
September 27, 2021 08:30
Reply to  Hubert Gockel

This is the diagram:
comment image
#2 (d1=Rose, g8/h8=Leo)

1.LEç4! [2.Fd4‡]
1…b1=RO 2.b8=RO
1…b1=LE 2.b8=LE
(1…b1=D 2.LEf1‡
1…R×g4 2.Fé4‡
1…é×f2 2.b8=LE‡
1…b1=F 2.b8=LE,LEf1‡)

Last edited 2 months ago by Joost de Heer
Seetharaman
Seetharaman
September 29, 2021 08:54
Reply to  Joost de Heer

It is not immediately obvious that 1…b1~ opens guard to the flight g4 (by the Rose d1) allowing the two promotion mates! Nice idea!

Last edited 2 months ago by Seetharaman
Joost de Heer
Joost de Heer
September 27, 2021 10:51

Is a magic piece a fairy piece? In other words, is https://pdb.dieschwalbe.de/P1315393 thematic?

shankar ram
shankar ram
September 28, 2021 13:28
Reply to  Joost de Heer

“Magicalness” is an attribute. So, strictly speaking, promotion to magic pieces can only happen with (already) magic pawns. But see my suggested workaround (https://juliasfairies.com/jt-piv90/#comment-52860)!

Last edited 2 months ago by shankar ram
shankar ram
shankar ram
September 28, 2021 13:05

As noted in the FCCP, the properties of most conditions and boards can be applied to specific pieces to create new types of pieces. WinChloe has many such examples. This would effectively bypass the restriction on fairy conditions!

shankar ram
shankar ram
September 28, 2021 13:09

The requirement of a “legal” position, where any fairy piece must have come about by promotion is interesting. This rules out things like Alfils, Equihoppers and Dabbabas on odd-numbered ranks!

shankar ram
shankar ram
September 28, 2021 13:19

Fairy Pieces with “attributes” like neutrality, paralysis, transparency, “chameleon-ness” are also ruled out, since promotions to such pieces can only take place by pawns already having such attributes. And how does one get pawns with attributes by promoting “normal” pawns? 😉
The only way would be to state a (new) rule that pieces with attributes can appear by promoting normal pawns! This is also required for the possibility mentioned in my first post. The new rule would also require that there be no pawns present with attributes!

Last edited 2 months ago by shankar ram
Seetharaman
Seetharaman
September 29, 2021 08:36

Whose Jubilee it is? PIV is quite cryptic

Kjell Widlert
Kjell Widlert
September 30, 2021 02:08
Reply to  Seetharaman

It’s the jubilee of one of the judges, Valeriu I. Petrovici (“VIP”). Don’t ask me why the initials are written backwards.