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No.703, 704 |
Original Problems, Julia’s Fairies – 2015 (I): January – June →Previous ; →Next ; →List 2015(I) Please send your original fairy problems to: julia@juliasfairies.com |
Two problems by Thomas Pantalacci:
- No.703 – Zilahi-theme with special effects;
- No.704 – Typical effects of Patrol Chess! (JV)
Definitions:
Patrol Chess (Patrouille): A piece can capture or give check only if it is observed by a piece of its own side.
Provocation Chess (Provocateurs): A piece can capture only if it is threatened.
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No.703 Thomas Pantalacci |
Solutions: (click to show/hide) |
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white Pd5 Kd3 Re7 Sg8 Bg1
black Qe8 Pg7f6e5 Kf5 Rd6 Sg6
h#2 b) Pd5→h3 (5+7) |
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No.704 Thomas Pantalacci |
Solutions: (click to show/hide) |
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white Sb4 Pe3g4 Ka1 Rg6 Bh6
black Pf6d7 Bb7 Rf7e8 Ke4
h#2,5 b) Sb4→a6 (6+6) |
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An interesting demonstration of the similarities and differences between Provocation Chess and Patrol Chess: in the first one, a piece must be observed by one of the opponent’s pieces in order to capture; in the second one, it must be observed by one of his own pieces.
703: the bQ must capture Re7 (so that Pg7 is no longer observed) or Sg8 (so that Pf6 is no longer observed), and must then itself observe the wB so that it can guard flights.
704: the white Grimshaw on g5 temporarily inactivates a WP, allowing a bK move followed by a block on his original square and a sort of battery mate. Both mates are models, even though they don’t look like it.
But one feature doesn’t quite work the way one could hope for: in b), 2.Be4? fails only because the bK is activated (allowing him to capture one of three white pieces), but in a), 2.Re4? fails not only because the bK is activated, but also because 3.Rxe3 is possible.
Yes you’re right, it’s the defect I had also noticed, but I could not find a position in which the antidual on autoblocking is purely motivated (note that Re4 ? also failed because of Rf4 intercepting the bishop). So, this idea could be improved