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Problem 521 & 521.1: Valerio Agostini, Antonio Garofalo & Seetharaman Kalyan - Fairy (Kamikaze, NightriderHopper, ContraRookHopper)
valerio.agostiniantonio.garofaloseetharaman.kalyan(04.02.2015) Nice fairy problem with ODT, change of functions and open of lines by Valerio Agostini and Antonio Garofalo.
An update: a version 521.1 with co-author Seetharaman Kalyan is included.
1.CRc5 kBxf6 2.kNHxe4 kRf4#
1.CRc4 kRxf6 2.kNHxd6 kBe7#
Kamikaze: Pieces disappear from the board when they capture.
ContraRookHopper: Moves like on Rook lines, but only hopping over a hurdle which must be adjacent to the contrahopper and may land anywhere on the line beyond.
NightriderHopper: Hops, on a straight line of knight moves, to the next square beyond any one unit, e.g. NHa1-g4, provided that c2 is vacant and e3 occupied.


0 #1 Seetharaman Kalyan 2015-02-04 14:05
This is a nice problem, but I do not like the capture of the stationary black queen by white.

I also wonder if the nightrider hoppers are really essential to the theme. They are used only to force the black move order. The white pawns d6/e4 can be captured by any kamikaze black piece or pawn and the solution will work.

Here is one possibility without these unwanted features. B1 moves are now pure selfblocks.

white Pc5d3 Ke7 Rf2
white Kamikaze rf7 bh2
black rlb7 Pa4f4 Ka3
black Kamikaze qb5

1.RLb7-b3 kRf7*f4[-wkRf4]
2.kQb5*c5[-bkQc5] kBh2-d6 #

1.RLb7-b4 kBh2*f4[-wkBf4]
2.kQb5*d3[-bkQd3] kRf7-f3 #
+2 #2 Antonio Garofalo 2015-02-11 11:16
An interesting version indeed, many thanks! We would be happy for a joint works if you agree.
0 #3 Seetharaman Kalyan 2015-02-11 17:07
Thanks Antonio. My version was just a suggestion. Basically, this scheme involves selfblocks and mates on the lateral/diagonal which is opened by black/white.

If you have no further suggestions to improve the strategy, you are welcome to publish it as joint effort.
0 #4 Diyan Kostadinov 2015-02-19 22:38
The version is now published.

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