Fairy chess composition
 No.1249 Jacques Rotenberg (France/Israel) Warm welcome to Jacques in Original problems section of JF! Original Fairy problems JF-10/2017-3/2018: October’2017 – March’2018

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 No.1249 Jacques Rotenberg France/Israel original – 13.11.2017 Dedicated to Seetharaman Kalyan Solution: (click to show/hide) White Kf3 Qb4 Rf6 Bh8 Sf8g3 Pg7d6g6g4 Black Kh6 Rd4 Bb8d1 Pc5 #2                                               (10+5) Superguards 1.Kf3-f4 ? threat: 2.g7-g8=S # {(2.g5? Kh5!)} 1...Rd4-d5 {a} 2.Sg3-f5 # {A} 1...Bd1-b3 {b} 2.g4-g5 # {B} but 1...Rd4-d2 ! 1.Sf8-h7 ! threat: 2.g7-g8=S # {(2.g5? Rh4!)} 1...Rd4-d5 {a} 2.g4-g5 # {B} 1...Bd1-b3 {b} 2.Sg3-f5 # {A} 1...Rd4-f4 + 2.Qb4*f4 # 1...Rd4-d2 2.Qb4*d2 # { other tries:} 1.Rf6-f5 ? threat: 2.g7-g8=S # 1...Bd1-b3 2.Rf5-h5 # but 1...Bb8*d6 ! 1.Sf8-e6 ? threat: 2.g7-g8=S # but 1...Bb8*d6 ! 1.Sg3-e4 ? threat: 2.Qb4-d2 # 2.g7-g8=S # but 1...Rd4-d5 !{ (C+ by Popeye 4.79)}

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Georgy Evseev
November 15, 2017 15:39

Good, non-standard motivations, but the flight g5 taken by the key in both thematic phases looks very gaping.

I understand that Kg5# looks like very organic dual if this square is guarded, but still the position simply asks to find the form of setplay+solution, even though this does not seem to be easy.

Jacques Rotenberg
November 16, 2017 00:25

Thank you Georgy for your comment.
I agree with you that it could be better to avoid flight taking keys, but I think it’s not that important here.
In any case, if you want to propose a version, please do!

seetharaman
November 16, 2017 13:06

Thanks Jaques Rotenberg for your dedication. It is superb idea with an unusual motivation for the reciprocal change. In view of the excellent use of the fairy condition for the change and since the try also takes the flight, I suppose flight taking key is excusable. However I wonder if the added tries add extra value.

Jacques Rotenberg
November 17, 2017 09:51

Thank you Seetharaman Kalyan for that wonderful invention! and for the very interesting tournament you organized.

Here are, in my vue, the reasons why the tries have to be shown:
a) this bunch of flight taking tries shows more than many words that the flight taking key does not induce here a too much simple problem to solve.
b) 1.Se6? ~ 2.g8=S# 1…Bxd6! seems a better move than the key – more central move – and the interception of f6-d6 has some strategic value, also the refutation involving a specific guard on f4 is welcome.
c) 1.Rf5? ~ 2.g8=S# 1…Bb3 2.Rh5# shows an additional changed mate
d) 1.Se4? ~ 2.Qd2#, 2.g8=S# 1…Rd5!
– underlines the fact that the two thematic whites pieces are associated to the guard of h5 (2.g5+? Kh5!)
– gives a new importance to the thematic move 1…Rd5 which appears now as a refutation
– brings a transferred and changed mate 1…Bb3 2.Qd2# using the unexpected guard of d2 by the knight

Jacques Rotenberg
November 28, 2017 10:46

Another “silent feature” of this is the fact that both thematic mates close the 5th rank so that after1…Rd5 the mate is effective.

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