Fairy chess composition

# No.303,303.1 (JV)

 No.303, 303.1Julia Vysotska (Latvia) Original Problems, Julia’s Fairies – 2013 (I): January – April ?Previous ; ?Next ; ?List 2013(I) Please send your original fairy problems to: julia@juliasfairies.com

No.303 by Julia Vysotska – A play of two neutral Sirens, annihilation captures and critical moves! (JV)

No.303.1 by Julia Vysotska – An improvement to No.303, with a gratitude to Nikola Predrag for his advise in the comments and for letting me construct this version myself! (JV)

Definition:

Siren (SI): A piece that plays as a Queen but captures only as a Locust

Locust (L): moves on Q-lines but only by capturing an enemy unit, arriving on the square immediately beyond that unit, which must be vacant.

 No.303 Julia Vysotska Latvia original-21.04.2013     h#2              b) pe3?b3          (3+7+2)Neutral Sirens: a4, g7     Solutions: (click to show/hide)   a) 1.nSIa4-e8 nSIg7-g2 + 2.Qb6-c6 nSIe8*c6-b5 # Logical try: 1.Qc6!? nSIg2? but nSIe8 not possible because the line of nSIa4 is closed b) 1.nSIg7-c3 nSIa4-d7 + 2.Qb6-d4 nSIc3*d4-e5 # Logical try: 1.Qd4!? nSId7? but nSIc3 not possible because the line of nSIg7 is closed   Mates through annihilation-captures on c6/d4; critical moves of the both Sirens; sacrifices of the black Queen; thematic tries with line-closings for Sirens. (Author) No.303.1 Julia Vysotska Latvia original-30.04.2013 Dedicated to Nikola Predrag!   h#2            2 solutions          (3+4+2)Neutral Sirens: b2, e8     Solutions: (click to show/hide)   I. 1.nSIb2-f6 nSIe8-b5 + 2.Sc4-e5 nSIf6xe5-d4 # Logical try: 1.Se5!? nSIb5? but nSIf6 not possible because the line of nSIb2 is closed II. 1.nSIe8-a4 nSIb2-g2 + 2.Re6-c6 nSIa4xc6-d7 # Logical try: 1.Rc6!? nSIg2? but nSIa4 not possible because the line of nSIe8 is closed   Mates through annihilation-captures on e5/c6; critical moves of the both Sirens; change of functions for the black S/R: active sacrifice and passive self-blocks; thematic tries with line-closings for Sirens. (Author)

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seetharaman
April 22, 2013 15:09

Nice effects in well matched solutions !

Nikola Predrag
April 22, 2013 17:34

The idea is more interesting than it might look at the first sight.
Having no earlier experience with Sirenes, I could be wrong, but my impression is that the mobility of Sirenes is not easy to control. In some aspects a pair of neutral Sirenes seems more powerfull than a pair of neutral Queens. Certainly concerning the possibilities of double-check by ecto-batteries.

Utilizing the intended ecto-battery but avoiding those unwanted, with the additional luxury of (anti?)critical move, this beautifully highlights the power, as well as some disabilities of Neutral Sirenes.
Wonderful concept, Julia!

Still, personally I would prefere 2 solutions (3+4+2) with reciprocal functions of black pieces (passive selfblock and active thematic sacrifice) 🙂

Nikola Predrag
April 23, 2013 01:06

Yes, it’s actually your scheme but the direction of critical moves is opposite so the last moves are 2…nSIxe5-d4# and 2…nSIc6xd7#. Instead of wPe3/f4 there is wB. There are two black selfblocks. c5 must be guarded by White only in one solution and there’s a black cookstopper on e7, so there still might be some improvement. There are 3 solutions, one is pseudo-thematic but as such it may fit in the whole logic. Anyway, that 3rd solution could be eliminated by adequate putting wK on the board.