No.303, 303.1
Julia Vysotska (Latvia)


Original Problems, Julia’s Fairies – 2013 (I): January – April

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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)


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
h#2              b) pe3?b3          (3+7+2)
Neutral Sirens: a4, g7
Solutions: (click to show/hide)
No.303.1 Julia Vysotska
Dedicated to Nikola Predrag!
h#2            2 solutions          (3+4+2)
Neutral Sirens: b2, e8
Solutions: (click to show/hide)

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7 years ago

Nice effects in well matched solutions !

Nikola Predrag
Nikola Predrag
7 years ago

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
Nikola Predrag
7 years ago
Reply to  Julia

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.

Diyan Kostadinov
Diyan Kostadinov
7 years ago

Julia, in both tries the first white moves are not checks, because the bQ blocks the arrival squares of the nSi, so you can remove the “+”.