No.303,303.1 (JV)

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)

9 Responses to No.303,303.1 (JV)

  1. seetharaman says:

    Nice effects in well matched solutions !

  2. Nikola Predrag says:

    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) 🙂

    • JuliaJulia says:

      Thanks you, Nikola! But does it mean you have that 3+4+2 version? 🙂

      • Nikola Predrag says:

        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.

        • JuliaJulia says:

          Thank you, Nikola, for letting me to construct it myself!
          I believe, this is the one you’ve written about:
          h#2; Siren e8, b2; (3+4+2)
          I. 1.nSIb2-f6 nSIe8-b5 + 2.Sc4-e5 nSIf6*e5-d4 #
          II. 1.nSIe8-a4 nSIb2-g2 + 2.Re6-c6 nSIa4*c6-d7 #

          Let me think about it….. thanks!

  3. Diyan Kostadinov says:

    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 “+”.

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