JV problem No.30
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No.30 – finished 20-Feb-2012 – A complicated one.. had taken about 2 weeks. Using just learned uncommon pieces here: MAO, MOA, Locust.
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The Problemist – 2012, Vol.23 No.11 (Sep-2012), F2990
Moa d6; Mao e4
Set-play: 1.Qf4 nMO×e4+ 2.Kf5 nMOg3‡
1…Ka4 2.Qe7 nMA×d6+ 3.Kf6 nMAe8‡
- Block of the neutral Locust by the white King; Zilahi theme;
- Reciprocal transformation of neutral batteries: Initial battery MOA/LO to MAO/LO and initial battery MAO/LO to MOA/LO after reciprocal captures of their forward-pieces.
- Bi-valve realized by the black Q: line opening for the neutral Mao/Moa, line closing for the neutral Moa/Mao on the mating move. Distant self-block by the black Q.
- Pins of black Q by the neutral Mao/Moa.