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Problems 634 & 635: Ivan Soroka - Selfmates
ivan.soroka(08.12.2015) Two selfmates by Ivan Soroka where the promotions are with important role in the main content.
634) 1.Ra4?
1...axb1S 2.Qf8+ Ke5 3.Qf6+ Kd5 4.Sc7+ Kc5 5.Qc3+ Sxc3#
1...axb1B 2.Rf6+ Ke5 3.Qb8+ Kd5 4.Qb7+ Ke5 5.Re4+ Bxe4#
     1.Bd8! (zz)
1…axb1S 2.Rf6+ Ke5 3.Rf4+ Kd5 4.Sc7+ Kxc5 5.Qc3+ Sxc3#
1...axb1B 2.Sd4+ Kf4 3.Raf6+ Ke5 4.Rd6+ Kf4 5.Qf6+ Bf5#
Five-mover with change continuations, black minor promotions,
creation and play of black and white batteries S+R, R+Q. (Author)
635)  1.g8Q+ Kh6 2.Qg5+ Kh7 3.Qh5+ Kg7 4.Qc3+ Kf8
5.d8R+ Ke7 6.f8Q+ Ke6 7.Qh3+ Qf5 8.Qe8+ Kf6 9.Qg5+ Qg5#.
Miniature with 3 white promotions QRQ. (Author)

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