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Die Schwalbe

No. 220, August 2006

13127 - Gerald Irsigler
Die Schwalbe, No. 220, August 2006

[4k3/3p1p1N/3P1P1p/B2PpKpP/PNB1Pp2/8/2P4P/8]

13+7. Mate in how many moves?

[4k3/3p1p1N/3P1P1p/B2PpKpP/PNB1Pp2/8/2P4P/8]


13128 - Alexander Yarosh
Die Schwalbe, No. 220, August 2006

[3bb3/2pprPpn/4pBp1/4p1K1/8/3P1P1k/4PpRr/5BRq]

9+14. Add a black pawn and release the position!

[3bb3/2pprPpn/4pBp1/4p1K1/8/3P1P1k/4PpRr/5BRq]


13129 - Alexander Yarosh
Die Schwalbe, No. 220, August 2006

[7n/1p1Kpp2/p5p1/pB2B3/1PPp1P2/Q3PRP1/3Prqp1/2N1bkr1]

12+14. Add a white rook and a piece on h1, then h#1

[7n/1p1Kpp2/p5p1/pB2B3/1PPp1P2/Q3PRP1/3Prqp1/2N1bkr1]


13130 - Michel Caillaud
Dedicated to Werner Keym
Die Schwalbe, No. 220, August 2006

[2N4b/3R4/B7/3P4/1PP1P3/Br1KRP1P/Pq1nQrP1/1Nk2b2]

16+7. Release the position!

[2N4b/3R4/B7/3P4/1PP1P3/Br1KRP1P/Pq1nQrP1/1Nk2b2]


13131 - Andrey Frolkin
Dedicated to Werner Keym
Die Schwalbe, No. 220, August 2006

[NBRqrbBN/1ppppp2/1p4Pk/8/7K/6P1/1RP5/1RB5]

12+10. Did promotions, castling or en passant captures occur? (3 wR, 3wB)

[German: »Gab es Umwandlungen, Rochaden oder e.p.-Schläge?«. Mathematically that implies you have to prove only one of the three questions, but intended is of course to show the minimal number of promotions, en passant captures and castlings. -- Joost de Heer]

[NBRqrbBN/1ppppp2/1p4Pk/8/7K/6P1/1RP5/1RB5]


13132 - Roberto Osorio & Jorge Lois
Dedicated to Mario Richter
Die Schwalbe, No. 220, August 2006

[1Nrqkb1r/pppp1pPn/4Pp2/8/8/3P1K2/1Pp1P1P1/8]

8+13. Retract 33 half-moves for #1 (Proca rectractor)

[Is »#1 17 moves ago« a clear enough translation of the German original »#1 vor 17 Zügen?«, or is the proper English form the one I used above? -- Joost de Heer]

[1Nrqkb1r/pppp1pPn/4Pp2/8/8/3P1K2/1Pp1P1P1/8]


13133 - Andrey Frolkin & Kostas Prentos
Die Schwalbe, No. 220, August 2006

[rnq2rk1/ppp1p3/4b2p/7p/1N2P3/1KpP4/P2Q1PPP/3R2NR]

12+13. Shortest proof game in 13.0 moves. Which intermediate positions are cooked?

[rnq2rk1/ppp1p3/4b2p/7p/1N2P3/1KpP4/P2Q1PPP/3R2NR]


13134 - Werner Keym
Die Schwalbe, No. 220, August 2006

Construct a position with both kings (on different colored squares),
one officer and one pawn, in which you can prove that a piece hasn't been on

(a) exactly 4 white squares
(b) exactly 5 white squares
(c) exactly 6 white squares
(d) exactly 7 white squares

(Example: with a pawn on g2, you can prove that a white bishop hasn't
been on h1 and g2)