No. 220, August 2006
13127 - Gerald Irsigler Die Schwalbe, No. 220, August 2006
13+7. Mate in how many moves?
[4k3/3p1p1N/3P1P1p/B2PpKpP/PNB1Pp2/8/2P4P/8]
13128 - Alexander Yarosh Die Schwalbe, No. 220, August 2006
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
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
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
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
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
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)