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Die Schwalbe

No. 222, December 2006

13232 - Dmitri Baibikov
Die Schwalbe 222, December 2006

[n1N1k2K/8/8/8/8/8/8/8]

2+2. Add 2 wRR, wB, wS and 8 bP for an illegal cluster

[n1N1k2K/8/8/8/8/8/8/8]


13233 - Emiliano F. Ruth
Die Schwalbe 222, December 2006

(Correction of 13078)

[1rb5/4B3/2k4p/4R2p/2K4p/1p5p/1P5p/4R3]

5+9. Retract 3 moves, then mate in 1 move (Proca retractor, AntiCirce)

[1rb5/4B3/2k4p/4R2p/2K4p/1p5p/1P5p/4R3]


13234 - Günther Weeth
Die Schwalbe 222, December 2006

[2n2n2/4p3/1pp5/8/7k/8/8/4K3]

1+6. Retract 6 moves, then mate in 1 move (Proca retractor, Anticirce)

[2n2n2/4p3/1pp5/8/7k/8/8/4K3]


13235 - Wolfgang Dittmann
Die Schwalbe 222, December 2006

(Correction of 13079)

[1k1n4/1Pb2P2/1P1p1N1p/B6b/5P1P/4P1Kn/p3PP1r/5B2]

12+9. Retract 15 moves, then mate in 1 move (Proca retractor, Anticirce)

[1k1n4/1Pb2P2/1P1p1N1p/B6b/5P1P/4P1Kn/p3PP1r/5B2]


13236 - Michael Grushko
Die Schwalbe 222, December 2006

[8/8/8/4B3/4K3/7k/8/8]

1+1+1. White and black retract 1 move for h=1. Neutral bishop e5 (Circe Parrain, Checkless chess)

[8/8/8/4B3/4K3/7k/8/8]


13237 - Gerald Irsigler
Die Schwalbe 222, December 2006

How many squares can you mark at most on a chess board so that every possible position with pieces on those squares (including wK and bK) is legal?

(e.g.: mark e1 g2 h1 isn't valid, since wKe1, wBh1 wKg2 isn't legal. e1 g3 h1 is valid though)