Die Schwalbe

No. 199, February 2003

11783 - Alexander Yarosh
Die Schwalbe, No. 199, February 2003
Variation of Die Schwalbe #11584

12+10. Retract 13 half-moves for a position in which it can be proven that black can no longer castle. (Proca retractor)

[5KQ1/3prp2/4pRRk/5prb/P5p1/pP6/P2PPPPP/8]

11784 - Guenther Weeth
Die Schwalbe, No. 199, February 2003
(Correction of Die Schwalbe #11652)

12+10. Retract 13 half-moves for a position in which it can be proven that black can no longer castle. (Proca retractor)

[2b5/1p1pp3/4kpp1/p7/7p/1N2P1PP/RP2PrP1/2R1BB1K]

11785 - Christoph Fieberg
Die Schwalbe, No. 199, February 2003

14+14. Proof game in 14.5 moves

[rnB1kBnr/p1p1ppqp/8/8/1P4P1/b2P3R/P1P1PP2/RNbQKb2]

11786 - Joost de Heer
Die Schwalbe, No. 199, February 2003

8+14. Proof game in 15.5 moves

[rnn1k2r/p1pp1ppp/4p3/8/7b/8/4b3/QKBNRRNB]

11787 - Reto Aschwanden
Die Schwalbe, No. 199, February 2003

13+14. Proof game in 19.0 moves

[2k5/pp4pn/7n/3ppr2/6bp/rP5q/Pb3PPP/RNBQKBNR]

11788 - Wolfgang Dittmann
Die Schwalbe, No. 199, February 2003

6+8. Retract 29 half-moves for a #1 (Proca retractor, Anticirce Cheylan)

[7q/pp3r1P/1pb5/3P4/k7/p1P2R2/P7/4K3]

11789 - Bosko Miloseski
Die Schwalbe, No. 199, February 2003

16+16. Proof game in 14.0 moves (Circe)

[rn1qkbnr/1ppppppp/bp6/1B6/8/8/PPPPPPPP/RNBQK1NR]

11790 - Wladimir Chutornoj
Die Schwalbe, No. 199, February 2003

4+3. h# in exactly 4 half-moves; how many solutions? (Vertical cylinder, free castling)

"free castling" on a vertical cylinder: Move the king two squares on the 8th
rank, and then hop with the rook over the king in either way, if possible. I.e.
there are four possible castlings in the diagram position; the position after
those castlings are Kc8/Rb8, Kc8/Rd8, Kg8/Rf8, Kg8/Rh8.

[r3k3/7R/4P3/4B3/8/8/8/5bK1]

11791 - Alexander Jarosch
Die Schwalbe, No. 199, February 2003

/This problem was later found to be cooked. See 11791v)

10+10. Last 9 half moves?

[K4rk1/2pp1ppp/1Ppp4/2R5/2PP1Q2/3p4/P1R1P1P1/8]

11792 - Alexander Jarosch
Die Schwalbe, No. 199, February 2003

(This problem was later found to be cooked. See 11792v)

6+12. Add both kings in such a way that one side can mate in 1.

[8/2p5/1P6/bPr3p1/pPp1p3/r2p3p/P7/2nRN2n]

11793 - Klase Kiesow
Die Schwalbe, No. 199, February 2003

16+15. Proof game in 3.5 moves

[rn1qkbnr/ppp1pppp/3p4/8/4P3/8/PPPP1PPP/RNBQKBNR]

11794 - Klaus Kiesow
Die Schwalbe, No. 199, February 2003

15+16. Proof game in 4.0 moves

[rnbqkbnr/ppp2ppp/3pp3/8/8/1PP5/P2PPPPP/RNB1KBNR]

11795 - Alessandro Cuppini
Die Schwalbe, No. 199, February 2003

3+7. #4 (Maximummer since black's last move)

[r3k3/6pp/4K2P/4p1b1/8/p3P3/8/8]

In 11784, a possible tactic could for instance be to reach a position in which
white retracts castling, leading to a position where castlings are mutually
exclusive.

11785-11787 and 11793-11795 are C+. 11790 has more than 170 solutions.