No. 224, April 2007

13334 -

Die Schwalbe 224, April 2007

8+8. Add a piece and release the position

[8/p1ppp3/4p3/4P3/3PP3/1K1P4/P1PPk3/1bn5]

13335 -

Die Schwalbe 224, April 2007

12+10. History of white Pawn h2?

[4kQb1/1ppN1ppB/3Pp1Rb/4Kpp1/8/1P2P3/P1P2PP1/8]

13336 -

Die Schwalbe 224, April 2007

Dedicated to Werner Keym's 65th birthday

15+7. #2

a) Diagram

b) -wBb2 (AP)

c) = b) & bPe7->c7 (AP)

[8/3PpP2/2Q1P3/3N2P1/5Pp1/2P1P1Pb/1B1R2pp/R2BK1kr]

Comment by Valery Liskovets on the Retro Mailing List, May 2007: "forced e.p." is differently justified and with different APs.

Comment by Valery Liskovets on the Retro Mailing List, May 2007: The triplet (c) in my problem #13336 has, unfortunately, an unintentional solution. Correction: (c)=(b) & bPe7->d6 (instead, stipulated "2 solutions" in the published version of (c) would also make sense).

13337 -

Die Schwalbe 224, April 2007

1+0. Add 2K+19S for an Illegal Cluster

[6N1/8/8/8/8/8/8/8]

13338 -

Die Schwalbe 224, April 2007

13+13. Shortest Proof Game in 6.5 moves (2 solutions)

[1nNqkbnr/2pppppp/8/8/8/8/P2PPPPP/1rBQKBNR]

13339 -

Die Schwalbe 224, April 2007

12+15. Shortest Proof Game in 19.0 moves

[rnbqkbnr/1ppRpp2/1pPp4/5Bp1/Q2B4/1KN1P3/3P1PP1/6N1]

13340 -

Die Schwalbe 224, April 2007

11+14. Shortest Proof Game in 25.5 moves

[2bqkb2/p1p5/R1n4n/8/PPPPPPPR/1pppppp1/6B1/2K5]

13341 -

Die Schwalbe 224, April 2007

12+11. Retract 11 Moves; then mate in one (Proca Retractor, Anti-Circe)

[b1r1nB2/1KpP4/kp6/NrP5/Pp3P2/1p3P1P/P2b1b1P/4Q3]

13342 -

Die Schwalbe 224, April 2007

16+16. Shortest Proof Game in 15.0 moves (Circe Parrain)

[rnb1k3/pppp1qp1/4rp1P/P4p1P/P3n2P/P3b1pP/P7/RNBQKBNR]

13343 -

Die Schwalbe 224, April 2007

In a legal position with 3 pieces, the ratio of the number of legal moves for these pieces is 1:2:3. After a white and a black move, the number of moves changes, and the new ratio is 2:1:3

Example: In the begin position, piece A has 3 moves, piece B has 6 and piece C has 9 moves. After a white and a black move, piece A now has 4 moves, piece B has 2 moves and piece C has 6 moves.