No. 227, October 2007

13513 -

Die Schwalbe 227, October 2007

14+10. Add 4 pieces, including pieces on g6 and h8, of which one is white. Then Release the position!

[5k2/pppppp2/7P/1P4pK/6PB/5PRn/2P1PRQN/5BNn]

13514 -

Die Schwalbe 227, October 2007

13+12. Last 26 moves? (Duplex)

[7B/1p4p1/3p4/8/3PpPP1/PPkrbRP1/B1pnPppb/1QK4N]

13515 -

Die Schwalbe 227, October 2007

2+4. Retract 3 moves; then mate in one (Proca Retractor, Anti-Circe, Magic square b7)

[8/8/1p6/6r1/8/8/4p3/4KBk1]

13516 -

Die Schwalbe 227, October 2007

2+8. Retract 4 moves; then mate in one (Proca Retractor, Anti-Circe, Magic square b7)

[8/8/1p2p1n1/8/8/3p4/3rp3/4KBkb]

13517 -

Die Schwalbe 227, October 2007

5+12. Retract 5 moves; then mate in one (Proca Retractor, Anti-Circe Cheylan)

[8/K1bp4/b2p2p1/P5p1/3Pr1pk/6p1/5Pr1/3n2N1]

13518 -

Die Schwalbe 227, October 2007

15+11. Proof Game in 13.5 moves (Coucou Circe)

[rnbqkbnr/p1B2p2/P7/1p6/5N2/2P1P3/PPP1K1PP/R4BNR]

13519 -

Die Schwalbe 227, October 2007

23+6. Proof Game in 14.0 moves (Andernach, Circe Parrain)

[r3kbnr/8/NPPPPPPP/K7/4P3/3p4/PPPP1PPP/RNB2BNR]

13520 -

Die Schwalbe 227, October 2007

23+7. Proof Game in 14.0 moves (Andernach, Circe Parrain, Relay Chess)

[r1bqkb1r/8/PPPPPPPP/K7/8/4P3/PPPNnPPP/RNB2BNR]

13521 -

Die Schwalbe 227, October 2007

16+0. Proof Game in 21.5 moves (Losing Chess)

[8/8/8/8/6Q1/4P3/PPPP1PPP/RNB1KBNR]

13522 -

Die Schwalbe 227, October 2007

14+12.

a) Proof Game
in 8.0, h#1.5 (0.2;1.1)

b) Proof Game in exactly 8.5,
h#1.5 (0.2;1.1)

[1nq2b1r/p1p1p2p/5pp1/6kn/4P3/8/PPPP1PPP/RNB1K1NR]

13523 -

Die Schwalbe 227, October 2007

12+14. Proof Game in 8.0 moves

[rnbqkb1Q/ppppp2p/8/5p2/8/n7/PPP1P1PP/2KR1BNR]

13524 -

Die Schwalbe 227, October 2007

7+3. Equal last move?

[8/8/8/5P2/5KPn/7p/6PN/5BBk]

13525 -

Die Schwalbe 227, October 2007

Construct, using wK, wQ, wP, bK, a position in which white had as many last moves as possible.

13526 -

Die Schwalbe 227, October 2007

How many proofgames exist in which the white king, on h2, is mated by a black queen in the fastest possible way?

13527 -

Die Schwalbe 227, October 2007

The centers of the squares on which the two kings and two other white pieces are standing form (1) a rectangle (2) a square of (a) minimal (b) maximal area. In each of these four positions, a #1 is possible. Which (most economical) pieces are needed in each case?