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Die Schwalbe

No. 196, August 2002

11583 - Alexander Zolotarev
Die Schwalbe, Heft 196, August 2002

[qR6/bb1p2p1/Kpp1pP2/3P4/k1P5/bbP5/RPP3P1/QB6]

12+11. Add a black pawn and release the position (4bB)

[qR6/bb1p2p1/Kpp1pP2/3P4/k1P5/bbP5/RPP3P1/QB6]


11584 - Andrej Frolkin
Die Schwalbe, Heft 196, August 2002

[5KQ1/p2prpR1/4p1Rk/5prb/5Npn/P2P1P1B/1P1p1PP1/2b5]

12+13. Release the position!

[5KQ1/p2prpR1/4p1Rk/5prb/5Npn/P2P1P1B/1P1p1PP1/2b5]


11585 - Peter Olzewski
Die Schwalbe, Heft 196, August 2002

[r7/P1ppp2P/p5pr/4nqb1/3pPk2/3b1Pp1/3P1P2/2nRK1N1]

9+15. a) h#2 in such a way that b) has a solution
b) h#1 after the key of a)
c) Kf4->f8; h#2 in such a way that d) has a solution
d) h#1 after the key of c)

[r7/P1ppp2P/p5pr/4nqb1/3pPk2/3b1Pp1/3P1P2/2nRK1N1]


11586 - Alexander Jarosch
Die Schwalbe, Heft 196, August 2002

[4k2r/Npp2pp1/4prPb/4QR2/5P2/1P2P1P1/P3P2P/R3K3]

13+9. Retract a white move for #3

[4k2r/Npp2pp1/4prPb/4QR2/5P2/1P2P1P1/P3P2P/R3K3]


11587 - Rustam Ubaidullaev
Die Schwalbe, Heft 196, August 2002

[r4Bn1/pnpppp1Q/kq3Rpr/1p3B1p/P7/N3KR1P/2PPPP1N/b6b]

14+16. Proof game in 23.0 moves

[r4Bn1/pnpppp1Q/kq3Rpr/1p3B1p/P7/N3KR1P/2PPPP1N/b6b]


11588 - Andrej Kornilov/Andrej Frolkin
Die Schwalbe, Heft 196, August 2002

[6b1/1p1ppppp/p2ppp1b/6k1/8/5k1p/pp1nbpp1/3rbq2]

0+24. Color the pieces and add the minimal number of pieces for the shortest possible proof game.

[6b1/1p1ppppp/p2ppp1b/6k1/8/5k1p/pp1nbpp1/3rbq2]


11589 - Wolfgang Dittmann
Die Schwalbe, Heft 196, August 2002

[8/6p1/6p1/5Prb/6Rk/6p1/1P1K2P1/n2R4]

6+7. Retract 4 black and white moves for a s#1 (Proca retractor, Anticirce Cheylan)

[8/6p1/6p1/5Prb/6Rk/6p1/1P1K2P1/n2R4]


11590 - Bernd Gräfrath
Die Schwalbe, Heft 196, August 2002

[1r3k2/pppp4/6p1/8/B3P2P/8/1PPP1PP1/R4KR1]

11+7. Who can castle? Last move? (Fischerrandom)

[1r3k2/pppp4/6p1/8/B3P2P/8/1PPP1PP1/R4KR1]

Fischerrandom

The starting position of the pieces (not pawns) is chosen randomly (the black position being symmetric to the white), with two conditions: The bishops end  up on different colored squares, and the king ends up between the two rooks.

Castling follows the same rules (not while in check, no castling through guarded squares, squares between king and rook should be unoccupied).

Queenside castling is done by moving the king to c1 and the rook closest to the a-line to d1. Both squares should be empty, or occupied by the king/rook. Similarly, kingside castling finishes with a king on g1 and a rook on f1.

In the diagram position, two castlings are possibly legal: black queenside castling, and white kingside castlings.

The initial position in 11590 is:

[qrbnnkrb/pppppppp/8/8/8/8/PPPPPPPP/QRBNNKRB]

[qrbnnkrb/pppppppp/8/8/8/8/PPPPPPPP/QRBNNKRB]