Die Schwalbe

No. 192, December 2001

11347 - Hector Guillermo Zucal & Julio Alberto Pancaldo
Die Schwalbe, Heft 192, 2001

15+14. Mate in 2 moves a) Diagram b) Na3->h3

[rnb1k2r/pppppppp/6n1/8/8/N1N5/PPPPPPPP/R1B1KB1R]

11348 - Sergio Orce
Die Schwalbe, Heft 192, 2001

9+10. Retract one white move, and then mate in 2 moves a) Diagram b) h4->h5

[4k2r/2p1p1pp/pp2P1P1/8/6Rp/P6p/5PPP/R3K3]

11349 - Andrej Kornilow & Andrej Frolkin
Die Schwalbe, Heft 192, 2001

12+14. Release the position!

[n4K2/P1pprp2/1p2pRQk/5pRb/1P4pb/1p4P1/2PPPP1P/7n]

11350 - Andrej Frolkin
Die Schwalbe, Heft 192, 2001

13+11. Proof game in 19.0 moves

[nrkbbqrn/p2p4/2p5/8/8/2P2Q2/1P1BPPPP/K2R1BNR]

11351 - Reto Aschwanden
Die Schwalbe, Heft 192, 2001

15+14. Proof game in 19.5 moves

[2q3k1/prpp2pp/brn3n1/1pb5/4P3/N1P2P2/P1PP2PP/2KRBBQR]

11352 - Gligor Denkovski & Ivan Denkovski
Die Schwalbe, Heft 192, 2001

16+13. Proof game in 21.0 moves

[r3k3/p1pbqp1p/2NQ1n2/3pn3/1bPK4/2B1rR1N/P1PPPPPP/5B1R]

11353 - Zalmen Kornin
Die Schwalbe, Heft 192, 2001

13+14. (Forced castling) Mate in 2 moves a) diagram b) -bQb1

"Forced castling": If castling is legal, it must be played.

[4k2r/Rp4pp/pP1P1P2/1p1KpP2/8/BPNQ4/rbBNP3/nqnb4]

11354 - Klaus Wenda
Die Schwalbe, Heft 192, 2001

4+4. (FrischAufCirce) Retract 1 white move, then help mate in 4 moves (white starts in the helpplay). 2+1 Grasshoppers.

[r3k3/3r2G1/8/8/B7/1G1g4/8/6K1]

11355 - Werner Keym
Die Schwalbe, Heft 192, 2001

Starting with the initial game array (white to move), there exist, for any piece and any square it can reach, there exists a proof game in which this piece ends up on that square. Moves by promoted pieces aren't allowed. Which of these games is longest, and for which piece/square is this maximum reached?

[Examples: There's a 7.5 move long proof game in which Ke1 reaches a8, and there is a 7.0 move long proof game in which Ra8 reaches f8]

According to the author, the answer is unique!

11356 - Alessandro Cuppini
Die Schwalbe, Heft 192, 2001

9+3. Mate in 2 moves a) diagram b) Ka3->c1

[kBRb4/2p1P2P/2P5/1PPP4/8/K7/8/8]

11357 - Wolfgang Betzen
Die Schwalbe, Heft 192, 2001

7+5. Mate in 3 moves

[r3kq1R/6p1/N3K1p1/2N3P1/5P2/8/8/1R6]

11358 - Wolfgang Betzen
Die Schwalbe, Heft 192, 2001

5+4. Helpmate in 2 moves

[8/8/8/8/5bq1/5Pk1/4P1bN/4K2R]

11359 - Christoph Fieberg
Die Schwalbe, Heft 192, 2001

13+10. Proof game in 8.5 moves

[2b1k1n1/1p1ppp1p/6p1/8/8/8/r1PPPPPP/1NBQKBNR]

11360 - Jens Guballa
Die Schwalbe, Heft 192, 2001

16+16. Proof game in exactly 9.5 moves

[rnbqkb1r/pppp1Qpp/4ppn1/2P1N3/8/8/PP1PPPPP/R1B1KBNR]