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Probleemblad

Jan-Mar 2010

R364c - René J. Millour

Probleemblad Jan-Mar 2010

[1nbkqbnr/ppppp3/R1r5/8/4Q3/8/1PPPP1B1/1NB3N1] [8/8/5p2/5p2/P5KP/5PP1/8/8]

[1nbkqbnr/ppppp3/R1r5/8/4Q3/8/1PPPP1B1/1NB3N1]

[8/8/5p2/5p2/P5KP/5PP1/8/8]

10+13. Shortest proof game in 19.0 moves (Alice chess)

Solution

1. a4(B) h5(B) 2. Ra6(B) h4(A) 3. Rf6(A) h3(B) 4. h4(B) Rh6(B) 5. Rh8(B) Sa6(B) 6. Rb8(A) h2(A) 7. Rc8(B) h1=B(B) 8. Rcc6(A) Bd5(A) 9. f3(B) Qb8(B) 10. Kf2(B) OOO(B) 11. Qe1(B) Rdh8(A) 12. Qe4(A) Kd8(A) 13. Rcd6(B) Be6(B) 14. Kg3(A) Bc8(A) 15. Kg4(B) Qe8(A) 16. g3(B) Sb8(A) 17. Rda6(A) Rc6(A) 18. Bh3(B) gf6(B) 19. Bg2(A) f5(B)

Bc8 is the promoted h-pawn, black queen and king switch places, Rh8 is originally from a8, Sb8 makes a switchback.


R367 - Unto Heinonen

Probleemblad Jan-Mar 2010

[rnbq2nr/p1ppp2p/5k2/5p2/1PP5/1RpKbP1B/PB2NP2/QN1R4]

13+15. Shortest proof game in 21.5 moves

[rnbq2nr/p1ppp2p/5k2/5p2/1PP5/1RpKbP1B/PB2NP2/QN1R4]

Solution

1. c4 b5 2. Nc3 b4 3. Rb1 bxc3 4. b4 Nf6 5. Rb3 Ne4 6. Bb2 Nxd2 7. Qa1 Nf3+ 8. exf3 g5 9. Ke2 g4 10. Kd3 g3 11. Ne2 gxh2 12. g4 Bh6 13. Bh3 Be3 14. Rd1 h1=N 15. g5 Ng3 16. g6 Nf5 17. g7 Nh6 18. g8=N f5 19. Nf6+ Kf7 20. Ne4 Ng8 21. Nd2 Kf6 22. Nb1

Black and white have a Phoenix-Pronkin knight


R368 - Nikolai Beluhov

Probleemblad Jan-Mar 2010

[1b6/2pp1p2/N1pRp3/1pK5/PN6/qPkP3p/nBbRPPpP/Qr1B4]

14+14. Last 32 single moves?

[1b6/2pp1p2/N1pRp3/1pK5/PN6/qPkP3p/nBbRPPpP/Qr1B4]

Solution

White captures are Bc1xb2 and gxh, black captures are axb and b7xc6. To unblock the position, one of the kings needs to get space. Because b7xc6 can't be retracted until Bc8 is back, the black king needs to be freed first.

1. Bc1xRb2 g3-g2 2. Rd5-d6 g4-g3 3. Rh5-d5 g5-g4 4. Rh8-h5 g6-g5 5. h7-h8=R g7-g6 6. g6xSh7 Sf6-h7 7. g5-g6 Sd5-f6 8. g4-g5 Sb6-d5 9. g3-g4 Ba7-b8 10. Sb8-a6 h4-h3 11. Sa6-b4 Sb4-a2 12. Qa2-a1 Ra1-b1 13. Qb1-a2 Ra2-a1 14. Qa1-b1 Bb1-c2 15. Bc2-d1 h5-h4 16. Rd1-d2 h6-h5 and further e.g. 17. Rh1-d1 h7-h6 18. Bg5-c1 Kd2-c3 etc.