Mar-Apr 2004 - SOLUTIONS

R224c - Wolfgang Dittmann

Probleemblad, Mar-Apr 2004

Unsolvable: Pb2 has captured to give the bishop access to a1. This means that white captured at least 5 times. The intended solution started with retracting g4xPh5, which is illegal due to too many captures.

R234 - Wolfgang Dittmann

Probleemblad, Mar-Apr 2004

Retract -1. Ke2xRd1! Ke7-f6 -2. Ke1-e2 Rd2(4)-d1/Rd3-d1 -3. Ka3xQa4!/Ka3xQb3! Kd8-e7 -4. Rb7-b5 & 1. Rd7#.

DUALS (found by Dolf Wissmann): -2. .. Rd3(4)-d1 -3. Kd1xQd2! and -2. .. Rd2-d1 -3. Kd4xQd3!/Kf2xQe2.

R235 - Henrik Juel

Probleemblad, Mar-Apr 2004

Retract -1. Kd4-d3 (+bSd3)Se5-d3 -2. (+Qd3)a4xXb5 and 1. Qb5#. Not 2. Kc5-d4?? (+Q/R/Bd4)!

Try: -1. Kc3-d3?? (+bPd3)e4xd3ep!

R236 - Tom Volet

Probleemblad, Mar-Apr 2004

None of the black pawns can soon retract a move: Because of Bg8, the black pawn on g6 comes from g7, and black can't retract g6-g7 until the white king has left the black camp; h6xg5 can't be retracted because the white king can't escape via f6; d7xe6 can't be retracted until Bg8 is back on c8; and e7-e6 implies that the white king entered the black camp via h6-g7, which leads to the conclusion that the black bishop was captured on f8, and both a-pawns promoted without a capture, a contradiction; and a similar reasoning forbids d6xe5. The black king can't be released with a capture on d2, resulting once again in a clash on the a-file. So the black king must be released by retracting a2xb3xc4. On c4, a queen or a rook was uncaptured. To unpromote this piece on a1, a black bishop must be uncaptured on g3 so it can shield on a6. This means that the uncaptured piece on c4 was a rook, which had to shield on b6. After unpromoting the rook on a1, white can retract a2xQ/Rb3 and the position is released.

Reciprocal retro-screens (R screening B and B screening R) with both units uncaptured and one unpromoted in the retroplay.

R237 - Mario Parrinello

Probleemblad, Mar-Apr 2004

1. g4 b5 2. g5 b4 3. g6 b3 4. gxh7 bxc2 5. hxg8=B Rh5 6. b4 Ra5 7. b5 e5 8. b6 Ba3 9. b7 Ke7 10. bxc8=B Qxg8 11. Bxa3+ Kd8 12. Be7+ Kxc8

Two Schnoebelen bishops.

R238 - Unto Heinonen

Probleemblad, Mar-Apr 2004

1. h4 d5 2. h5 d4 3. h6 d3 4. hxg7 dxe2 5. gxh8=R exf1=N 6. Ne2 b5 7. Ng3 b4 8. Ke2 b3 9. Qxf1 bxa2 10. b3 axb1=B 11. Ra4 Nc6 12. Rah4 Nd4+ 13. Kd3 f6 14. Kc3 Kf7 15. Kb2 Kg7 16. Kxb1 Kxh8

Schnoebelen-"AUW" (in orthodox, a Schnoebelen Q is impossible, so RSB are all possible Schnoebelen promotions)

R239 - Paul Raican

Probleemblad, Mar-Apr 2004

1. Nf3 Nc6 2. Nd4 Ne5 3. Nc6 bxc6 4. a4 Ba6 5. Ra3 Qb8 6. Rd3 Qb6 7. c3 Qe3 8. fxe3 f6 9. Kf2 f5 10. Kg3 f4+ 11. Kh4 f3 12. g3 f2 13. Bh3 f1=Q 14. Qb3 Qxc1 15. Qd5 Qc2 16. Rc1 Qb3 17. Qh1 Qb8 18. Qd1 Qd8 Pronkin queen and queen circuit.

R240 - Jorge Lois, Roberto Osorio

Probleemblad, Mar-Apr 2004

1. c4 f5 2. c5 f4 3. c6 bxc6 4. d4 Ba6 5. d5 Bxe2 6. d6 Bc4 7. Qh5+ Bf7 8. Be2 Na6 9. Bd1 Rb8 10. Ne2 Rb3 11. Rg1 Rh3 12. gxh3 Nb8 13. Rg6 Bxa2 14. Bd2 Bxb1 15. Rf6+ Bg6 16. Rf7 Bd3 17. Bc3 Ba6 18. Kd2 Bc8

Long bishop circuit for shielding twice on the h5-e8 diagonal.

R241 - Göran Wicklund

Probleemblad, Mar-Apr 2004

1. e4 h5 2. Qg4 hxg4 3. d4 g3 4. hxg3 Nf6 5. Rh6 Ng4 6. Rb6 axb6 7. Bf4 Ra3 8. Kd2 Rf3 9. a4 Rh6 10. a5 Rc6 11. a6 g6 12. Ra5 Bg7 13. Rg5 d5 14. a7 Be6 15. a8=R Nd7 16. Ra1 Qa8 17. Nc3 Qa2 18. Ba6 f5 19. Nge2 Bf7 20. Rh1 e6 21. Rh8+ Ke7 22. Ra8

Capturefree maximum circuit by the promoted rook.