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Probleemblad

Nov-Dec 2006

R317 - Unto Heinonen
Probleemblad, Nov-Dec 2006

1. c4 e5 2. Nc3 Ba3 3. b4 d5 4. Bb2 Bf5 5. Rc1 Bb1 6. e4 Ne7 7. Ke2 Nc8 8. Kf3 Ke7 9. Kg4 Re8 10. Nf3 h5+ 11. Kxh5 g5 12. Kxg5 f5 13. Kxf5 c5 14. Kxe5 Qc7+ 15. Kxd5 Qg3 16. Kxc5 b5 17. Kxb5 a5 18. c5 Na6 19. Kxa5

The white king captures all black pawns on the 5th row.


R318 - Marco Bonavoglia & René J. Millour
Probleemblad, Nov-Dec 2006

The white king reached g1 via castling, the black king escaped via
castling, the last move was b2-b4, Ra2 is a promoted piece, the white
pawn on a4 captured twice (c2xb3xa4 or a2xb3xa4).

So the sequence of moves is:

1. Pe2-e4*Bf5*Pg6(ep)*Ph7*Ng8=R (with Bf8 shielding the black king).

2. Bf8-g3; h2*Bg3 (f8 is the promoted black a-pawn).

3. Black OO, Qd8-h2*Ng1, white OO, Rf1-b3 (the black queen is the only
black piece that can capture Ng1, through h2).

4. Pb7-b5*Qa4*Rb3; a2*Pb3; white promotion rook to a2; b3*Ra4.

5. Pd2*Qc3*Rb4; then Bc1*Nb8 (only Bc1 can capture Nb8);
Pa5*Pb4*Pc3(ep)*Bd2*Rc1/e1=B-f8. Pd2xc3 is needed to release the white
bishop, c3xb4 is needed for the ep capture on c3.

6. The black king captured Nb1: The black b-pawn can't reach b1, Bc8 is
captured early in the game by Pe4, before a2 or c2 could move.

So the answers are:

a) The first move is e2-e4, because a2, d2 and h2 must capture, c2 is
captured en passant and b2-b4 is the last move.

b) Bf8 is a promoted piece, so there is no switchback on f8! The four
necessary switchbacks are:

- Rh8-f8(castling)-h8(to let out the black queen).
- Qh2xNg1-h2.
- Ba7xNb8-a7.
- Kc2xNb1-c2 (the black king can't go through a2)

c) The white captures are: Pe4*Bf5, Pf5*Pg6(ep), Pg6*Ph7, Ph7*Ng8,
Ph2*Bg3, Pa2*Pb3, Pb3*Ra4, Pd2*Qc3, Pc3*Pb4, Ba7*Nb8.


R319 - Paul Raican
Probleemblad, Nov-Dec 2006

-1. Ke1xPd2[Ke1] d3-d2 -2. Ke2xPd2[Ke1] d4-d3 -3. Ke1-e2 d3-d2 -4. Ke3xNf2[Ke1] d5-d4 -5. Ke4-e3 d7(6)-d5 -6. Bf7-g8 Nd1(h1)-f2 -7. Be8-f7 and 1. Kf4#