May 2002

H438 -

Probleemblad, June 2002

Dedicated to Michel Caillaud

a) Black pawns captured 6 times, including Bf1, so the last move can't have been e2-e4. WPg3 came from h2, and f2-f3 must have been played before Bg1 arrived there, or it would be a promoted bishop with 8 black pawns on the board. So the last move was c2-c4. 1. bc3ep g4 2. Bf2 Bf2#

b) Now the last move could've been Bg5-h4. 1. Bf7 Bf6 2. e5 de6ep#

EP capture in both solutions.

R169 -

Probleemblad, June 2002

1. d4 Nc6 2. Kd2 Ne5 3. dxe5 Nf6 4. e6 dxe6+ 5. Ke3 Nd7 6. Qd5 Nb8 7. Qh5 Nc6

A knight moves to and from the home square of his sibling in a 'shorty'.

R170 -

Probleemblad, June 2002

1. Nf3 e5 2. Nxe5 Nc6 3. Nxc6 dxc6 4. d3 Qxd3 5. Bg5 Qf3 6. Qd7+ Kxd7 7. exf3 Bb4+ 8. Ke2

Rotational-symmetric end position after non-symmetric play.

R171 -

Probleemblad, June 2002

a) 1. e4 d5 2. exd5 Be6 3. dxe6 Qd7 4. exf7+ Kd8 5. fxg8=N Qe8 6. Nf6 exf6+ 7. Qe2 Bc5 8. Kd1 Be3 9. Qe1 c5

b) 1. e3 f6 2. Qg4 Kf7 3. Qxd7 Qe8 4. Qxc8 e6 5. Kd1 Ke7 6. Qxe6+ Kd8 7. Qxg8 Bc5 8. Qc4 Bxe3 9. Qe2 c5 10. Qe1

Completely different play in each twin.

R172 -

Probleemblad, June 2002

1. a4 b5 2. axb5 e5 3. Ra6 Ba3 4. d4 c5 5. dxc5 Qh4 6. Qd6 g5 7. Qc7 d5 8. Rd6 a5 9. c4 Ra6 10. cxd5 Qc4 11. f4 Bg4 12. Rd7 Rf6 13. fxe5 Rf2 14. h4 f5 15. hxg5 Nf6 16. Rh6 Rf8 17. Rg6 h5 18. e4 h4 19. Be3 Bh5 20. g4 Rd2 21. gxh5 Ng4 22. b4 Rf6 23. bxa5 Bb4 24. exf5

The white pawns all cross-capture on the 5th row.

R173 -

Probleemblad, June 2002

I) 1. h5[B] Rc2[A] 2. h4[A] Rh2[B] 3. h3[B] Rb2[A] 4. h2[A] Rb1[B] 5. h1=B[B] Rb8[A] 6. Bf3[A] Rc8[B] 7. Bg4[B] Rc1[A] 8. Kd8[B] Bd6[B] 9. Kc8[A] Bb8[A] 10. Kb8[B] Nb6[B] 11. Ka7[A] Na8[A] 12. Ka8[B] Be6[B] 13. Kb8[A] Bc8[A] 14. Kc8[B] Kf1[A] 15. Kd8[A] Rd1[B] 16. Bc8[A] Rd3[A]

II) 1. h6[B] Ra1[A] 2. h5[A] Rb1[B] 3. hg4[B] Rb2[A] 4. g3[A] Rh2[B] 5. g2[B] Rh8[A] 6. g1=B[A] Rf8[B] 7. Bc5[B] Rf1[A] 8. Kf8[B] Bb2[B] 9. Kg8[A] Bh8[A] 10. Kh8[B] Ba2[B] 11. Kh7[A] Bg8[A] 12. Kg8[B] Nd6[B] 13. Kf8[A] Ne8[A] 14. Ke8[B] Rd1[B] 15. Bf8[A] Rd3[A] 16. Kd8[A] Kf1[A]

The black king must triangulate, so in either solution a bishop is captured and replaced by the promoted black pawn.

R174 -

Probleemblad, June 2002

Add wKd3, wQh5, bKb5, bBa6, bPb7. After retracting Q~-h5, black needs to uncapture something on b5, but there is nothing he can capture. Without e2, the last move was Qd1-h5 and black can uncapture the queen, without h2 the last move was Qh1-h5 and black can uncapture a rook.