The Retrograde Analysis Corner

Probleemblad

May 2003

R200 - Mario Parrinello

Probleemblad, May 2003

[rn3bb1/ppR1nkpR/3p1q2/4pQ1B/P1P5/6PN/1P1P1PP1/1NB1K3]

15+12. Shortest proof game in 12.5 moves

[rn3bb1/ppR1nkpR/3p1q2/4pQ1B/P1P5/6PN/1P1P1PP1/1NB1K3]

R201 - Reto Aschwanden & Michel Caillaud

Probleemblad, May 2003

[2n2nb1/2pr2qp/p2p1k1r/1p4p1/8/8/P1PP3P/RNBQKBNR]

12+13. Shortest proof game in 19.0 moves

[2n2nb1/2pr2qp/p2p1k1r/1p4p1/8/8/P1PP3P/RNBQKBNR]

R202 - Paul Raican

Probleemblad, May 2003

[rnb1k2r/ppppp1pp/5n2/8/3P4/3B4/PPP3PP/RNB1K1NR]

13+13. Shortest proof game in 7.5 moves (transmuting kings)

[rnb1k2r/ppppp1pp/5n2/8/3P4/3B4/PPP3PP/RNB1K1NR]

R203 - Henryk Grudzinsky

Probleemblad, May 2003

[rRbBk1nr/pppppppp/8/8/4N3/b7/PqPPPPPP/3QKBNR]

15+15. Shortest proof game in 9.5 moves (Circe)

[rRbBk1nr/pppppppp/8/8/4N3/b7/PqPPPPPP/3QKBNR]

R204 - A. Frolkin, A. Kornilov, H. Juel

Probleemblad, May 2003

[2bb2Bq/1ppRRP2/1p1ppKpp/5p1Q/1P3k2/5P1P/1PP1PP2/6B1]

14+12. a) Last 3 half-moves? b) Minimum number of moves that also occurred in reverse?

[2bb2Bq/1ppRRP2/1p1ppKpp/5p1Q/1P3k2/5P1P/1PP1PP2/6B1]

R205 - Klaus Wenda

Probleemblad, May 2003

Dedicated to Dirk Borst for his 40th birthday

(This problem was later found to have duals)

[8/p1B5/3nb3/8/6pp/qr5k/5r2/4K3]

2+9. Retract 9 half-moves for #1 (Proca retractor, AntiCirce Cheylan)

[8/p1B5/3nb3/8/6pp/qr5k/5r2/4K3]