September 2002
R178 - Andrew Buchanan
Probleemblad 5/2002
10+16. The four proof games of shortest length
(Find four distinct proof games leading to the diagram, in such a way that any other proof game is longer than the longest of the four proof games.)
[r1bqk1nr/pp1ppp1p/5p1b/8/2n2P1P/8/1PPPP3/2BQKB1r]
Solution
12+12. Shortest proof game in 18.5 moves
[B6B/2pppp2/5nnk/p6p/8/5R1N/N1PPPP1q/R1bQKb2]
R180 - Michel Caillaud
15+15. Shortest proof game a) Orthodox b) Circe
[rnb1kbr1/pppp1pp1/3p3n/7p/P4P2/6PR/1PPPP1P1/1NBQKBN1]
R181 - Andrej Frolkin & Andrej Kornilov
(This problem was later found to be cooked)
13+12. Last 2 non-identical checks?
[2bb2B1/PprRRP1q/2pppKpp/5p2/5k2/P4P1P/2P1PP2/6B1]
R182 - Klaus Wenda & Wolfgang Dittmann
4+5. Retract 4 moves for a s#1 (Proca-retractor, Anti-Circe Type Cheylan)
Note: 7 half-moves are retracted (4 white and 3 black)
[8/8/8/8/3p3p/3p4/1Q6/kr1RK1N1]