September 2002

R178 -

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]

R179- Rustam Ubaidullaev

Probleemblad 5/2002

12+12. Shortest proof game in 18.5 moves

[B6B/2pppp2/5nnk/p6p/8/5R1N/N1PPPP1q/R1bQKb2]

R180 -

Probleemblad 5/2002

15+15. Shortest proof game a) Orthodox b) Circe

[rnb1kbr1/pppp1pp1/3p3n/7p/P4P2/6PR/1PPPP1P1/1NBQKBN1]

R181 -

Probleemblad 5/2002

(This problem was later found to be cooked)

13+12. Last 2 non-identical checks?

[2bb2B1/PprRRP1q/2pppKpp/5p2/5k2/P4P1P/2P1PP2/6B1]

R182 -

Probleemblad 5/2002

(This problem was later found to be cooked)

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]