[Retros] Probleemblad 5-2002

Joost de Heer ildjarn666 at linuxmail.org
Fri Oct 4 16:00:32 EDT 2002

> R178 - Andrew Buchanan

> r1bqk1sr/pp1ppp1p/5p1b/8/2s2P1P/8/1PPPP3/2BQKB1r

> The four proof games of shortest length

Perhaps a little explanation is necessary: There is a proofgame in x, in x+a, in x+b and in x+c halfmoves, where a,b,c distinct, 0<a<b<c, x and c minimal. (i.e. there is no d <> a,b,c, 0<d<c for which a proofgame exists)

> R182 - Klaus Wenda & Wolfgang Dittmann

> 8/8/8/8/3p3p/3p4/1Q6/kr1RK1S1

> Retract 4 moves for a s#1

> Proca-retractor, Anti-Circe Type Cheylan

And here 7 halfmoves are retracted (4 white and 3 black).

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