[Retros] Benko (and Nunn) proof games on chessbase.com

[Noam Elkies]

Today's chessbase.com news brings three belated "Christmas puzzles" by
Pal Benko <http://chessbase.com/newsdetail.asp?newsid=6943>, of which
two are homebase/deletion/erasure proof games in 4.5 that I don't
recall seeing before (though inevitably the ingredients are familiar):
-Ng1 -Pe2 / -Nb8;  -Ng1 -Pd2 -Pe3 / -Ng8.  These are surely short enough
to have been found by Labelle's computer searches, but were they noticed
before that?

Two of Nunn's holiday puzzles are also proof games:

  http://www.chessbase.com/puzzle/christmas2010/chr10-03.htm
  http://www.chessbase.com/puzzle/christmas2010/chr10-08.htm

(and the other six are nice too).

Enjoy,
--NDE