[Retros] 8th row mates by knight promotion
andrew at anselan.com
Thu Dec 28 00:33:56 EST 2006
Thanks for your email, and charitable puzzle. I decided to tackle 2 of
Both are PG in 6.5.
I think you are right that it is better to tackle a smaller group of
problems in a focused way, rather than charging after hundreds of
I share Francois Labelle's reluctance to leap into producing a PG for
each possible last move. Apart from the sheer scale, the exercise is
also contingent upon the syntax chosen for move recording. I prefer
ideas which are inherent in the chess itself. This is probably
hair-splitting but that's aesthetics for you.
--- Olli Heimo <olli.heimo at luukku.com> wrote:
> I spent some time during Chrismas on Hirakaz's list of
> eighth row mates. I started with knight mates. From 22
> groups there 8 had 6.0 moves or less, so they are optimal
> according to computer analysis. From remaining 14 groups
> I was able to improve 11! Rather than giving my positions
> immediately, I give a puzzle.
> The groups that I improved are:
> b (earlier record 8.0), c (8.0), g (8.5), bxa (7.0),
> axb (8.0), cxb (7.0), dxc (8.0), dxe (9.0), fxe (9.0),
> fxg (8.0) and hxg (8.5).
> I dont give my new number of moves. You are welcome to try
> yourself. Composing is much easier when it is is
> guaranteed that that the old record can be broken. If
> there is something left in 48 hours from now then I will
> publish the remaining. Olli.
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