[Retros] 8th row mates by knight promotion

andrew buchanan andrew at anselan.com
Thu Dec 28 00:33:56 EST 2006

Hi Olli,

Thanks for your email, and charitable puzzle. I decided to tackle 2 of
your set:



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
different records.

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:

> Hello!

> 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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