Re: [computer-go] False Eyes

[Christoph Vielhauer <c_vielhauer@xxxxxxxxx>]

Hi Mark,

 

actually I was trying to find a rule, which does not refer to the control of the "diagonals" on the board. Instead, I intended to use the relation of clusters to regions only (without further reference to the position on the board).

 

If I understand the "four headed dragon" correctly, there are 4 clusters (say 1 -4, clockwise starting at the top) and 4 regions (say a-d, clockwise starting at the top-left).

 

The region a (for example) has two clusters (1 and 4) and therefore might be a false eye. But 1 and 4 are also linked  via 1 - b - 2 - c - 3 - d - 4 and this link does not use region a. Thus, a is a real eye and so are the other regions.

 

So I'd say, that my definiton does work in the case of the four-headed dragon (but  indirect (recursive) links between clusters are necessary). Am I missing something?

 

Best regards

Christoph

Mark Boon <tesujisoftware@xxxxxxxxxxxxxxxxx> wrote:

>
> But since 'two-headed dragons' are extremely rare it's much more
> practical to say a point is a false eye when you (can) control at
> least 3 diagonals when in the center, and all diagonals when on the
> 1st line.
>

Moreover, your definition is incorrect in case of a four-headed
dragon. In case you wonder what it is: occupy all points on the 1st
line, except the corners.
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