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Re: computer-go: Ko

To: computer-go@xxxxxxxxxxxxxxxxx
Subject: Re: computer-go: Ko
From: Gunnar Farnebäck <gunnar@xxxxxxxxxxxxxx>
Date: Wed, 04 Jun 2003 06:33:25 +0200
In-reply-to: Your message of "Tue, 03 Jun 2003 14:44:18 PDT." <874D84E8-960C-11D7-94D4-0003937E1CFC@xxxxxxxxxxxxxxxxx>
Reply-to: computer-go@xxxxxxxxxxxxxxxxx
Sender: owner-computer-go@xxxxxxxxxxxxxxxxx

Peter Drake wrote:
> Is the following statement true?
> 
> If a stone played at a point is the first stone to ever occupy that 
> point, no subsequent full-board position can be identical to a 
> preceding position.

Definitely not, it doesn't even hold for a basic ko. I.e., assume that
this position has been reached without captures:

......
..OX..
.O.OX.
..OX..
......

Black takes the ko, playing the first stone ever at that vertex

......
..OX..
.OX.X.
..OX..
......

If O immediately recaptures we get a counterexample.

/Gunnar Farnebäck

Follow-Ups:
- Re: computer-go: Ko
  - From: Chris Fant
- Re: computer-go: Ko
  - From: Peter Drake

References:
- computer-go: Ko
  - From: Peter Drake

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