[Computer-go] Chinese vs Tromp-Taylor rules

Urban Hafner contact at urbanhafner.com
Fri Mar 6 03:53:39 PST 2015

I had a look at the way KGS scores games, and I think I'm OK with just
using the same rules as on CGOS, right? As long as I don't implement
final_status_list and kgs-genmove_cleanup everything should work as
expected and I can assume all stones on the board are alive, right?


On Fri, Mar 6, 2015 at 10:25 AM, Urban Hafner <contact at urbanhafner.com>

> Hey everyone,
> I'm still at the early stages of development of my bot
> <https://github.com/ujh/iomrascalai>. Right now it only supports
> Tromp-Taylor rules as this is what CGOS uses (well, almost). This is a bit
> problematic, as for one my bot and GnuGo seldomly agree on a score (even
> when running GnuGo 3.8 with "--chinese-rules --positional-super-ko
> --capture-all-dead --score aftermath --play-out-aftermath") so running
> benchmarks against GnuGo isn't completely useful. The other problem is of
> course that Nick uses chinese rules for his KGS tournaments.
> Now my question is what exactly do I have to do to implement chinese
> rules? If I understand the differences correctly, the only difference
> between TT and Chinese are (I somehow couldn't find any mention of
> positional super ko in the TT rules on Senseis
> <http://senseis.xmp.net/?LogicalRules>, but IIRC both use PSK):
> 1. Suicide isn't allowed in chinese rules
> 2. Dead stones are removed before scoring in chinese
> Now #1 is simple and I've already implemented it as it's used by CGOS, but
> how would I handle #2? I guess it needs to be a reasonably fast as it
> should be used even in the playouts. It seems like a rather difficult and
> error prone approach, or is there a quick way to find groups that are 100%
> alive?
> The alternative would be to continue using TT rules internally and just
> play until there are only single point eyes left on the board.
> Urban
> --
> Blog: http://bettong.net/
> Twitter: https://twitter.com/ujh
> Homepage: http://www.urbanhafner.com/

Blog: http://bettong.net/
Twitter: https://twitter.com/ujh
Homepage: http://www.urbanhafner.com/
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