[Computer-go] CGT in Clobber ?!

Xavier Combelle xavier.combelle at gmail.com
Wed Jul 15 10:51:41 PDT 2015

I wonder what was the algorithm for your first bot. Alpha Beta ?

2015-07-14 9:45 GMT+02:00 "Ingo Althöfer" <3-Hirn-Verlag at gmx.de>:

> Hello Josef, hello all,
> "Josef Moudrik" <j.moudrik at gmail.com>
> > ... As far as I know, combinatorial game theory is not used
> > in modern Go engines, despite its nice theoretical properties.
> Let me tell you an anecdote from CGT history: In Februar 2002, there
> was a week-long conference on "Algorithmic Combinatorial Game Theory"
> in "Schloss Dagstuhl" (Germany). It was years before the Monte Carlo
> revolution, and in those days many hopes for strong go bots were
> on CGT.
> In the beginning of the week, the simple board game Clobber
> (perfectly suited for use of CGT) was introduced - and a human
> Clobber tournament was planned for the evenings.
> I proposed to write a Clobber bot (without using CGT), and
> two other participants followed me. Within hours, our bots
> were ready. And they crushed the humans (on 6x5 board size)
> terribly. So, "we" were excluded from the evening tournament
> (and had to play our own bot competition).  The only comment on
> my bot by senior Elwyn Berlekamp (one of the fathers of modern
> CGT; co-author of "Winning ways") was: Why does it have such an
> ugly graphical interface?  It seemed, Prof. Berlekamp was dis-
> appointed by the fact that Clobber bots were so strong without
> using any CGT.
> Photo with (almost) the whole group of 2002-participants:
> https://www.dagstuhl.de/Gruppenbilder/02081.A.B.JPG
> In the very first row (sitting): third person from left
> is John Tromp (the man from the Tromp-Taylor rules, from
> the Tromp-Cook bet, from go position counting and and and).
> In the same row the man with the diagonal go board is
> Martin Mueller. Directly behind Martin stands Richard Nowakowski
> (with red shirt), co-inventor of Clobber (in Summ,er 2001, together
> with M.H. Albert and J.P. Grossman).
> https://www.dagstuhl.de/en/program/calendar/semhp/?semnr=02081
> Looking forward to meet you in Liberec!
> Ingo.
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