On Wed, Dec 14, 2011 at 2:42 PM, John Tromp <[email protected]> wrote:
> dear Robert,Don, > > On Wed, Dec 14, 2011 at 1:36 PM, Robert Jasiek <[email protected]> wrote: > > Would chess instead with superko be much more interesting for > combinatorics? > > On Wed, Dec 14, 2011 at 2:28 PM, Don Dailey <[email protected]> wrote: > > If there were no 50 move rule in chess, how would that change the > > calculation? > > If we disregard the 50-move rule, then we're left with the three-fold > repetition rule > as a means of avoiding infinite games. As stated, this merely allows > either side to > claim a draw, but for our purposes we must assume it forces a draw upon a > third > repetition. > > A superko rule may seem like a one-fold repetition rule, but is subtly > different, > since it forbids the repetition, rather than rule it a draw. Of > course, if no other > legal moves remain, then it becomes a draw by stalemate. But it may also > force > a player to choose a losing alternative. > > With either rule, chess games can be exponentially long, although > determining > lower and upper bounds is so much harder than in go, because of the complex > piece movements... > Yes. these rules all make analysis more difficult. I see that you are correct also about the 3-fold repetition rule, so if the 50 move rule is eliminated you must forbid repetition as illegal except on 3rd Tuesdays of the month. Don > regards, > -John > _______________________________________________ > Computer-go mailing list > [email protected] > http://dvandva.org/cgi-bin/mailman/listinfo/computer-go >
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