jefk wrote:
Sanny wrote:
In Chess after every move new 30-40 moves are generated.

well Sanny, that might be correct, but many of these moves are
tactical mistakes, or give away material immediately. and with
perfect play the game in such a case is subsequently lost (excluding
some deep combinations, but these are recognized in 99.99999 % of
the cases by an engine as Rybka imho);

so in reality/practice, there are about 3-12 moves possible for each
side, in sharp play sometimes there's only one correct move, in
positional play/endgames there might even be sometimes more moves
possible than 12; in any case its much less than the 3-40 you
mention

You're begging the question. You can't know that all of those moves
are tactical mistakes until you've analyzed them fully. Now, if all
you're interested in is playing *good* chess, it's acceptable to have
a quick look at these moves and throw them away if they don't come
good within a few ply. However, if you want to play *perfect* chess,
you have to look at absolutely everything. It might just be that the
winning strategy for White involves a queen sacrifice on move five
that doesn't pay off until move 100. Staggeringly unlikely but still
possible.

To Solve Chess we need to search till atleast 100 depth. That will
take even more than Billions of Billions of Billions of years

we don't have to fully analyze the game i think.

You can't *solve* chess without fully anazlyzing it.

for every winning plan for white, i believe there exists a proper
defence system for black.

For a *winning* plan for white there is, by definition, no proper
defence. If there were a proper defence, the plan wouldn't be
winning!

(there exist of course some simple games where all possibilities
*can* be calculated , and it's proven with 100 % certainty they are
a draw, but indeed such a method does'nt seem possible for chess, at
least for some millennia)

Agreed.

example, although i'm not an expert in the game of draughts (or
checkers), from what i've vaguely read/seen in some articles, the
scientific/ computer games community seems to be convinced these
games are a draw, even although they haven't fully calculated all
possibilities;

Schaeffer et al have fully solved checkers.


Dave.

--
David Richerby Confusing Cheese Cat (TM): it's like
www.chiark.greenend.org.uk/~davidr/ a cat that's made of cheese but you
can't understand it!