A simplistic model that helps explain this is golf.   On a single hole, even
a casual golfer has a realistic chance of out-golfing Tiger Woods.  Tiger
occasionally shoots a 1 over par on some hole and even weak amateurs
occasionally par or even birdie a hole.    It's not going to happen a lot,
but it's not ridiculous either.   Years ago I taught a player how to golf,
and on his third time out with me,  he hit a hole in one on a short par
3.     If Tiger Woods had been playing with us, he would have lost that hole
to this beginner.

But in a 9 hole match,  the odds go down enormously - for all practical
purposes there is no chance.

I kind of think of GO like that, even though it's a pretty simplistic
model.   Each move is like a hole of golf,  it can be a good "shot" or a bad
one.     With GO, however, probably a LOT of your moves are just as good as
the moves of a good player.   But it's the ones that fall short, that kill
you.

Go on a big board is like 18 holes of golf  compared to just 1 or 2 holes of
golf.   The better player is far more likely to win the 18 hole match than
the 1 hole match.

- Don





On Tue, Apr 28, 2009 at 1:53 PM, Ivan Dubois <[email protected]> wrote:

> I noticed that, in general, changes in the playout policy have a much
>> bigger impact on larger boards than on smaller boards.
>>
>> Rémi
>>
>
> I think rating differences are emplified on larger boards. This is easy to
> see if you think about it this way :
>
> Somehow a 19x19 board is like 4 9x9 boards. Let us define a new game that I
> would call 4-Go where instead of playing one game, you play simultenously 4
> games and determine the winner by calculating the sum of the scores of the
> four games. Certainly rating differences would be bigger with 4-go than with
> go (given the same two players). This explains why rating differences are
> bigger on 19x19 than 9x9.
>
> Ivan
>
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>
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