[computer-go] MoGo/professional challenge

[Olivier Teytaud]

> The million dollar question:   How well does Mogo scale on this number
> of processors?    Can you give us at least some kind of generalization?

unfortunately, using more than 10 nodes is probably not very very useful
in 9x9, for the moment - but we have not tested that sufficiently,
and we have not sufficiently tuned the parameters. A cluster is usefull 
for tuning a sequential algorithm, but we need a cluster of clusters to
tune a parallel algorithm. Clearly, 1000 nodes for launching 40 mogo of 25
machines would be very helpful :-)

In 19x19, we can use much more - but humans are really too strong. Winning 
97% against mogo is not sufficient for winning against humans who beat
mogo with probability 80%, and I'm also not sure that winning 97% against 
the old mogo is sufficient for winning against CrazyStone :-)

One hope is that thanks
to parallelization, heavy playouts come for free - this is 
clear in the multi-core parallelization, I guess that to some extent
multi-nodes parallelization has a similar effect for different reasons.
So, I believe in heavy playouts, whenever on sequential codes it might
be a bad idea :-)
Olivier