Life In 19x19

mitsun wrote:

RBerenguel wrote: ... I'm starting with the assumption that most solid questions are between 3k-5k, and as such, answering them correctly tends towards 3k-5kyushness.

That is the mathematical mistake. Answering any question correctly should make your rating move upward (tend toward +infinity). Of course the gain will not be large unless the question is difficult for your current rating. But a decrease indicates a problem with the rating algorithm.

For the mathematically inclined, think of Bayes' theorem. We have a prior probability (rating distribution based on previous answers), plus a new piece of information (correct answer to a problem at a particular difficulty level), and we want to derive a new probability (rating distribution based on all answers). How does inclusion of the new information alter the probability? The new information is consistent with any rank above the difficulty of the problem, but actually becomes more likely as that rank increases, even for ranks well above the problem difficulty. So the new distribution must be pulled toward higher ratings by the inclusion of the new information.

You have answered 848 positions. By my estimate your rank is between 10.9 Kyu and 3.3 Dan.

You have answered 3319 positions. By my estimate your rank is between 5.0 Kyu and 4.9 Kyu.

foe wrote:I'm about 10k kgs, after 1800 answered it has me pegged at 4.9k as well. Hmmmmm.
I am digging it though, the questions presented seem suitable to my level, and I am learning some shape and fighting techniques.

oca wrote:it is up and running now for me.

Bonobo wrote:

oca wrote:it is up and running now for me.

So … can you actually solve problems there? For me it is online, yes, but it doesn't show me any problems, instead I still get the message shown above.

Sennahoj wrote:Works fine for me !