I would say no more than 10kyu (eg a14 a15) The fact that it is 19x19 in base 3 is not that suprising. If you visualize all possible positons (legal or not) th

I would say no more than 10kyu (eg a14 a15) The fact that it is 19x19 in base 3 is not that suprising. If you visualize all possible positons (legal or not) then you have 19x19 board of 3 states (black, white, note). So it's 3 * * (19 * 19). Which is 1 and 19 * 19 zeros in base 3. Only some of these positions are legal so the number is lower - quite a bit, that's why there are leading zeros in top left.