https://www.101weiqi.com/
if I fail tsumego, I choose random tsumego of 1 level weaker
if I solve tsumego on 1st try, I choose random tsumego of 1 level harder
started at 15k, not even once solved 1d level tsumego after 1400+ of iterations
green is separate 100 average - in the last 200 level is same as in iterations 300-400
