haha I feel your pain on the GoBase problems
some people say it's best to play without seeing any answers, so maybe you're lucky
Getting a go board and reviewing / memorizing (first 50~100 plays) some games (Takemiya Masaki ones... I am such a takemiya fanboy haha) got me from 15k to 10k I think, definitely buy one! It's such a pleasure to have a beautiful Goban and drink tea while immersing yourself in the game, feeling the stones and the teacup on your hand
