ZKGBAI 0.8.2(r2)
0.8.2 is mostly a performance release. In addition to reducing memory consumption considerably, it also improves worst-case performance to the point where it should no longer turn late game into a slideshow. Average case performance is still mostly the same, however. Aside from that there are also a few behavioral improvements, and it should be significantly more challenging overall.
Note: the earlier released version had an incorrect AIInfo file! Oops.