Nice game, but it's either a bug or it's cheating.

I see it taking pebbles where there shouldn't be an option to, such as taken side lines. I had both corners on the left, then a complete left line, and when taking diagonals it also retakes white pebbles.

I'll try to screen the behavior. it wouldn't hurt if it waited a little while before playing. Or an indicator of where it placed its move, because it's not verifiable.