Sorry I neglected a stone in the problem #2 in my last post. It should be Black: b4,b5,c2,c3,c4,d2 White: a7,b6,b7,c5,c6,d1,d3,d4,d5,e2,e3,f1,f2 Black moves first. If white attack from the other direction, similar result is obtained. Dan Liu