hoshi911: Seki is fine. However, I count one more exclusive liberty for black (9 vs 8 in the solution), because white has to play C19 and A13 before it can fill all the lieberties of black.
d4rkm4tter: You are right. I missed that white has to play C19.
Seki is fine. However, I count one more exclusive liberty for black (9 vs 8 in the solution), because white has to play C19 and A13 before it can fill all the lieberties of black.