Li Changho Jingjiang Weiqi Sihuo / Errata

Book Solution  

Solution given in the Book, but white's best response to 1 is to play 2 at 3.

Solution  

After white plays 2, black is left with no choice but to try to make a second eye by playing 3 and 4. If black plays 4 first, white plays at 3, leaving black with only one eye. So black plays at 3 and white plays at 4 to prevent black completing his second eye. Both are left with two liberties in seki.

Solution ( at )  

unkx80: Allowing black to make two eyes means giving black 3 points. The capture at is worth more than 3 points...