(;CA[gb2312]AB[db][dc][cc][dd][ed][fc][gc][hc][ib]AW[he][ha][ia][jb][jc][je][fd]
[fe][ee][de][cd][cf][bc][bd][bb][cb][ec]LB[ec:A]C[Black first to live.

Note that black already have a secured eye at A, and now it needs to make another one to live.]
AP[MultiGo:4.4.4]SZ[19]AB[da]MULTIGOGM[1]

(;B[ga]C[Answer]
(;W[gb]C[White's strongest response to 1 would be atari.];B[fa];W[fb];B[hb];W[ea]
;B[ga]C[Black 7 is very important.];W[fa];B[eb]C[Black lives.])
(;W[eb]C[Black ];B[fb];W[hb];B[ea]LB[gb:A]C[if white chooses to extend at 1, black must respond by limiting white's liberty at 2.

Since white can't play at A, black has successfully made two eyes.]))
(;B[eb];W[fa]C[If black tries to capture at 1, it fails because white will invade at 2])
(;B[gb];W[eb]C[When black plays 1 to make a larger eye, white extends at 2 and black fails.]))