(;
GM[1]
SZ[19]
AW[nc][nq][cq][dq][fq][cn][dm][hc][be][ed]
AB[pj][dj][dp][pd][pp][dd][pf][qm][ip][co][dn][en][fc][cm][bd]
LB[ed:2][bd:1]
C[Problem 67. Black to play.  

The game in Problem 63 continued with Black defending the corner with 1 and White attaching at 2. What should Black do now ? ]
(;B[ee]
TE[2]
C[Correct Answer.  

Black has the choice of taking the corner or building a wall. Since he is rather thick below, he prefers to have a wall facing towards the bottom, so he will hane on top with 1. ]
;W[dc]
C[White next plays 2 ... ]
;B[cd];W[ec]
C[... and 4 and, ... ]
;B[fd];W[fb];B[gb];W[eb];B[gc];W[bb];B[df];W[bc]
LB[ab:A]
C[... up to 12, she is alive, but confined to the corner. Note, that if White omits this move, Black A kills the corner. ]
;B[hd]
C[Black has made a thick wall facing down the left side and across the top. This is a great success for Black.  <= ]
)
(;B[ce]
C[How the game continued.  

Black actually did make a wall facing down the left side with 1 ... ]
;W[ec];B[dc];W[eb];B[ee];W[fd];B[fe];W[db]
(;B[cb]
LB[db:8]
C[... and he got the corner territory, too, but his wall was not as thick as in the Correct Answer because White established a position at the top with the sequence to 8 and ... ]
;W[df]
C[... somewhat nullified the influence of Black's wall with 10 ... ]
;B[de];W[dh]
C[... and 12. See Problem 71 for the continuation. <= ]
)
(;B[he]
C[Black should have played 9 here to increase the breadth of his moyo. <= ]
))
)