(;
GM[1]
SZ[19]
AW[cd][dc][ec][cf][ri][qf][of][rd]
AB[dp][pd][pp][pi][qc][nd][jd][fc][fd][ed]
LB[nd:4][qc:6][rd:5][qf:1][of:3][ri:7][pi:2]
C[Problem 142. Black to play.  

The joseki to White 7 has been played in the upper right corner. Where should Black play next ? ]
(;B[jp]
TR[pi]

TE[2]
C[Correct Answer.  

Black should treat his marked stone lightly and make a sanren-sei at the bottom. ]
;W[qn]
C[If White approaches at 2, ... ]
;B[np]
C[... Black defends at 3. Black now has mapped out territory at the top and the bottom. White is secure on the right, but her shape is depressed and small. <= ]
)
(;B[pg]
C[Failure.  

Black might feel good about securing his stones an the right ... ]
;W[pf];B[rh];W[qh];B[qi];W[rg];B[rj];W[sh];B[qk]
LB[ld:A]
C[... with the sequence to 9, but White has also become secure, so she can now aim to invade at A. <= ]
)
)