(;
GM[1]
SZ[19]
AW[cd][ce][cg][di][fd][gf][id]
AB[dp][pd][pp][eh][ef][de][dd][ec][kd]
LB[kd:6][id:3][fd:11][gf:7][ec:2][cd:1][dd:12][ce:9][de:8][ef:4]
LB[cg:5][eh:10][di:13]
C[Problem 155. Black to play.  

How should Black play after the sequence to White 13 ? ]
;B[cc]
TE[2]
C[Correct Answer.  

Black should settle his stones with the two-step hane of 1 ... ]
;W[bc];B[bb]
C[... and 3. ]
;W[cb]
C[If White takes the corner with 4 ... ]
;B[dc]
(;W[ab]
C[... and 6, ... ]
;B[cf]
LB[ab:6]
C[... Black wedges in at 7 and White is at a loss for a good move. Therefore White should not play 6. <= ]
)
(;W[bd]
LB[dc:5]
C[Variation.  

After Black connects at 5, White should connect at 6. ]
;B[ab]
C[Black can settle his stones in the corner by descending to 7. Next, ... ]
;W[kf]
C[... White must look after her stones at the top, so she caps with 4, but ... ]
;B[nd]
C[... Black just maps out territory in the upper right with 5. <= ]
)
)