(;
GM[1]
SZ[19]
AW[dd][dp]
AB[pp][pd]
LB[pd:1][dd:2][dp:4][pp:3]
C[Problem 45. Black to play.  

Both Black and White have made niren-seis. If Black wants to make an approach move on the left, where should he play ? ]
;B[fc]
TE[2]
C[Correct Answer.  

Black 1 is the usual approach move. ]
(;W[df]
C[If White answers with 2, ... ]
(;B[jd]
LB[cn:A][cf:A]
C[... Black will extend to 3. Approaching between White's niren-sei formation at the points A D is rarely played. <= ]
)
(;B[db]
LB[df:2]
C[Variation.  

In response to White 2, Black could also play the sequence from Black 3 ... ]
;W[cc];B[ic]
C[... to Black 5. <= ]
))
(;W[hc]
LB[jp:W][pj:B]
C[Depending on the circumstances.  

If Black had a sanren-sei formation on the right (suppose Black B - White W), the sequence in the Correct Answer might not be to White's liking because Black would have built up a large moyo. In that case, she would pincer with 2, ... ]
;B[cc];W[dc];B[cd];W[de];B[db];W[eb];B[cb];W[ec]
C[... making a thick position with the sequence to 10. ]
;B[cf]
C[<= ]
)
)