(;
GM[1]
SZ[19]
AW[jc][kd][nc][nd]
AB[dd][hc][lc][oc][pd][pf]
LB[kd:2][lc:1]
C[Problem 28. Black to play.  

White counters Black's invasion with the diagonal move of 2. How does Black respond ? ]
;B[ld]
TE[2]
C[Correct Answer.  

Black plays 1 and ... ]
;W[le]
(;B[me]
C[... cuts with 3. ]
;W[md]
(;B[lb]
LB[nb:B][jb:A]
C[Black 5 is a steady move, threatening to link up his stones at A or B. <= ]
)
(;B[ke]
C[Black 5 here is also possible. <= ]
))
(;B[ke]
C[Variation.  

Black can also cut at 3 here. ]
;W[je];B[kf];W[me];B[lb]
LB[me:6][je:4]
C[After White plays 4 and 6, Black again descends to 7. <= ]
)
)