(;
GM[1]
SZ[19]
AW[cc][dd][cf][cg][cn][dp][nq][mr][ns][or][pr][qq][qc][qd][qf][rf][jd][ke][jf][lg]
AB[dg][di][fq][lq][mq][np][pp][pn][pc][pd][pe][og][qh][db][fc][ic][id][ie][je]
TR[jd][ke][jf][lg]
C[Problem 27. Black to play.  

White has played lightly with the marked stones. How should Black attack them ? ]
(;B[li]
TE[2]
C[Correct Answer.  

Capping with Black 1 is the best way to attack. ]
;W[jh];B[jj]
C[White will probably live, but, even if she does, Black will build a large moyo below while attacking, and White will get minimum territory. <= ]
)
(;B[kd]
C[Failure.  

If Black cuts at 1, ... ]
;W[ld]
C[... White ataris at 2 and ... ]
;B[kc];W[le];B[lc];W[jh]
C[... makes eye shape with the sequence to 6. White will now have no trouble making a living group in the center and Black has no prospects of making a moyo. <= ]
)
(;B[kf]
TR[jd][ke]
C[Failure.  

Black can capture the two marked stones by cutting at 1, but ... ]
;W[kg];B[lf];W[mf];B[le];W[me]
C[... White can force with the sequence to 6, then ... ]
;B[ld];W[nh]
LB[md:A]
C[... make shape with the knight's move of 8. White should have no trouble getting eyes for her group. It is now her privilege to play at A and Black's three stones at the top are in danger of being cut off. <= ]
)
)