(;
GM[1]
SZ[19]
AW[jc][kc][lb][ld][md][nc]
AB[dd][hc][kb][lc][mc][mb][pd][pf][qj]
LB[md:6][mc:5][ld:4][mb:3][kc:2][kb:1]
C[Problem 19. Black to play.  

This time Black hanes from the other side and the moves continue to 6. What should Black do now ? ]
;B[nd]
TE[2]
C[Correct Answer.  

Black 1 is a good move, ... ]
;W[nb];B[la]
(;W[pc];B[od];W[qc]
C[... even when White can live in the corner with the moves to 6. ]
;B[jb]
C[After Black 7, ... ]
;W[je]
LB[rd:A]
C[... White must fix up her shape by playing at 8, while Black A is sente. Black is satisfied with this result. <= ]
)
(;W[na]
C[Variation.  

If White wants to attack on the left, she will play 4 here. ]
;B[ma];W[jb];B[oc];W[ne];B[od]
LB[ja:B][ia:A]
C[The moves continue up to 9, and Black gets a large profit in the corner. However, a white move at A or B, threatening Black's stones on the left and right, could later become troublesome. <= ]
)
)