(;
GM[1]
SZ[19]
AW[bd][dd][fc][dr][fq][iq][pp][oq][ol][ql][lc][me]
AB[cf][ef][dj][dp][cq][dn][qj][oj][od][qd][jc][kd]
LB[lc:A][kd:B][me:C]
C[Problem 41. Black to play.  

How should Black continue after the sequence to White C ? ]
(;B[nc]
LB[ld:A]

TE[2]
C[Correct Answer.  

Black should first defend the corner with 1, threatening to take the territory at the top by playing at A. ]
;W[ld]
C[White defends at this point with 2. but ... ]
;B[kf]
C[... Black continues the attack with 3 ... ]
;W[mg];B[lh]
C[... and 5. The white stones are in trouble. <= ]
)
(;B[ld]
C[Failure.  

Cutting trough with Black 1 ... ]
;W[md];B[mc]
C[... and 3 is crude. ]
;W[nc];B[mb];W[oc]
LB[lb:A]
C[Note that after White 6, White threatens to capture the two marked stones by playing A. ]
;B[lb]
C[Black can capture one stone with 5 and 7, but ... ]
;W[pd];B[pe];W[pc]
C[... Black's corner in the upper right has been destroyed. <= ]
)
)