(;
GM[1]
SZ[19]
AW[dd][fc][kd][qj][qm][dq][fq][co][cp]
AB[pd][qg][pp][mq][do][dn][cn][dj][cf]
C[Problem 68. Black to play.  

The fuseki is coming to a close, but there are still important points left. Where is Black's biggest move ? ]
(;B[ef]
TE[2]
C[Correct Answer.  

Black 1 is the biggest move. If White were to play there, she would be able to build a moyo at the top. ]
;W[rp]
LB[qo:A]
C[White 2 is necessary to prevent Black A, which defends the corner and attacks the white stones. ]
;B[gd]
C[However, Black will now reduce White's potential territory at the top with 3 ... ]
;W[gc];B[id]
C[... and 5. <= ]
)
(;B[qo]
C[Failure.  

Black 1 is certainly a big point, but ... ]
;W[ef]
C[... White will force with 2, building a moyo at the top, ... ]
;B[dh];W[nc]
TR[qg]
C[... then approach with 4. Note that the marked black stone is two spaces away from the white formation below, so White's stones there are not being attacked all that severely. <= ]
)
)