(;
GM[1]
SZ[19]
AW[cd][ce][dc][fc][dp][cn][cq][cr][jp][ko][kp][kq][mq][qj][ph][qf][rf][re]
AB[de][df][cf][dj][cl][dr][fq][hp][jq][iq][lp][oq][qp][pn][ql][qe][rd][pd][nd]
LB[qc:B][lc:A][fe:C]
C[Problem 137. White to play.  

After Black plays the marked stone, the only interesting points remaining are at the top. Does White have any special stratagem at B or is there something else she should do ? ]
(;W[lc]
TE[2]
C[Correct Answer.  

There are no special tricks that White can pull off in the corner, so it is best for her to play 1, ... ]
;B[nc]
C[... forcing Black to defend at 2. ]
;W[id]
C[She can take up a position on the top with 3. The middle game now begins. <= ]
)
(;W[fe]
C[Failure.  

A move like 1 does nothing to improve White's position. ]
;B[kc]
LB[qd:B][qc:A]
C[Black 2 strengthens his weak stones at the top and takes profit besides. If White now peeps at A, Black simply connects at B and the stone at A is lost. <= ]
)
)