(;
GM[1]
SZ[19]
AW[fd][ec][dc][cc][df][cl][el][fq][lq]
AB[dp][pd][pp][dd][cd][ed][fe][ci][ei][dn][fn][nq]
TR[df]
C[Problem 136. Black to play.  

The marked white stone is on the vital point. How does Black make good shape ? ]
(;B[bc]
TE[2]
C[Correct Answer.  

Black's stones are short of liberties, but, by playing 1, he makes White's stones short of liberties too. ]
;W[bb]
C[White blocks at 2 and, ... ]
;B[bd]
C[... when Black connects at 3, ... ]
;W[gd]
LB[fc:A]
C[... White must extend to 4 to defend against the cut at A. ]
;B[ef]
C[With 5, Black secures the territory in the upper left. <= ]
)
(;B[gd]
C[How the game continued.  

Black 1 was sente, but it was bad because it strengthened White and eliminated her bad aji. ]
;W[fc];B[bc];W[bb];B[bd];W[ge];B[ff];W[he];B[gi]
C[After the sequence to Black 9, ... ]
;W[ee]
C[... White cut at 10 and it was Black who was left with bad aji. <= ]
)
)