(;
GM[1]
SZ[19]
AW[qf][cn][hq][nq][fl][dl][cp][co][bp][dg][cg]
AB[pj][dj][dp][pd][pp][dd][fc][nc][fq][qm][fj][bo][bq][cq][fo][cf]
TR[cg]
C[Problem 61. Black to play.  

After White played the marked stone in Problem 57, what was the best way for Black to continue ? ]
(;B[df]
TE[2]
C[Correct Answer.  

It is usually not a good idea to chase stones from behind with a move like Black 1 because it strengthens the opponent, but here it's an emergency measure which stops White from making sabaki. This move also reinforces Black's corner. ]
;W[eg]
C[If White extends to 2, ... ]
;B[hj]
C[... jumping out into the center with Black 3 is good style because it prepares for an attack on White's stones above. ]
;W[hg]
C[Even if White jumps out to 4, Black can concentrate on attacking because his stones above are secure. <= ]
)
(;B[gg]
C[How the game continued.  

Black tried to confine White on a large scale with 1, ... ]
;W[ce]
C[... but White was able to make sabaki by clamping with 2 ... ]
(;B[df];W[bf];B[cd];W[de];B[ef];W[ee]
C[... and playing the sequence to 8. Black's attack failed. <= ]
)
(;B[cd]
C[Black should have played 3 here. ]
;W[bf]
C[If White 4 next, ... ]
;B[bd]
C[... Black 5 would secure the corner. <= ]
))
)