(;
GM[1]
SZ[19]
AW[dd][dp][jp][qf]
AB[pq][pk][pd][jd]
LB[qf:1]
C[Problem 75. Black to play.  

Black welcomes White's approach at 1. Now he can utilise the power of his Chinese-opening formation to attack White. Where is the strongest move ? ]
(;B[qe]
TE[2]
C[Correct Answer.  

Black should attach at 1, ... ]
;W[pf]
C[... forcing White to stand at 2. ]
;B[nd];W[pi]
TR[pk]
C[Because of the marked stone, White can extend only as far as 4. Next, Black will attack the three white stones. <= ]
)
(;B[nd]
C[Failure.  

Black 1 is a bad move. ]
;W[rd]
C[White can settle her stones by sliding to 2 ... ]
;B[qc];W[qi]
TR[pk]
C[... and extending to 4. As a result, the marked stone is misplaced and Black's Chinese-opening strategy has fallen apart. <= ]
)
(;B[qh]
C[Failure.  

The pincer of Black 1 is not good. ]
;W[qc]
C[White will invade with 2. ]
;B[qd];W[pc];B[od];W[rd];B[re];W[rc];B[qe];W[nc]
LB[po:A]
TR[pk]
C[After White 10, the marked stone is too near the thickness above. This stone would be more efficient if it were at A. <= ]
)
)