(;
GM[1]
SZ[19]
AW[cf][hc][nc]
AB[dd][fd][kc][pd][pf][qj]
LB[kc:1]
C[Problem 41. White to play.  

Black has invaded deeply with 1. How should White play ? ]
;W[he]
TE[2]
C[Correct Answer.  

White should first exchange 1 ... ]
;B[ff]
C[... for Black 2, ... ]
;W[pc]
C[... then attach with 3 ... ]
;B[qc];W[qb]
C[... and 5, ... ]
;B[rb]
C[... hoping to lure Black in to playing 6. ]
;W[ke]
C[White then caps the black stone with 7. <= ]
;B[ld]
C[Running away with 8 is natural, but ... ]
;W[le];B[md];W[qd]
C[... then White switches to the corner and ... ]
;B[rc];W[pe];B[od];W[nd]
LB[qd:11][pe:13]
C[... forces with 11, 13, and 15. ]
;B[oe];W[ne]
C[After White 17, the black stones in the center are trapped. <= ]
)
)