(;
GM[1]
SZ[19]
AW[fc][kd][nd][nc]
AB[dd][df][hc][oc][pd][pf]
LB[hc:1]
C[Problem 51. White to play.  

Black makes a deep invasion with 1. What should White do ? ]
;W[he]
TR[hc]

TE[2]
C[Correct Answer.  

Against the marked black stone, White will cap at 1. ]
;B[gd]
C[After Black runs away with 2, ... ]
;W[dc]
C[... White attaches at 3 and can easily make a living group in the corner. <= ]
)
)