(;
GM[1]
SZ[19]
AW[dg][cn][fm][fj][eg]
AB[pj][dj][dp][pd][pp][dd][fd][fp][jq][eh]
LB[dg:1][fd:2][cn:3][fp:4][fm:5][jq:6][fj:7][eh:8][eg:9]
C[Problem 50. Black to play.  

This is a classic handicap go position. How should Black respond to White 9 ? ]
(;B[fi]
TE[2]
C[Correct Answer.  

Attacking with the diagonal move of Black 1 is the way to make good shape. ]
;W[gi]
C[If White hanes with 2, ... ]
;B[fh]
C[... Black plays 3 and the four stones on the left side make a shape knows as 'guzumi' in Japanese. White can no longer prevent Black from escaping into the center. ]
;W[gf]
C[White's two stones in the upper left are in great danger, so they must escape with 4, but, ... ]
;B[gh]
C[... with Black 5, all of White's stones are under attack. <= ]
)
(;B[fh]
C[How the game continued.  

Black extended to 1, but, ... ]
;W[dh]
C[... when White turned at 2, ... ]
;B[ei]
C[... he was forced to defend with 3 and was left with terrible shape. ]
;W[gf]
LB[hh:A]
C[Next, White jumped to 4 and, even  Black had jumped to A, White would have taken the initiative. <= ]
)
)