(;
GM[1]
SZ[19]
AW[dc][ce][pq][qo]
AB[ic][pd][nc][eq][cp]
C[Problem 84. White to play.  

Black has extended to 1. Where should White play so as to maintain the balance of territories ? ]
(;W[qi]
TE[2]
C[Correct Answer.  

It is imperative that White extends along the right side with 1. ]
;B[kq]
C[The remaining big points at 2 ... ]
;W[ck]
C[... and 3 will now be shared by Black and White. <= ]
)
(;W[ck]
C[Failure.  

If White extends to 1, ... ]
;B[qj]
C[... Black will make a double-wing formation from his corner enclosure in the upper right with 2. This in considered to be advantageous for Black. <= ]
)
)