(;
GM[1]
SZ[19]
AW[nc][nq][cq][dq][fq][cn][dm][hc][be][ed][db][eb][ec][fd][df][dh][cl][pc][ob][qb][bm][bo][gh][ph][pq][pr][qr][qp][rp]
AB[pj][dj][dp][pd][pp][dd][pf][qm][ip][co][dn][en][fc][bd][ce][de][ee][fe][dc][cb][ck][qc][qd][kd][ci][bj][go][cg][he][oq][qq][qo][po][lq]
TR[nq]
C[Problem 83. Black to play.  

The aji of the marked white stone seems to be troublesome. Should Black take countermeasures against it or should he play elsewhere ? ]
(;B[og]
TE[2]
C[Correct Answer.  

The bottom right is small. Black should go after bigger fish and attack the lone stone at the top with the sequence from 1 ... ]
;W[oh];B[nh];W[oi];B[mj]
C[... to 5. White's three stones in the upper right are now in grave danger and will probably be captured. <= ]
)
(;B[or]
C[How the game continued. Black's descent to 1 failed to keep White's stones from linking up. ]
(;W[nr];B[op];W[os]
LB[np:A]
C[After White 4, White was waiting for a chance to attack the black stones in the bottom left by pushing out with A. See Problem 87 for the continuation. <= ]
)
(;W[nh]
LB[or:1]
C[But White should have ignored Black 1 and jumped to 2 instead. <= ]
))
)