(;
GM[1]
SZ[19]
AW[cd][dc][ec][cf][qf][qg][ph][oh][qi][ri][rj][jq][qn][qp][qq][rr][oj][ol][pl][pm][qm][ro]
AB[dp][pd][pp][fc][fd][ed][jd][nd][qh][pi][pj][qj][rk][gq][qr][pr][pq][ql][nk][nl][om][pn][po][qo]
TR[oj]
C[Problem 161. Black to play.  

How should Black attack the white stone at the bottom after White plays the marked stone ? ]
(;B[lq]
TE[2]
C[Correct Answer.  

Even though it is a bit close to Black's thickness, Black 1 is a powerful move. It denies the white stone a base and forces it out into the center where it is confronted by black thickness on the right and a stable position on the left. ]
;W[jo]
C[When White jumps out to 2, ... ]
;B[jm]
C[... Black caps with 3 and White is in trouble. <= ]
)
(;B[jo]
C[How the game continued.  

Black immediately capped with 1, but ... ]
;W[mq]
C[... this let make White make a base for her stones by extending to 2. ]
;B[lr];W[lq];B[kr]
LB[lr:3]
C[Next, Black tried to uproot the white stones with 3 and 5, but ... ]
;W[kq]
C[... these moves were not very good. <= ]
)
)