(;
GM[1]
SZ[19]
AW[cd][bf][dc][fc][gb][hb][ic][cn][cq][dq][fq][pn][nn][ph][ng][li][ne][nd][nc]
AB[hc][hd][ie][fd][ed][df][dk][bn][co][dn][dp][pp][np][lp][lc][le][oc][pd][pf][re]
C[Problem 130. Black to play.  

This position arose from the Correct Answer in Problem 75. Where should Black attack ?  

[You will find a supplement to this Problem Diagram as "Problem 149"] ]
;B[qi]
TE[2]
C[Correct Answer.  

Black 1 is a severe invasion. ]
;W[qh];B[rh];W[rg];B[ri];W[qg];B[pi];W[oh];B[ql]
C[Black's aim is to drive a wedge between White's positions above and below with the sequence to 9. ]
;W[rn];B[om];W[on];B[nk];W[qq];B[qp];W[rp];B[ni]
C[Note Black 17. ]
(;W[lf]
C[White must defend with 18 ... ]
;B[ke];W[lg]
C[... and 20, inducing Black to strengthen his stones there. ]
;B[lk]
C[After Black 21, White's stones are without eyes in a sea of Black influence. <= ]
)
(;W[mh]
C[If White responds with 18 here, ]
;B[mf]
C[... Black will peep at 19, ... ]
;W[nf];B[nh]
LB[og:A][mg:B]
C[... then play 21. The points A and B are now miai, so White can't avoid losing some stones. <= ]
)
)