(;
GM[1]
SZ[19]
AW[qc][qd][qf][kc][ic][nc][jd][gb][fq][dq][cq][cn][fn][nq][no][lo]
AB[pj][dj][dp][pd][pp][dd][jj][pc][oe][kd][gd][og][ld][md][cp][eo][em][ip][lq][pn][nm][cg]
LB[nq:1][lq:2][no:3][pn:4][fq:5][nm:6][lo:7][cn:9]
TR[gb][cg]
LB[ip:8][eo:10][cq:11][cp:12][dq:13][em:14][fn:15]
C[Problem 89. Black to play.  

After the exchange of the marked white and black stones (White 4 - Black 5 in the game in Problem 85), the sequence to the peep of 15 was played. How should Black respond ? ]
(;B[fo]
TE[2]
C[Correct Answer.  

Countering the peep by pushing out with 1 shows a positive attitude, refusing to be bullied by White. ]
;W[en];B[dn];W[dm];B[do];W[gn];B[dl];W[cm];B[go];W[hn];B[el];W[ho];B[hp];W[gp];B[eq];W[er];B[gq];W[bp];B[bo];W[co];B[bq];W[fp];B[ap];W[ep];B[bp]
C[With the sequence to 25, Black has secured the left side. ]
;W[gr]
C[Next, White secures her stones in the lower left with 26 and ... ]
;B[ko];W[kn];B[jn];W[jo];B[kp];W[jm];B[ln];W[km];B[mo];W[mn];B[mp]
C[... Black rescues his stones at the bottom with the sequence to 37. ]
(;W[np]
C[If White 38 next, ... ]
;B[mm]
C[... Black ataris at 39. <= ]
)
(;W[mm]
C[If White 38, ... ]
;B[np]
C[... Black links up his stones on the right by pushing through at 39. <= ]
))
(;B[en]
C[How the game continued.  

Black defended against the White peep with 1, ... ]
;W[ep]
(;B[bp]
LB[ep:2]
C[... then descended to 3 against White 2. ]
;W[fo];B[gl]
C[Black played 5 to build a moyo along the left side, but ... ]
;W[in]
C[... after White capped at 6 the two black stones at the bottom had to fight for life. <= ]
)
(;B[fp]
LB[ep:2]
C[How Black should have played.  

After White 2, Black should force with 3, ... ]
;W[eq];B[bp]
C[... then descend to 5. ]
;W[gp];B[fo];W[go];B[in]
LB[gn:B][gm:C][fm:A]
C[Now White can't confine Black to the bottom. After 9, Black threatens to build a moyo with the sequence Black A - White B - Black C. <= ]
))
)