(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[Chris Oliver]
(;B[kq]
;W[jq]
;B[kp]
;W[jp]
;B[ko]
;W[jo]
;B[dl]
;W[dp]
;B[jr]
;W[ir]
;B[kr]
;W[hq]LB[hq:4][ir:2][jr:1][kr:3]C[Diagram 1 - A standard sequence. 
N.B. The stones on the left are only there to indicate that white does not have the ladder.]
;AE[dl][dp]AW[ep]AB[fn]LB[hq:4][ir:2][jr:1][kr:3]C[Diagram 1a
Black ladder breaker and white stone moved closer to shrink the diagram (star point can probably be omitted from the diagram).])
(;B[jq]
;W[kq]
;B[kp]
;W[lq]
;B[lp]
;W[mp]
;B[ip]
;W[np]
(;B[jr]
;W[kr]
;B[js]
;W[ks]LB[jr:1][kr:2][js:3][ks:4]C[Diagram 2a Sente])
(;B[kr]
;W[lr]
;B[ks]
;W[ls]
;B[jr]LB[jr:5][kr:1][lr:2][ks:3][ls:4]C[Diagram 2b Gote]))
(;B[cj]
;AW[ci][di][dj][ek][fk][gk][bp][bq][cq][dq][er][fr]AB[dk][cl][el][fl][gl][cn][bo][cp][dp][eq][fq][gq]
;W[bj]
;B[ck]
;W[bk]
;B[bl]LB[bj:1][bk:3][ck:2][bl:4]C[Diagram 3])
(;B[qi]
;AE[qi]AW[ci][di][dj][ek][fk][gk][bp][bq][cq][dq][er][fr][gr]AB[cj][dk][el][fl][gl][bo][co][cp][dp][eq][fq][gq]
;W[ck]
;B[dl]
;W[cl]
;B[cm]
;W[bm]
;B[bn]
;W[al]LB[ck:1][al:7][cl:3][dl:2][bm:5][cm:4][bn:6]C[Diagram4 - White takes more profit, but in gote.])
(;B[ck]
;AE[ck]AW[ec][fc][gc][cd][dd][be][cf][gg][ci][di][dj][ek][fk][gk]AB[eb][fb][bc][cc][dc][bd][cj][dk][dl][el][fl][gl]PL[B]
;B[bj]
;B[ag]
;W[bi]
;B[ai]
;W[bg]LB[ag:3][bg:6][gg:2][ai:5][bi:4][bj:1]C[Diagram 5 - This is good for black - probably worth about 5 points in sente, with a few more available later.])
(;B[qj]
;AW[ni][pi][qi][lj][mj][oj][rj][rp][pq][qq][rq][nr][or]AB[pj][lk][mk][ok][rk][ln][qn][ro][pp][qp][mq][nq][oq]
;W[pk]
;B[qk]
;W[nk]
;B[ol]
;W[nl]LB[nk:3][pk:1][qk:2][nl:5][ol:4]C[Diagram 6 - another small difference in the position allows white to punch a hole in to black territory. 

Continuations here are many and varied.
Black has lost points and can be forced to defend further.
White has many ko threats here.]))
