(;SZ[19]AW[fo]AW[go]AW[ho]AW[bp]AW[cp]AW[dp]AW[ep]AW[ip]AW[jp]AW[kp]AW[lp]AW[mp]AW[np]AW[rp]AW[lq]AW[oq]AW[pq]AW[qq]AW[kr]AW[pr]AW[rr]AW[js]AB[im]AB[om]AB[jn]AB[ln]AB[nn]AB[io]AB[oo]AB[qo]AB[ro]AB[fp]AB[gp]AB[hp]AB[op]AB[bq]AB[cq]AB[dq]AB[eq]AB[iq]AB[jq]AB[kq]AB[mq]AB[nq]AB[lr]AB[nr]AB[or]AB[ls]AB[ms]LB[kq:2]LB[lq:5]LB[mq:4]LB[kr:1]LB[mr:3]LB[js:7]LB[ls:8]LB[ms:6]C[After the sequence, black makes the mistake of move 8. How to punish?]GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]RU[Japanese]KM[5.50]TM[]PW[White]PB[Black]PL[W] (;W[hq];B[hr]C[Of course. Black's only choice.] (;W[ir];B[gq];W[os] (;B[ks];W[ps];B[jr];W[ns];B[is];W[mr]C[Good, But black smartly took sente with L1RIGHT]) (;B[hq]C[this should actually be at L1];W[ps];B[jr];W[ns]C[RIGHT])) (;W[gq];B[fq] (;W[ir];B[gr] (;W[os];B[hq];W[ps];B[jr];W[ns];B[ks];W[mr];B[is]C[, and in sente, but the extra stone at g3 was unneccessary - no loss though.RIGHT]) (;W[hq];B[gq];W[os];B[hq];W[ps];B[jr];W[ns]C[RIGHT]) (;W[jr];B[hq];W[os];B[hs];W[ps];B[is];W[ns];B[ks];W[mr]C[Works, but not the best way to do things.RIGHT])) (;W[gr];B[ir] (;W[hs];B[fr] (;W[os];B[gs] (;W[ps];B[jr];W[ns]C[RIGHT]) (;W[ks];B[is];W[ps];B[jr])) (;W[gs];B[ks] (;W[os];B[jr];W[ps];B[is]) (;W[is];B[jr];W[kr]C[RIGHT]))) (;W[os];B[jr];W[ps];B[ks];W[ns];B[is];W[mr]C[RIGHT]) (;W[is];B[gs];W[os];B[ns] (;W[ps];B[hs]) (;W[ks];B[ps];W[qs];B[hs])))) (;W[os];B[ns] (;W[ps];B[is] (;W[ir];B[gq];W[hs];B[gs] (;W[ks]C[RIGHT]) (;W[jr];B[hq]C[White ran out of liberties; ko at most])) (;W[gq];B[fq] (;W[ir];B[gr];W[hs];B[hq];W[ks]C[RIGHT]) (;W[gr];B[ir])) (;W[fq];B[gq])) (;W[ir];B[gq] (;W[ps]C[RIGHT]) (;W[ks];B[ps];W[qs];B[hs];W[os]C[Hard ko for black, but white could have succeeded without ko.])) (;W[gq]C[NOTTHIS])) (;W[gr];B[gq];W[os];B[ns] (;W[ps];B[jr]) (;W[ks];B[ps];W[qs];B[is];W[os]C[Ko is not necessary.]))) (;W[ir] (;B[hr] (;W[os];B[ks];W[ps];B[jr];W[ns];B[is];W[mr]LB[hr:A]C[, Right, black couldnt connect...RIGHT]) (;W[jr];B[hq];W[os];B[ns]) (;W[hs];B[ks])) (;B[ks]C[another big mistake by black];W[hq]C[snapback.RIGHT]) (;B[hq]C[this wont work])) (;W[hr];B[hq]C[this wont work]) (;W[os];B[ns] (;W[hq];B[hr] (;W[ir];B[gq] (;W[ps]C[RIGHT]) (;W[ks];B[ps];W[qs];B[hs];W[os]C[Black will have a hard time winning this ko, but white could have done without ko.])) (;W[ks];B[ps] (;W[qs];B[is];W[os]C[Ko is unnecessary.]) (;W[ir];B[gq] (;W[qs];B[hs];W[os]C[Black will have a hard time winning this ko, but white could have succeeded without ko.]) (;W[hs];B[hq]))) (;W[ps];B[is] (;W[ir];B[gq];W[hs];B[gs] (;W[ks]C[RIGHT]) (;W[jr];B[hq]C[White ran out of liberties; ko at most])) (;W[gq];B[fq] (;W[ir];B[gr];W[hs];B[hq];W[ks]C[RIGHT]) (;W[gr];B[ir])) (;W[fq];B[gq]))) (;W[ps];B[jr] (;W[hq];B[ks] (;W[fq]C[RIGHT]) (;W[hr];B[gr] (;W[gq];B[fq] (;W[is];B[fr]) (;W[fr];B[is]C[That's two eyes for black.])) (;W[is];B[gq])) (;W[gq];B[fq];W[ir];B[is]C[Two eyes for black])) (;W[ir];B[hq])) (;W[ks];B[ps] (;W[hq];B[hr] (;W[ir];B[gq];W[qs];B[hs];W[os]C[Black will have a hard time winning this ko, but white could have succeeded without ko.]) (;W[qs];B[is]C[Ko is unnecessary.];W[os]C[Ko is unnecessary.]) (;W[fq];B[gq] (;W[qs];B[is]) (;W[ir];B[hs];W[qs];B[is]))) (;W[qs];B[is]))) (;W[ps];B[os]) (;W[ks];B[os]))