(;GM[1]FF[4]SZ[19]SO[bgj 204]AP[Sabaki:0.52.2]CA[UTF-8]GN[10 - tsumego advice 11]DT[2020-11-24]RU[Simple]AB[do][fo:ho][ep][bq:dq][fq][iq:ir][br]AW[fp:gp][eq:er][gq:gr][cr:dr]AE[ca:cb][pa:ph][ab][qb:rb][bc][dc:de][oc][re:rf][qh:rh][bl:bn][ol][ql][ao][co:cp][qo:ro][aq][oq:qq][nr:ns][pr:rr][bs]PL[B]C[page 10
advice for doing tsumego part 11
problem 1

Black to kill](;B[cs]TE[1](;W[ds];B[fs](;W[gs];B[fr])(;W[fr];B[gs]))(;W[gs];B[ds];W[es];B[fr]))(;B[fs]BM[1];W[gs](;B[fr];W[cs])(;B[cs];W[fr])))(;GM[1]FF[4]SZ[19]SO[bgj 204]AP[Sabaki:0.52.2]CA[UTF-8]GN[11 - tsumego advice 11 problem 2]DT[2020-11-24]KM[-7.5]RU[Simple]AB[rp][qq:qr][or:pr][sr][ps]AW[rn][qo:qp][so:sp][nq:ns][oq:pq][rq][os]AE[da:dh][qa:qb][bb:cb][sb][ec][pc:pe][rc][be:bf][bh:ch][cl][el][rl:rm][bo:co][cq:eq][sq][br:dr][fr:fs][rs]PL[B]C[page 11
advice for doing tsumego part 11
problem 2

Black to live](;B[rs]TE[1])(;B[rr]BM[1];W[rs]))(;GM[1]FF[4]SZ[19]SO[bgj 204]AP[Sabaki:0.52.2]CA[UTF-8]GN[11 - tsumego advice 11 problem 3]DT[2020-11-24]KM[-7.5]RU[Simple]AB[na:nc][pa][ra][oc:pc][qd:rd]AW[oa:ob][pb:qb][qc:rc]AE[da:dh][qa][bb:cb][sb][ec][pd:pe][be:bf][bh:ch][cl][el][rl:rn][bo:co][qo:qq][so][cq:eq][sq][br:dr][fr:fs][rs]PL[B]C[page 11
advice for doing tsumego part 11
problem 3

Black to kill](;B[sb]TE[1];W[sc];B[qa])(;B[qa]BM[1];W[sb];B[sd];W[sc])(;B[sc]BM[1];W[sb]))(;GM[1]FF[4]SZ[19]SO[bgj 204]AP[Sabaki:0.52.2]CA[UTF-8]GN[12 - tsumego advice 11 problem 4]DT[2020-11-24]RU[Simple]AB[bp:fp][fq:fs][cr][es]AW[bq:eq][br][er][ds]AE[ca:cb][pa:ph][ab][qb:rb][bc][dc:de][oc][re:rf][qh:rh][bl:bn][ol][ql][ao][co][qo:ro][aq][oq:qq][nr:ns][pr:rr][bs]PL[B]LB[cr:A][br:B]C[page 12
advice for doing tsumego part 11
problem 4

Black to kill
In this problem, A and B have already been exchanged](;B[aq]TE[1];W[ar];B[bs];W[dr];B[cs])(;B[bs]BM[1](;W[aq];B[ap](;W[jp];B[cs];W[as];B[ar])(;W[dr];B[ar];W[as]))(;W[dr];B[aq]))(;B[cs]BM[1];W[bs]))(;GM[1]FF[4]SZ[19]SO[bgj 204]AP[Sabaki:0.52.2]CA[UTF-8]GN[13 - tsumego advice 11 problem 5]DT[2020-11-24]KM[-7.5]RU[Simple]AB[em:eo][gm:gn][in:ip][bo][cp][bq:br][er][gr][ir:jr][cs]AW[fo:fp][ho:hp][cq:eq][gq][cr][hr][ds]AE[ba][na:nb][pb:rb][ac][cc:ce][oc:qc][ae][qe:re][bf:bh][oh][qh][pl:ps][ql:rl][rn:ro][do:dp][oq][ar][qr:rr]PL[B]C[page 13
advice for doing tsumego part 11
problem 5

Black to play])(;GM[1]FF[4]SO[bgj 204]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]AB[pr][ps][nr][oq][op][po][qo][ro]AW[qr][rq][rp][qp][pp][pq]C[page 13
journal problem 1

Black to play and kill.]GN[13 - problem 1](;B[rr](;W[sr];B[rs]C[If Black tries the 2-2 point the
group dies if this White 2.])(;W[rs];B[sr];W[sq]C[This White 2 lives.]))(;B[rs]C[This is the killing move - Black either connects out or takes away the eye shape.](;W[rr];B[qs];W[sp];B[sr])(;W[qs];B[rr])))(;CA[UTF-8]ST[0]FF[4]SO[bgj 204]AP[Sabaki:0.52.2]SZ[19]GM[1]GN[24 - pair go final ]PW[Wai Yi Chung and Ho Yeung Woo]KM[6.5]PB[Yanming Zhang and Yue Matt Xi ]PM[2]FG[259:]DT[2023-06-12]EV[BGA pair go championship]C[page 24
pair go final];B[pd];W[dp];B[pq];W[dd];B[fq];W[cn];B[qn];W[nc];B[qf];W[pc];B[qc];W[qb];B[oc];W[pb];B[nd];W[ob];B[od];W[mc];B[cc];W[cd];B[dc];W[ed];B[fb];W[eq];B[fp];W[hq];B[do];W[co];B[fn](;W[po];B[qo];W[pp];B[qp];W[oq];B[pr];W[no];B[jq];W[er];B[fr];W[iq];B[jp];W[ho];B[dn];W[dm];B[fl];W[em];B[fm];W[in];B[cp];W[cq];B[bp];W[ep];B[eo];W[cm](;B[kn];FG[259:]PM[2];W[il];B[gj](;W[lm];FG[259:]PM[2];B[km];W[kl];B[ln];W[mm];B[jl](;W[lp];FG[259:]PM[2];B[kk];W[ll];B[jm];W[jo];B[ko];W[kp];B[ip];W[hp];B[jr];W[hm];B[im];W[ik];B[jk];W[gk];B[fk];W[hj];B[gi];W[hi];B[gh];W[hh];B[mn];W[nn];B[nm];W[om];B[nl];W[lk];B[lj];W[mk];B[ol];W[mj];B[ki];W[li];B[kj];W[pm];B[pl];W[qm];FG[259:]PM[2];B[ql];W[rm];B[pi];W[or];B[rr];W[jn];B[is];W[mh];B[lh];W[mg];B[mi];W[ni];B[nj];W[li];B[hn];W[gn];B[mi];W[qq];B[qr];W[li];B[io];W[hn];B[mi];W[rn];B[ro];W[li];B[pn];W[on];B[mi];W[so];B[rq];W[li];B[op];W[oo];B[mi];W[sp];B[sq];W[li];B[hl];W[gl];B[mi];W[hs];B[hr];W[li];B[gm];W[hk];B[mi];W[ir];B[gs];W[li];B[kg];W[oj])(;FG[259:]PM[2]MN[1];W[jk];B[jm];W[hk];B[kk];W[ll];B[jj];W[ik];B[mn];W[nn];B[nm];W[lk];B[kj];W[lj];B[mp]))(;FG[259:]PM[2]MN[1];W[lp];B[jn];W[ij];B[kl];W[ej]))(;FG[259:]PM[2]MN[1];B[bq];W[cr];B[br];W[bs];B[bo];W[bn];B[ar];W[ao];B[ap];W[an];B[es];W[ds];B[fs]TR[cm]))(;W[er];B[fr]))(;GM[1]FF[4]SO[bgj 204]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]AB[rr][rq][sq][rp][qp][oq][pp][or]AW[pq][pr][op][np][nq][po][qo][ro][so][sp]C[page 14
journal problem 2

Black to play and live.]GN[28 - problem 2](;B[qs]C[If Black tries to make eye space with this or similar...];W[os]C[...the White plays here and Black's follow up is not sente.];B[qr];W[ss])(;B[os]C[Correct is to add a third sacrifice stone.];W[ps];B[qs];W[nr];B[ss]C[Now Black uses the forcing move to make time to make two eyes.];W[ns];B[qr]))(;GM[1]FF[4]SO[bgj 204]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]C[page 14
journal problem 3

Black to play and live.]AB[ss][qs][qr][pr][or][os][rq]AW[rr][sp][rp][qp][pq][oq][nr][mq]GN[29 - problem 3](;B[sr]C[This does not work.];W[qq]C[White can play here and Black is short of liberties.](;B[rs];W[sq])(;B[sq];W[rs]))(;B[sq]C[This also fails.];W[qq])(;B[qq]C[This is the correct play.];W[sq];B[sr];W[rs]C[White can capture two stones here but Black can play inside and trap the two white stones in a snap-back.];B[sr]))(;GM[1]FF[4]SZ[19]CA[UTF-8]SO[bgj 204]AP[Sabaki:0.52.2]GN[33 - problem 4]AB[np][op][qp][rp][sp][lq][lr][ls][mq][pq][pr][qq]AW[nq][oq][rq][rr][mr][ms][or][os][qr][ps]PM[2]C[page 33
journal problem 4

Black to play and kill in ko.]FG[259:](;B[nr]C[Black must attack this eye first to reduce White's liberties. They cannot live in the corner if they give up this eye.];W[ns](;B[rs]C[Now if Black plays here](;W[sq]C[So White plays here];B[sr]C[Black plays here and White has to start the Ko as connecting fails in damezumari.](;W[ss]C[White has to win this ko to live.])(;W[qs];B[nr]))(;W[qs]C[If White plays here it just dies.];B[sr])(;FG[259:]PM[2];W[sr]C[This dies also.];B[qs]))(;B[sr]C[This also works, but is harder for White to get wrong.];W[sq];B[rs](;W[ss])(;W[qs];B[nr])))(;B[sr]C[This looks like the move to set up a ko.];W[sq];B[rs];W[qs]C[White has enough liberties to play here.];B[nr](;W[ss];B[ns]C[White just has to give up two stones whilst living in the corner.])(;FG[259:]PM[2];W[ns]C[White here leaves all the stones in atari.];B[nr]))(;B[rs]C[Likewise this doesn't kill the corner.](;W[sq](;B[sr];W[qs];B[nr];W[ss])(;B[nr];W[ss];B[sr];W[qs];B[ns]))(;W[qs];B[nr];W[sq])))(;GM[1]FF[4]SZ[19]SO[bgj 204]AP[Sabaki:0.52.2]CA[UTF-8]GN[35 - problem 5]AB[on][pn][qn][rn][no][np][nq][nr][ns][pp][pq][qq][os][ps]AW[po][op][oq][or][rq][pr][qr]C[page 35
journal problem 5

Black to play and kill in ko.](;B[rr]C[Black can try this but fails.](;W[qp];B[qs](;W[sr]C[Playing this way, White lives.];B[rs];W[ro];B[sp];W[so];B[sq];W[pq])(;W[pq]C[White mistake];B[qo];W[ro];B[oo];W[sp]))(;W[rs];B[qp](;W[rp]C[Now whichever option Black chooses White can live.](;B[qo];W[sr](;B[qs];W[sp])(;B[sp];W[qs]))(;B[sr];W[qo];B[qs];W[sq];B[ss];W[rs]))(;W[sr];B[rp];W[qs];B[sp];W[sq])))(;B[qp]C[So it is correct for Black to start here.](;W[qo];B[rr]C[Now Black plays here.](;W[rs];B[rp];W[sr];B[so]C[This is key play that sets up the ko shape.];W[qs];B[sq]C[After this White must take this stone and fight the ko.])(;W[rp];B[qs]C[White is unconditionally dead.]))(;W[rp];B[qo]C[This way White doesn't have room to make two eyes in the corner.])))