(;GM[1]FF[4]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]AB[rr][sq][rp][qp][pp][oq]AW[nr][nq][np][oo][po][qo][ro][qq][rq][qr]C[page 1 
problem 1

Black to play and live]GN[1 problem 1]SO[bgj 202])(;FF[4]ST[0]GM[1]SZ[19]AP[Sabaki:0.52.2]CA[UTF-8]KM[7.5]GN[6 game review]OT[45 seconds Fischer]FG[259:]RU[AGA (Territory)]PW[Bruno Poltronieri]PM[2]PC[London Go Centre]RE[B+3.5]RO[2]DT[2022-08-21]EV[British Championship 2022]PB[Gaoge Wang]TM[6000.0]GC[review by Artem Kachanovskyi]C[page 6
review by Artem Kachanovskyi]AN[Artem Kachanovskyi]SO[bgj 202];B[pd]C[The first game, reviewed in edition 201 of BGJ, was a close and intense battle, which ended up with Gaoge winning by 2.5 points. Below you will find commentary on the second game of the series.];W[dp];B[pq];W[dd];B[nc];W[qo];B[op];W[ql];B[fq];W[iq];B[cq];W[dq];B[cp];W[do];B[dr];W[er];B[cr](;W[eq];B[cn];W[lq];B[qp](;W[qf];B[ro];W[qd];B[qc];W[rc];B[qe];W[rd];B[pf];W[re];B[pe];W[qg];B[fc];C[Bruno played the same move as on the lower side - perhaps, one of his favorite josekis.]W[ic](;B[kc];LB[cf:A]C[A little slow move. It would be more natural for White to play at A.]W[ie];B[fr];W[fs](;LB[cf:A]C[This attachment is normally played when White has a stone at A.]B[dc];W[cc];B[cb];W[ec];B[db];W[ed];B[eb];W[bd];B[fd];W[fe];B[hd](;W[he];B[id](;W[jd];B[ge];W[gf];B[gd];W[je];B[ff];W[ee];B[gg];W[hf];C[A good result for Black - they gained around 15 points on the upper side while White still has to settle their group in the center of the board, separated by Black 57 and 59.]B[jc](;W[dg];B[fg];W[ih];B[ce];W[cd];B[dh];W[ch];C[Black 65 - 69 is a creative and strong combination, sealing White in on the left side.]B[cg];W[df];B[ci];W[bh];B[bi];W[eh];B[di];W[bg];C[The overall result of the struggle in the upper left is favorable for Black: they made points on the upper and left sides, while the white group in the center of the board remains vulnerable.]B[fi];W[dn];B[cm];W[hn];C[Since Black has no weakness around, they can afford to play a move like this, reducing White's moyo on the lower side.]B[fn];W[el];B[gs];W[es];B[gm];W[ej];B[ei];W[gk];B[hm];W[in];B[dm];W[em];B[en];W[fp];B[ik];W[hj];B[ij];W[hi];B[bf];W[cf];C[White attacked Black as severely as they could, but Black managed to keep the situation under control. White ended up with a weak group in the center, too.]B[im];W[gh];B[fh];W[ld];B[lc];W[ki];B[jn](;W[jo];B[kn];W[io]C[You might understand  this move from the analysis elsewhere.];B[gp];W[fo];B[hg];W[ig];B[ii];W[hh];C[A little passive move. Black's central group is strong enough, a more active alternative would be an invasion at A on the right side, separating the triangled white stone.]TR[ql]LB[qj:A]B[ko];W[pi];B[lr](;W[kr];C[Since this move, Black is slightly ahead in the game and White doesn't have where to catch up.]B[mr];W[kp];B[go];W[gn];B[eo];W[ep];B[fm];W[gq];B[lf];W[dk];B[ck];W[le];B[mf];W[kg];B[lh];W[kh];B[lp];W[kq];B[lk];W[mh];B[mq];W[lo];B[mp];W[ml];B[ll];W[mn];B[mm];W[nm];B[lm];W[qn];B[rn];W[rm];B[pm];W[qm];B[om];W[nl];B[on];W[nn];B[mj];W[nj];B[mi];W[lg];B[ni];W[oj];B[mg];W[jf];B[ag];W[ah];B[ai];W[af];B[qb];W[rb];B[bb];W[qa];B[ob];W[oo];B[po];W[no];B[pn];W[nh];B[oh];W[ng];B[nf];W[og];B[pg];W[li];B[of];W[lh];B[hk];W[fj];B[ph];W[qh];B[co];W[gr];B[oi];W[ol];B[pj];W[qi];B[pl];W[pk];B[pp];W[sn];B[rp];W[qj];B[gi];W[gj];B[md];W[ds];B[cs];W[dl];B[cl];W[dj];B[eg];W[cj];B[bj];W[me];B[ne];W[np];B[nq];W[mk];B[lj];W[kj];B[kk];W[oa];B[na];W[pa];B[pb];W[ra];B[ac];W[ad];B[so];W[sm];B[ji];W[jh];B[jj];W[gl];B[hl];W[bc];B[ab];W[kd];B[ln];W[mb];B[mc];W[nb];B[lb];W[ma];B[la];W[na];B[mo];W[ls];B[ms];W[ks];B[fl];W[fk];B[kf];W[ef];B[ke]C[Similarly to the first game of the series, Gaoge was ahead since the early stage and managed to keep a small lead. This time, however, she seemed to control the game better, giving less chances to Bruno.

Congratulations to Gaoge for the British Championship!])(;FG[259:]VW[ai][bi][ci][di][ei][fi][gi][hi][ii][ji][ki][li][mi][ni][oi][pi][qi][ri][si][aj][bj][cj][dj][ej][fj][gj][hj][ij][jj][kj][lj][mj][nj][oj][pj][qj][rj][sj][ak][bk][ck][dk][ek][fk][gk][hk][ik][jk][kk][lk][mk][nk][ok][pk][qk][rk][sk][al][bl][cl][dl][el][fl][gl][hl][il][jl][kl][ll][ml][nl][ol][pl][ql][rl][sl][am][bm][cm][dm][em][fm][gm][hm][im][jm][km][lm][mm][nm][om][pm][qm][rm][sm][an][bn][cn][dn][en][fn][gn][hn][in][jn][kn][ln][mn][nn][on][pn][qn][rn][sn][ao][bo][co][do][eo][fo][go][ho][io][jo][ko][lo][mo][no][oo][po][qo][ro][so][ap][bp][cp][dp][ep][fp][gp][hp][ip][jp][kp][lp][mp][np][op][pp][qp][rp][sp][aq][bq][cq][dq][eq][fq][gq][hq][iq][jq][kq][lq][mq][nq][oq][pq][qq][rq][sq][ar][br][cr][dr][er][fr][gr][hr][ir][jr][kr][lr][mr][nr][or][pr][qr][rr][sr][as][bs][cs][ds][es][fs][gs][hs][is][js][ks][ls][ms][ns][os][ps][qs][rs][ss]PM[2]MN[1];C[Black 119 in the game was the last complicated moment of this game. Once again, the aji on the lower side doesn't let White play agressively, as shown in this diagram.]W[mr];B[go];W[gn];B[eo];W[ep];B[fm];W[gq];B[jp];W[ip];B[kr];W[kq];B[mq];W[nr];B[jq];W[jr];C[After the preparation (Black 2 - 8), Black 10 breaks White's shape on the lower side.]B[kp]))(;FG[259:]VW[ai][bi][ci][di][ei][fi][gi][hi][ii][ji][ki][li][mi][ni][oi][pi][qi][ri][si][aj][bj][cj][dj][ej][fj][gj][hj][ij][jj][kj][lj][mj][nj][oj][pj][qj][rj][sj][ak][bk][ck][dk][ek][fk][gk][hk][ik][jk][kk][lk][mk][nk][ok][pk][qk][rk][sk][al][bl][cl][dl][el][fl][gl][hl][il][jl][kl][ll][ml][nl][ol][pl][ql][rl][sl][am][bm][cm][dm][em][fm][gm][hm][im][jm][km][lm][mm][nm][om][pm][qm][rm][sm][an][bn][cn][dn][en][fn][gn][hn][in][jn][kn][ln][mn][nn][on][pn][qn][rn][sn][ao][bo][co][do][eo][fo][go][ho][io][jo][ko][lo][mo][no][oo][po][qo][ro][so][ap][bp][cp][dp][ep][fp][gp][hp][ip][jp][kp][lp][mp][np][op][pp][qp][rp][sp][aq][bq][cq][dq][eq][fq][gq][hq][iq][jq][kq][lq][mq][nq][oq][pq][qq][rq][sq][ar][br][cr][dr][er][fr][gr][hr][ir][jr][kr][lr][mr][nr][or][pr][qr][rr][sr][as][bs][cs][ds][es][fs][gs][hs][is][js][ks][ls][ms][ns][os][ps][qs][rs][ss]PM[2]MN[1];C[It's tempting to cut off Black's stone, especially that White is slightly behind in the game, but White's position on the lower side is too thin. This is a complicated moment, but let's try to figure out what happens if White plays here.]W[jm];FG[259:]VW[ai][bi][ci][di][ei][fi][gi][hi][ii][ji][ki][li][mi][ni][oi][pi][qi][ri][si][aj][bj][cj][dj][ej][fj][gj][hj][ij][jj][kj][lj][mj][nj][oj][pj][qj][rj][sj][ak][bk][ck][dk][ek][fk][gk][hk][ik][jk][kk][lk][mk][nk][ok][pk][qk][rk][sk][al][bl][cl][dl][el][fl][gl][hl][il][jl][kl][ll][ml][nl][ol][pl][ql][rl][sl][am][bm][cm][dm][em][fm][gm][hm][im][jm][km][lm][mm][nm][om][pm][qm][rm][sm][an][bn][cn][dn][en][fn][gn][hn][in][jn][kn][ln][mn][nn][on][pn][qn][rn][sn][ao][bo][co][do][eo][fo][go][ho][io][jo][ko][lo][mo][no][oo][po][qo][ro][so][ap][bp][cp][dp][ep][fp][gp][hp][ip][jp][kp][lp][mp][np][op][pp][qp][rp][sp][aq][bq][cq][dq][eq][fq][gq][hq][iq][jq][kq][lq][mq][nq][oq][pq][qq][rq][sq][ar][br][cr][dr][er][fr][gr][hr][ir][jr][kr][lr][mr][nr][or][pr][qr][rr][sr][as][bs][cs][ds][es][fs][gs][hs][is][js][ks][ls][ms][ns][os][ps][qs][rs][ss]PM[2]MN[1];B[gp](;W[gq];B[gr](;W[hq];B[ep];W[eo];LB[hk:A][kn:B]C[White carries too big responsibility in this ko fight. Meanwhile, Black has numerous local ko threats, for example A and B.]B[fo])(;FG[259:]VW[ai][bi][ci][di][ei][fi][gi][hi][ii][ji][ki][li][mi][ni][oi][pi][qi][ri][si][aj][bj][cj][dj][ej][fj][gj][hj][ij][jj][kj][lj][mj][nj][oj][pj][qj][rj][sj][ak][bk][ck][dk][ek][fk][gk][hk][ik][jk][kk][lk][mk][nk][ok][pk][qk][rk][sk][al][bl][cl][dl][el][fl][gl][hl][il][jl][kl][ll][ml][nl][ol][pl][ql][rl][sl][am][bm][cm][dm][em][fm][gm][hm][im][jm][km][lm][mm][nm][om][pm][qm][rm][sm][an][bn][cn][dn][en][fn][gn][hn][in][jn][kn][ln][mn][nn][on][pn][qn][rn][sn][ao][bo][co][do][eo][fo][go][ho][io][jo][ko][lo][mo][no][oo][po][qo][ro][so][ap][bp][cp][dp][ep][fp][gp][hp][ip][jp][kp][lp][mp][np][op][pp][qp][rp][sp][aq][bq][cq][dq][eq][fq][gq][hq][iq][jq][kq][lq][mq][nq][oq][pq][qq][rq][sq][ar][br][cr][dr][er][fr][gr][hr][ir][jr][kr][lr][mr][nr][or][pr][qr][rr][sr][as][bs][cs][ds][es][fs][gs][hs][is][js][ks][ls][ms][ns][os][ps][qs][rs][ss]PM[2]MN[1];W[go];B[hq];W[fo];C[If White tries to resist this way, their position on the lower side falls apart.]B[ip]))(;FG[259:]VW[ai][bi][ci][di][ei][fi][gi][hi][ii][ji][ki][li][mi][ni][oi][pi][qi][ri][si][aj][bj][cj][dj][ej][fj][gj][hj][ij][jj][kj][lj][mj][nj][oj][pj][qj][rj][sj][ak][bk][ck][dk][ek][fk][gk][hk][ik][jk][kk][lk][mk][nk][ok][pk][qk][rk][sk][al][bl][cl][dl][el][fl][gl][hl][il][jl][kl][ll][ml][nl][ol][pl][ql][rl][sl][am][bm][cm][dm][em][fm][gm][hm][im][jm][km][lm][mm][nm][om][pm][qm][rm][sm][an][bn][cn][dn][en][fn][gn][hn][in][jn][kn][ln][mn][nn][on][pn][qn][rn][sn][ao][bo][co][do][eo][fo][go][ho][io][jo][ko][lo][mo][no][oo][po][qo][ro][so][ap][bp][cp][dp][ep][fp][gp][hp][ip][jp][kp][lp][mp][np][op][pp][qp][rp][sp][aq][bq][cq][dq][eq][fq][gq][hq][iq][jq][kq][lq][mq][nq][oq][pq][qq][rq][sq][ar][br][cr][dr][er][fr][gr][hr][ir][jr][kr][lr][mr][nr][or][pr][qr][rr][sr][as][bs][cs][ds][es][fs][gs][hs][is][js][ks][ls][ms][ns][os][ps][qs][rs][ss]PM[2]MN[1];W[fo];LB[gn:A]B[go]C[White 1 - the same move as White played later in the game - doesn't work now, since White can't cut at A.
])(;FG[259:]VW[ai][bi][ci][di][ei][fi][gi][hi][ii][ji][ki][li][mi][ni][oi][pi][qi][ri][si][aj][bj][cj][dj][ej][fj][gj][hj][ij][jj][kj][lj][mj][nj][oj][pj][qj][rj][sj][ak][bk][ck][dk][ek][fk][gk][hk][ik][jk][kk][lk][mk][nk][ok][pk][qk][rk][sk][al][bl][cl][dl][el][fl][gl][hl][il][jl][kl][ll][ml][nl][ol][pl][ql][rl][sl][am][bm][cm][dm][em][fm][gm][hm][im][jm][km][lm][mm][nm][om][pm][qm][rm][sm][an][bn][cn][dn][en][fn][gn][hn][in][jn][kn][ln][mn][nn][on][pn][qn][rn][sn][ao][bo][co][do][eo][fo][go][ho][io][jo][ko][lo][mo][no][oo][po][qo][ro][so][ap][bp][cp][dp][ep][fp][gp][hp][ip][jp][kp][lp][mp][np][op][pp][qp][rp][sp][aq][bq][cq][dq][eq][fq][gq][hq][iq][jq][kq][lq][mq][nq][oq][pq][qq][rq][sq][ar][br][cr][dr][er][fr][gr][hr][ir][jr][kr][lr][mr][nr][or][pr][qr][rr][sr][as][bs][cs][ds][es][fs][gs][hs][is][js][ks][ls][ms][ns][os][ps][qs][rs][ss]PM[2]MN[1];W[gr];B[kn];W[km];C[If White simply tries to link up with their two stones on the lower side, Black kills the marked cutting stones.]MA[hn][in]B[io])))(;FG[259:]PM[2]MN[1];W[fg];B[dn];W[en];B[em];W[fn];B[ci];W[ef];C[If White captures the cutting black stone, Black can use its aji and extend on the left side. It would be impossible for White to make full use of the thickness they make in the center of the board.]B[dl]))(;FG[259:]PM[2]MN[1];W[ge];B[jd];C[For White it was better to give up a stone on the upper side this way, extending a moyo on the left and lower sides.

It's a pity that there is an aji of a cutting point at A - the triangled move was better to make one space to the right.]TR[bd]LB[ee:A]W[cl]))(;FG[259:]VW[aa][ba][ca][da][ea][fa][ga][ha][ia][ja][ka][la][ma][na][oa][pa][qa][ra][sa][ab][bb][cb][db][eb][fb][gb][hb][ib][jb][kb][lb][mb][nb][ob][pb][qb][rb][sb][ac][bc][cc][dc][ec][fc][gc][hc][ic][jc][kc][lc][mc][nc][oc][pc][qc][rc][sc][ad][bd][cd][dd][ed][fd][gd][hd][id][jd][kd][ld][md][nd][od][pd][qd][rd][sd][ae][be][ce][de][ee][fe][ge][he][ie][je][ke][le][me][ne][oe][pe][qe][re][se][af][bf][cf][df][ef][ff][gf][hf][if][jf][kf][lf][mf][nf][of][pf][qf][rf][sf][ag][bg][cg][dg][eg][fg][gg][hg][ig][jg][kg][lg][mg][ng][og][pg][qg][rg][sg][ah][bh][ch][dh][eh][fh][gh][hh][ih][jh][kh][lh][mh][nh][oh][ph][qh][rh][sh]PM[2]MN[1];W[id];B[ge];W[gf];B[ff];W[ee];B[hf];W[gg];C[Black 49 in the game was a clever move. If White tries to protect from the cutting point, Black breaks through towards the center - bad for White, since the three white stones on the upper side are now under attack.]B[he]))(;FG[259:]VW[aa][ba][ca][da][ea][fa][ga][ha][ia][ja][ka][la][ma][na][oa][pa][qa][ra][sa][ab][bb][cb][db][eb][fb][gb][hb][ib][jb][kb][lb][mb][nb][ob][pb][qb][rb][sb][ac][bc][cc][dc][ec][fc][gc][hc][ic][jc][kc][lc][mc][nc][oc][pc][qc][rc][sc][ad][bd][cd][dd][ed][fd][gd][hd][id][jd][kd][ld][md][nd][od][pd][qd][rd][sd][ae][be][ce][de][ee][fe][ge][he][ie][je][ke][le][me][ne][oe][pe][qe][re][se][af][bf][cf][df][ef][ff][gf][hf][if][jf][kf][lf][mf][nf][of][pf][qf][rf][sf][ag][bg][cg][dg][eg][fg][gg][hg][ig][jg][kg][lg][mg][ng][og][pg][qg][rg][sg][ah][bh][ch][dh][eh][fh][gh][hh][ih][jh][kh][lh][mh][nh][oh][ph][qh][rh][sh]PM[2]MN[1];B[cc];W[dc];B[cd];W[de];B[db];W[eb];B[cb];W[fb];C[With the marked exchange, the san-san invasion looks even better.]TR[ie][kc]B[cf]))(;FG[259:]VW[aa][ba][ca][da][ea][fa][ga][ha][ia][ja][ka][la][ma][na][oa][pa][qa][ra][sa][ab][bb][cb][db][eb][fb][gb][hb][ib][jb][kb][lb][mb][nb][ob][pb][qb][rb][sb][ac][bc][cc][dc][ec][fc][gc][hc][ic][jc][kc][lc][mc][nc][oc][pc][qc][rc][sc][ad][bd][cd][dd][ed][fd][gd][hd][id][jd][kd][ld][md][nd][od][pd][qd][rd][sd][ae][be][ce][de][ee][fe][ge][he][ie][je][ke][le][me][ne][oe][pe][qe][re][se][af][bf][cf][df][ef][ff][gf][hf][if][jf][kf][lf][mf][nf][of][pf][qf][rf][sf][ag][bg][cg][dg][eg][fg][gg][hg][ig][jg][kg][lg][mg][ng][og][pg][qg][rg][sg][ah][bh][ch][dh][eh][fh][gh][hh][ih][jh][kh][lh][mh][nh][oh][ph][qh][rh][sh]PM[2]MN[1];B[cc];W[dc];B[cd];W[de];B[db];W[eb];B[cb];W[fb];B[cf];LB[qb:A]C[With Black 35 in the game Gaoge most probably wanted to avoid this follow-up. However, even though Black is now forced to play A in order to protect their group, this is a playable position for both sides.]W[lc]))(;FG[259:]VW[jj][kj][lj][mj][nj][oj][pj][qj][rj][sj][jk][kk][lk][mk][nk][ok][pk][qk][rk][sk][jl][kl][ll][ml][nl][ol][pl][ql][rl][sl][jm][km][lm][mm][nm][om][pm][qm][rm][sm][jn][kn][ln][mn][nn][on][pn][qn][rn][sn][jo][ko][lo][mo][no][oo][po][qo][ro][so][jp][kp][lp][mp][np][op][pp][qp][rp][sp][jq][kq][lq][mq][nq][oq][pq][qq][rq][sq][jr][kr][lr][mr][nr][or][pr][qr][rr][sr][js][ks][ls][ms][ns][os][ps][qs][rs][ss]PM[2]MN[1];LB[or:A]C[Despite looking slow, this move is playable - it strengthens White's group and prepares to attack Black's corner, for example at A.]W[po]))(;FG[259:]VW[al][bl][cl][dl][el][fl][gl][hl][il][jl][kl][am][bm][cm][dm][em][fm][gm][hm][im][jm][km][an][bn][cn][dn][en][fn][gn][hn][in][jn][kn][ao][bo][co][do][eo][fo][go][ho][io][jo][ko][ap][bp][cp][dp][ep][fp][gp][hp][ip][jp][kp][aq][bq][cq][dq][eq][fq][gq][hq][iq][jq][kq][ar][br][cr][dr][er][fr][gr][hr][ir][jr][kr][as][bs][cs][ds][es][fs][gs][hs][is][js][ks]PM[2]MN[1];C[The AI prefers this extension over White 18 in the game. You will barely see the move from the game in modern professional games, although it used to be a popular joseki in the pre-AI era.]W[fr];B[cn]))(;GM[1]FF[4]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]AW[rs][qr][qq][ps][or][oq][mq][mp][mo][no][on][om][pm][qn][rm][sm][sp]AB[rr][rq][qp][ro][rn][np][op][pp][pq][pr][po][pn]C[page 12
problem 2

Black play and live]GN[12 problem 2]SO[bgj 202])(;GM[1]FF[4]SZ[19]AP[Sabaki:0.52.2]CA[UTF-8]GN[14 tsumego advice problem 1]DT[2020-11-24]RU[Simple]AB[bp:fp][bq][fq][hq][gr]AW[cq:eq][br][fr:fs]AE[da:dh][qa:qb][bb:cb][sb][ec][pc:pe][rc][be:bf][bh:ch][cl][el][rl:rn][bo:co][qo:qq][so][sq][cr:dr][rs]PL[B]C[page 14
Richard Hunter - advice for doing tsumego part nine

solution to the problem that was introduced in BGJ 201]SO[bgj 202]AN[Richard Hunter](;B[bs](;W[ar](;B[ds];W[dr];B[gs](;W[er];B[cr];W[cs])(;W[cs]C[ERROR 1 in Go Review 1970-03];B[cr]))(;B[cr];W[dr];B[ds];W[cs]))(;W[cs](;B[ar];W[as];B[dr];W[er];B[bs];W[jj];B[jk];W[as];B[kk];W[aq])(;B[dr]C[ERROR 2 in Go Review 1970-03. This is the final move in the diagram. Text says it kills.](;W[er](;B[ar](;W[as](;B[aq];W[ds])(;B[ds];W[aq];B[ap];W[ar]))(;W[ds];B[cr];W[br];B[cr]))(;B[ds];W[as];B[aq];W[ar]))(;W[ar];B[er];W[cr];B[gs]))(;B[ds];W[dr];B[cr];W[kk];B[kl];W[cs];B[ll];W[as]))(;W[dr](;B[ar];W[cs];B[cr])(;B[cs](;W[ar];B[ds])(;W[ds];B[ar];W[cr];B[jl];W[as];B[bs]))))(;B[ds];W[dr](;B[bs](;W[es];B[ar];W[cr])(;W[ar]C[ERROR 3 in Go Review 1970-03];B[cr]))(;B[cs](;W[cr](;B[gs];W[bs](;B[ar];W[es])(;B[es];W[er];B[ds];W[ar]))(;B[es](;W[ar];B[gs];W[er];B[bs];W[as])(;W[bs];B[ar]))(;B[bs](;W[es])(;W[ar];B[gs];W[er]))(;B[ar];W[es]))(;W[bs]C[ERROR in BGJ159](;B[es](;W[ar];B[gs])(;W[er];B[ar];W[cr];B[ds]))(;B[gs];W[cr]))))(;B[ar];W[bs]))(;GM[1]FF[4]SZ[19]AP[Sabaki:0.52.2]CA[UTF-8]GN[16 tsumego advice problem 2]RU[Japanese]ST[2]AB[rn:sn][qo:qq][rr]AW[qm:qn][rm][po:pr][sp][qr]C[page 16
Richard Hunter - advice for doing tsumego part nine

Presumably white has just played inside black's group, so black has to be careful.

Note that diagram 7 shown on page 43 is not the solution.]SO[bgj 202]AN[Richard Hunter](;B[sq]C[If black plays here white cuts with black short of liberties.];W[ro])(;B[rp]C[Playing here is the correct move.](;W[sq]C[If white plays here...](;B[sr]C[...black could block.

](;W[sm]C[When white threatens a snap-back...];B[rq]C[...black here stops it and black is alive](;W[rs];B[so]C[This is the sequence shown in diagram 7 on p43.
However white can play differently.])(;W[so];B[ro](;W[sp];B[rs])(;W[rs];B[sp])))(;W[so]C[However white can play here, which refutes the previous
black move as being correct.](;B[rq]C[If black connects...];W[rs]C[...white takes away the corner eye and black is dead.])(;B[rs]C[If black makes the corner eye...];W[sm]C[... white plays here and black is short of liberties.])))(;B[so];W[sm]C[Black is short of liberties.])(;B[rq]C[This is the correct response for black. 
White cannot kill now.](;W[sm];B[sr];W[so];B[ro](;W[sp];B[rs])(;W[rs];B[sp]))(;W[rs];B[so](;W[sm];B[sr])(;W[sr];B[ss];W[sr];B[sq]))(;W[sr];B[rs];W[sm];B[ss])(;W[so];B[rs];W[sm];B[ro])))(;W[sr]C[If white plays here, black can still get it wrong.](;B[so]C[This is the correct response.];W[rs];B[rq];W[sm];B[sq])(;B[rq]C[This is wrong](;W[rs]C[White will not revert to the previous shape with this.])(;W[sm]C[He will threaten the snap-back again];B[sq](;W[rs]C[White will not play here next...])(;W[so]C[But white will do this.];B[ro];W[rs]C[And kill black.]))))))(;GM[1]FF[4]SZ[19]AP[Sabaki:0.52.2]CA[UTF-8]GN[20 tsumego advice problem 3]DT[2020-11-24]RU[Simple]AB[fo][bp:dp][bq][fq:gq][gr]AW[cq:eq][br][fr:fs]AE[da:dh][qa:qb][bb:cb][sb][ec][pc:pe][rc][be:bf][bh:ch][cl][el][rl:rn][bo:co][qo:qq][so][sq][cr:dr][rs]C[page 20
Richard Hunter - advice for doing tsumego part nine

Black to play and kill]GC[problem 3]SO[bgj 202]AN[Richard Hunter](;B[bs](;W[ar](;B[ds];W[dr];B[gs];W[er];B[cr])(;B[cr];W[dr];B[ds];W[es]))(;W[cs];B[ar];W[as];B[jj]))(;B[ds](;W[dr](;B[cs];W[cr])(;B[bs];W[es];B[ar];W[cr]))(;W[cs];B[dr];W[ar];B[cr])))(;GM[1]FF[4]SZ[19]AP[Sabaki:0.52.2]CA[UTF-8]GN[20 tsumego advice part 10]DT[2020-11-24]RU[Simple]AB[co:cq][bp]AW[bn:dn][bo][do:dq][fq]AE[da:dh][qa:qb][bb:cb][sb][ec][pc:pe][rc][be:bf][bh:ch][cl][el][rl:rn][qo:qq][so][eq][sq][br:cr][fr:fs][rs]PL[B]GC[problem introduced for the next article]C[page 20
Richard Hunter - advice for doing tsumego part nine

This is a variation on Problem 1 in Part Eight in BGJ 201 that I will discuss in the next part.]AN[Richard Hunter]SO[bgj 202])(;GM[1]FF[4]CA[UTF-8]AP[Sabaki:0.52.2]ST[2]RU[Japanese]SZ[19]KM[5.5]GN[23 commemorating Hans Pietsch]PW[Hans Pietsch 4d]PB[Matthew Macfadyen 6d]DT[December 1987]C[page 23
Transcribed from Bremen Go magazine Windmühleki.

Editorial comment: This is a masterpiece by Hans, a victory against the current European champion. Hans plays rather risky and almost fell victim to Matthew’s karami (splitting attack) but his weak groups on the upper and right sides survive like a miracle.

Comments by Hans Pietsch, translated by Jochen Fassbender.]RE[W+Resign]FG[259:]PM[2]SO[bgj 202];B[pd];W[dc];B[dp];W[pp];B[de];W[fd];B[hc];W[ce];B[cf];W[be];B[dd];W[cc];B[eg];W[fb]C[Lukewarm, better at 50.];B[cn];W[jq];B[qn];W[pn];B[pm];W[on];B[qo];W[qp];B[qj];W[nc]C[The regular defence in the corner (White 30) would probably be better.];B[rp];W[rq];B[po];W[op]C[Should not evade the fight by playing at 29.];B[oo];W[np];B[oe];W[kd]C[(This) is lukewarm too. The invasion in the corner is better.];B[he];W[fq]C[Second tenuki. 35 is too good for Black.];B[ob];W[kg];B[ig];W[dj]C[38/40 (are) classic handicap style.];B[mg];W[pi];B[pj];W[ni];B[kh];W[nf];B[oh];W[oi];B[pg];W[id];B[gc];W[fc];B[ic];W[ie];B[ge];W[lh];B[lg];W[jh];B[ki]C[Atari from above taking profit would be completely sufficient.];W[jg];B[le];W[ih];B[hg];W[ke];B[fj];W[li];B[lj];W[mi];B[me];W[kj];B[ji];W[kk];B[ij];W[lk];B[il]LB[hj:A]C[Lukewarm; better more tightly at A.];W[jc];B[lc];W[ld];B[mc];W[md];B[nb];W[ne];B[nh];W[gi];B[fi];W[hk];B[ik];W[gg];B[hh];W[ii];B[jj];W[hi];B[gh];W[gk];B[hm];W[fk];B[km];W[mm];B[mn];W[lm];B[ln];W[kn];B[jm];W[ko];B[nm];W[nl];B[fm];W[gn];B[gm];W[dl];B[mp];W[lp];B[hq]C[A careless overplay; should connect at 140.];W[en];B[fn];W[eo];B[go];W[dq];B[cq];W[ep];B[nk];W[ol];B[ok];W[mk];B[om]C[Should throw in at 125.];W[qi]C[Should connect at 125 in sente.];B[ml];W[ll];B[qg];W[rj];B[rk];W[rh];B[in];W[rg];B[rf];W[sk];B[rl]C[135, 141. Last chance for Black to turn the tide.];W[ng];B[mh];W[sg];B[em];W[dm];B[dn];W[do];B[co];W[cp];B[bp];W[bq];B[bl];W[ck];B[bk];W[bj];B[ci];W[cj];B[cr];W[dp];B[ao];W[bn];B[bm];W[br];B[ar];W[dr];B[aq];W[cs];B[ak]C[Blunder, better at 167.];W[kb];B[ib];W[ch];B[bi];W[di];B[bh];W[dh];B[bg];W[ej];B[el];W[ek];B[cl];W[df];B[dg];W[cg];B[bf];W[ef]C[Black is unable to capture the two white stones.])(;GM[1]FF[4]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]AB[rs][rr][qq][pp][rp][oo][no][mo][mp][lo][ko][jo][ip][iq][hr][is][jr][ks][lq]AW[lp][kp][kr][lr][mq][mr][ms][op][oq][pr][qr]C[page 26
problem 3

Black to play and kill]GN[26 problem 3]SO[bgj 202])(;SZ[19]FF[3]PW[Go Seigen]WR[9d]PB[Suzuki Etsuo]BR[7d]RO[Game 6]DT[1956-11-13,14]PC[Atami Spa, Shizuoka Pref.]TM[10h]OH[-B-]RE[B+8]GN[32 book review]AP[Sabaki:0.52.2]CA[UTF-8]C[page 32
minimal comments; go with the flow by Yoda Norimoto]SO[bgj 202];B[pe];W[qp];B[do];W[cd];B[po];W[pp];B[oo];W[qo];B[op];W[oq];B[nq];W[pn];B[on];W[pm];B[om];W[pl];B[ol];W[pk];B[ok];W[oj];B[nj];W[ni];B[mj];W[oi];B[pc];W[eq];B[gq];W[cq];B[go];W[or];B[cp];W[dp];B[co];W[bq];B[er];W[fr];B[dr];W[fq];B[dq];W[ep];B[gr];W[gs];B[hs];W[fs];B[ir];W[eo];B[en];W[cr];B[nr];W[ik];B[fj];W[ii];B[hj];W[ij];B[gg];W[jm];B[fo];W[ds];B[ig];W[em];B[fm];W[dn];B[fn];W[kh];B[kg];W[lg];B[jh];W[ki];B[lf];W[kf];B[jg];W[lh];B[ji];W[kj];B[kl];W[kk];B[mf];W[hc];B[dm];W[kc];B[cf];W[ed];B[ef];W[kn];B[ml];W[io];B[qg];W[mp];B[np];W[hf];B[hg];W[pg];B[qi];W[ph];B[qf];W[pb];B[ob];W[oc];B[od];W[nc];B[qb];W[nb];B[pa];W[bf];B[be];W[ce];B[bg];W[df];B[cg];W[dg];B[dh];W[eg];B[eh];W[fg];B[fh];W[bd];B[gf];W[qj];B[gc];W[gd];B[hd];W[id];B[fd];W[he];B[ge];W[fc];B[hd];W[cn];B[ic];W[gd];B[fp];W[es];B[hd];W[hb];B[cm];W[gd];B[jl];W[il];B[hd];W[bn];B[bm];W[gd];B[hm];W[im];B[hd];W[nd];B[gd];W[oe];B[ke];W[pd];B[qd];W[pf];B[qe];W[bo];B[rj];W[gb];B[fb];W[ec];B[ib];W[eb];B[jd];W[rk];B[af];W[am];B[al];W[an];B[bl];W[ri];B[os];W[pr];B[ps];W[qs];B[ns];W[qr];B[qh];W[kq];B[jq];W[jp];B[kr];W[iq];B[jr];W[ff];B[ng];W[nf];B[mg];W[nh];B[ad];W[bc];B[me];W[jc];B[ha];W[fa];B[lc];W[lb];B[mc];W[md];B[ld];W[mb];B[jb];W[kb];B[ne];W[of];B[od];W[kd];B[ie];W[pd];B[ee];W[de];B[od];W[le];B[ld];W[pd];B[bp];W[ap];B[od];W[ja];B[pi];W[pj];B[rh];W[ga];B[si];W[sk];B[id];W[ia];B[oh];W[pd];B[jj];W[jk];B[od];W[je];B[og];W[le];B[hi];W[ke];B[ac];W[ab];B[ae];W[lp];B[mq];W[lq];B[lr];W[bb];B[hn];W[mn];B[lm];W[hq];B[hp];W[ip];B[hr];W[ln];B[mo];W[lo];B[fe];W[hl];B[gl];W[jf];B[if];W[lk];B[mm];W[mk];B[nk];W[nm];B[nl];W[nn];B[in];W[sj];B[ri];W[hk];B[gk];W[no];B[jn];W[km];B[ll];W[jo];B[ih];W[na];B[ho];W[oa];B[pb])(;GM[1]FF[4]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]AW[rr][rq][qo][pn][no][mo][mq][lq][oq][or]AB[op][pp][pq][pr][lr][kr][kq][kp][lo]C[page 37
problem 4

Black to play and escape.]GN[37 problem 4]SO[bgj 202])(;GM[1]FF[4]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]AB[np][nq][nr][ns][os][oo][po][qo][ro][sp]AW[or][oq][op][pp][ps][qr][sr]C[page 41
problem 5

Black to play and kill.]GN[41 problem 5]SO[bgj 202])(;GM[1]FF[4]SZ[19]AP[Sabaki:0.52.2]CA[UTF-8]GN[42 problem 1 solution]AB[pp][qp][rp][oq][sq][rr]AW[oo][po][qo][ro][np][nq][nr][qq][qr][rq]C[page 42
problem 1 solution

Black to play and live]SO[bgj 202](;B[or]C[This looks like the largest eye
space but Black loses all his eyes in the corner.](;W[qs](;B[sr];W[os])(;B[ps];W[sr];B[ss];W[rs])(;B[ns];W[sr];B[mr];W[lq]))(;W[ps]C[This ends in ko.];B[os];W[sr];B[ss];W[rs]))(;B[pr]C[Filling a liberty might also be possible.];W[rs];B[sr];W[ps];B[os];W[or];B[qs]C[However it is also Ko.])(;B[ps]C[This is the correct play that avoids Ko. White cannot create a living  shape.](;W[sr];B[ss];W[qs];B[pr])(;W[or];B[pr])(;W[pr];B[or];W[qs];B[os];W[sr];B[ss])))(;GM[1]FF[4]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]AW[rs][qr][qq][ps][or][oq][mq][mp][mo][no][on][om][pm][qn][rm][sm][sp]AB[rr][rq][qp][ro][rn][np][op][pp][pq][pr][po][pn]C[page 42
problem 2 solution

Black play and live]GN[42 problem 2 solution]GC[original problem page 12]DT[2023-02-17]SO[bgj 202](;B[sr]C[Black can try to take the 1-1 point by playing here first.];W[rp];B[qs];W[qr];B[qq];W[qs];B[ss];W[mr];B[os];W[qs];B[ps];W[sn]C[Black can only make one eye.])(;B[sq]C[This is the correct first play.];W[nq]C[White protects the weakness.];B[ss]L[os]C[But Black can start the Ko (White ends the Ko by connecting on the 5-1 point at A, not at 1-1 of course).]))(;GM[1]FF[4]SZ[19]AP[Sabaki:0.52.2]CA[UTF-8]GN[43 problem 3 solution]AB[jo][ko][lo][mo][no][oo][ip][iq][mp][pp][rp][lq][qq][hr][jr][rr][rs][is][ks]AW[kp][lp][op][oq][mq][mr][ms][kr][lr][pr][qr]C[page 43
problem 3 solution

Black to play and kill]GC[original problem page 26]DT[2023-02-17]SO[bgj 202](;B[or]C[This is the correct first play.](;W[os];B[nr];W[nq];B[pq](;W[ns];B[or]C[After this throw-in White cannot make two eyes];W[ps];B[kq]C[Note this is not an eye for White now.];W[jq];B[kq])(;W[kq](;B[ps];W[ns];B[or])(;B[qs]C[Black mistake.];W[ns])))(;W[nr]C[If White tries this atari instead.];B[os];W[ps];B[pq];W[ns];B[or]C[Then again the throw-in here stops two eyes.]))(;B[nr]C[This is wrong.](;W[or]C[White can make two eyes.])(;W[os]C[White mistake.];B[or]C[Reverts to the correct line.])))(;GM[1]FF[4]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]AW[rr][rq][qo][pn][no][mo][mq][lq][oq][or]AB[op][pp][pq][pr][lr][kr][kq][kp][lo]C[page 44
problem 4 solution

Black to play and escape.]GN[44 problem 4 solution]GC[original problem page 37]SO[bgj 202](;B[nq]C[This wedge seems the obvious first play.];W[mr];B[nr];W[ms];B[mp];W[np]C[However this is double-atari and Black cannot escape.])(;B[os]C[Playing this hane first is the correct play.](;W[nr]C[If White tries this...];B[mr]C[... then this play means it is miai for Black to connect on the edge or push through above.])(;W[ns]C[This is White's strongest reply.];B[nq];W[nr];B[np];W[mp];B[mr];W[ps];B[ms]C[White runs out of liberties.])))(;GM[1]FF[4]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]AB[np][nq][nr][ns][os][oo][po][qo][ro][sp]AW[or][oq][op][pp][ps][qr][sr]C[page 44
problem 5 solution

Black to play and kill.]GN[44 problem 5 solution]GC[original problem page 41]DT[2023-02-17]SO[bgj 202](;B[rs]C[The looks like the point to stop the eyes of the edge...];W[qq];B[pr];W[qs]C[.. but White leives easily.])(;B[qq]C[This is the play to remove the eye on the left...];W[rs]C[... but White makes the edge eyes.])(;B[pr]C[So the throw-in here is the correct first play.];W[pq];B[rs]C[Then Black attacks the edge eyes.](;W[rq];B[qp]C[This exchange doesn't help.];W[qq];B[qs];W[rr];B[pr]C[Black can start the Ko to kill White.])(;W[qq];B[qs]C[The sequence continues as before.])))