(;GM[1]FF[4]SO[bgj 206]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]AW[rq][sp][qp][pp][pq][pr][or][oq][nr]AB[lq][mr][ns][nq][np][op][po][qo][ro][rp][rn][qq]C[page 3
journal problem 1

Black to play]GN[3 - problem 1];B[rr]C[Correct](;W[sr]C[White's best response is to play here and then fight the ko.];B[sq])(;W[qr]C[Incorrect for White.];B[sr](;W[sq];B[so];W[qq];B[os]C[White is dead.])(;W[rs];B[so]C[White cannot catch the two stones.])))(;GM[1]FF[4]SO[bgj 206]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]C[page 7
journal problem 2

Black to play]AB[ss][sr][sq][sp][rp][qp][qq][pq][oq][or]AW[ns][nr][nq][np][op][pp][po][qo][ro][so][rq][rr][qr]GN[7 - problem 2](;B[rs]C[Correct.];W[os];B[ps]C[The black group is alive in seki.])(;B[os]C[This is wrong.];W[rs]C[White plays here and either it is a dead shape or White gets an eye.](;B[ps];W[qs])(;B[qs];W[ps])))(;GM[1]FF[4]SZ[19]CA[UTF-8]SO[bgj 206][2000-10 パワーをつける詰碁]AP[Sabaki:0.52.2]GN[12 - tsumego advice 13 problem 1]US[Richard Hunter]AB[jb:jc][kb][mb:nb][sb][rc][kd:kf][qd][oe:of][re][lf:nf][qf]AW[la:le][rb][kc][mc][pc:pd][qc][nd:ne]C[page 12
advice for doing tsumego part 13
problem 1

Black to play](;B[od]CH[1](;W[oc](;B[me](;W[nc];B[qb];W[pb];B[ra];W[pa](;B[na])(;B[ma];W[na];B[oa];W[ob])(;B[pe];W[na]))(;W[md];B[nc]))(;B[nc];W[me](;B[ob];W[pb];B[ka];W[oa])(;B[ka];W[ob])))(;W[nc];B[oc];W[ob];B[pb]))(;B[qb];W[pb](;B[ra];W[me](;B[od];W[nc](;B[pa];W[oa];B[ob];W[oc];B[na];W[ma])(;B[ob];W[oc];B[pa];W[oa];B[na];W[ma])(;B[oc];W[ob];B[ka];W[na]))(;B[pa];W[ob](;B[od];W[nc];B[oc];W[na])(;B[oa];W[na];B[ma];W[nc]))(;B[ob];W[pa];B[od];W[oc];B[nc];W[na]))(;B[od](;W[nc](;B[ra];W[me](;B[ob];W[oc];B[pa];W[oa];B[na];W[ma])(;B[oc];W[ob]))(;B[me];W[ra];B[oc];W[ob])(;B[qa];W[me](;B[oc];W[ob])(;B[ob];W[oc];B[pa];W[oa];B[na];W[ma])))(;W[oc];B[me];W[nc];B[ra];W[pa];B[na]))(;B[me](;W[nc](;B[ra];W[od](;B[pa];W[ob];B[oa];W[na])(;B[ob];W[pa];B[na];W[nh];B[oa]))(;B[od];W[ra];B[oc];W[ob]))(;W[qa];B[nc])))(;B[pb](;W[oc](;B[qb];W[ob](;B[me];W[ra])(;B[ra];W[me];B[oa];W[na]))(;B[ob];W[qb];B[nc];W[od];B[me];W[md];B[ra];W[qa];B[pe];W[ma];B[ka];W[pa]))(;W[qb];B[od](;W[oc];B[nc](;W[me];B[ob];W[pa];B[pe])(;W[ob];B[me];W[md];B[ka]))(;W[nc];B[oc]))))(;GM[1]FF[4]SZ[19]CA[UTF-8]SO[bgj 206]AP[Sabaki:0.52.2]GN[15 - tsumego advice 13 problem 2]DT[2020-11-24]KM[-7.5]RU[Simple]AB[lb][nb:nd][sc:sd][od:rd]AW[ob:oc][sb][pc:rc]AE[da:dh][qa:qb][bb:cb][ec][be:bf][pe][bh:ch][cl][el][rl:rn][bo:co][qo:qq][so][cq:eq][sq][br:dr][fr:fs][rs]PL[B]C[page 15
advice for doing tsumego part 13
problem 2

Black to play](;B[ra](;W[rb](;B[qb];W[pa];B[qa];W[pf];B[na];W[oa])(;B[pa];W[oa];B[qb]LB[qa:A][pb:B]))(;W[qb];B[rb];W[qa];B[oa])(;W[pa];B[rb]))(;B[qb];W[rb](;B[ra];W[pa];B[qa];W[pf];B[na];W[oa])(;B[pa];W[ra];B[oa];W[pb]))(;B[rb];W[ra])(;B[pa];W[ra];B[oa];W[qa];B[qb];W[rb]))(;GM[1]FF[4]SZ[19]CA[UTF-8]SO[bgj 206]AP[Sabaki:0.52.2]GN[16 - tsumego advice 13 problem 3]DT[2020-11-24]KM[-7.5]RU[Simple]AB[jb:jd][kb][rb:rd][qc][kd][nd][le][qe:qf][mf:of]AW[ka][ra][lb:lc][qb][kc][mc:me][nc][pc:pd][qd]AE[da:dh][qa][bb:cb][sb][ec][be:bf][pe][bh:ch][cl][el][rl:rn][bo:co][qo:qq][so][cq:eq][sq][br:dr][fr:fs][rs]PL[B]C[page 16
advice for doing tsumego part 13
problem 3

Black to play](;B[ob](;W[pb];B[od];W[oc];B[nb](;W[la](;B[oa];W[qa];B[ma])(;B[qa];W[na](;B[oa];W[pa];B[ma];W[mb])(;B[pa];W[oa])(;B[mb];W[pa])))(;W[qa];B[oa];W[la];B[ma]))(;W[ne];B[pb];W[nb];B[qa](;W[od];B[ma])(;W[na];B[od])))(;B[od];W[oc];B[pb];W[pa])(;B[pb];W[ob];B[qa];W[ne]))(;GM[1]FF[4]SZ[19]CA[UTF-8]SO[bgj 206][1994-06 Kido furoku Hisajima 死活の急所 shikatsu no kyusho]AP[Sabaki:0.52.2]GN[18 - tsumego advice 13 problem 4]US[Richard Hunter]AB[kb:lb][sb][lc:mc][rc:rd][nd:qd]AW[na][mb][pb][rb][nc:oc][qc]C[page 18
advice for doing tsumego part 13
problem 4

Black to play
Problem for part fourteen])(;GM[1]EV[Internet Go Server game: FrenchDude vs Fears]US[Brought to you by IGS PANDANET]CP[
  Copyright (c) PANDANET Inc. 2023
  Permission to reproduce this game is given, provided proper credit is given.
  No warrantee, implied or explicit, is understood.
  Use of this game is an understanding and agreement of this notice.
]GN[19 - how to use thickness]RE[W+Resign]PW[FrenchDude]WR[3d?]NW[31]PB[Fears]BR[2d ]NB[30]PC[IGS:  igs.joyjoy.net 6969]DT[2023-10-25]SZ[19]TM[3600]KM[6.5]LT[]RR[Normal]C[page 8 (problem)
page 19 (solution)

How to use thickness

 Fears 2d : 124 Hi, have a nice game =)
 FrenchDude 3d?: 124 Hi, you too!]SO[bgj 206]AP[Sabaki:0.52.2]CA[UTF-8]CO[Toby Manning]GC[First round of 2023/24 Pandanet Go European Championship];B[pd]BL[3581];W[dp]WL[3592];B[dc]BL[3564];W[pp]WL[3553];B[df]BL[3549];W[nc]WL[3520];B[kd]BL[3479];W[qc]WL[3479];B[pc]BL[3463];W[qd]WL[3459];B[pe]BL[3459];W[pb]WL[3458];B[ob]BL[3454];W[qb]WL[3457];B[nb]BL[3437];W[qf]WL[3295];B[mc]BL[3398];W[ch]WL[3232];B[cp]BL[3041];W[cq]WL[3113];B[co]BL[3035];W[dq]WL[3106];B[ck]BL[2926];W[dd]WL[3021];B[cd]BL[2663];W[ce]WL[2875];B[de]BL[2656];W[ed]WL[2856];B[cc]BL[2635];W[cf]WL[2851];B[dg]BL[2630];W[dh]WL[2838];B[fe]BL[2207];W[bi]WL[2694];B[fd]BL[2124];W[cm]WL[2689];B[bm]BL[1628];W[bn]WL[2627];B[cn]BL[1428];W[bl]WL[2623];B[dm]BL[1426];W[cl]WL[2621];B[dl]BL[1421];W[bk]WL[2534];B[eo]BL[1379];W[gq]WL[2505];B[qq]BL[1336];W[pq]WL[2420];B[qp]BL[1323];W[po]WL[2411];B[rn]BL[1232];W[fn]WL[2394];B[en]BL[1176];W[fm]WL[2333];B[gp]BL[880];W[fp]WL[2299];B[fo]BL[874];W[go]WL[2298];B[hp]BL[871];W[fq]WL[2297];B[io]BL[516];W[hn]WL[2257];B[fk]BL[501];W[in]WL[2199];B[ko]BL[466];W[jo]WL[2156];B[jp]BL[457];W[jn]WL[2154];B[mp]BL[386];W[lo]WL[1548];B[kp]BL[269];W[kn]WL[1544];B[no]BL[251];W[mn]WL[1490];B[nq]BL[521];W[qn]WL[1444];B[qo]BL[506];W[pn]WL[1231];B[rm]BL[403];W[qr]WL[1214];B[rr]BL[389];W[or]WL[1212];B[nr]BL[289];W[rs]WL[1135];B[nn]BL[274];W[nm]WL[1117];B[sr]BL[267];W[om]WL[1044];B[hq]BL[253];W[hr]WL[1004];B[ir]BL[251];W[gs]WL[985];B[ho]BL[225];W[gn]WL[978];B[jq]BL[223];W[gj]WL[702];B[ei]BL[196];W[dj]WL[685];B[ek]BL[91];W[fi]WL[669];B[gk]BL[87];W[hj]WL[655];B[eh]BL[85];W[ej]WL[653];B[fj]BL[80];W[fh]WL[626];B[hk]BL[72];W[ij]WL[619];B[ik]BL[65];W[jj]WL[607];B[jk]BL[63];W[kj]WL[462];B[kk]BL[56];W[lk]WL[457];B[ll]BL[25];W[ml]WL[438];B[lj]BL[19];W[mk]WL[436];B[lm]BL[14];W[kl]WL[400];OS[adavies][baldur][brinchi][EastNorth][esmeralda][Hamahiga][hirosato35][hmm][illegal][KoU][Lomis][Maia][Mercian72][mikann][miroku][mismo][sn2026][turikichi][YuriyB])(;GM[1]FF[4]SO[bgj 206]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]C[page 31
journal problem 3

Black to play]AB[nr][nq][oq][pp][qp][rp][sp][qr]AW[rr][rq][qq][pq][or][os]GN[31 - problem 3](;B[pr]C[This is correct.];W[qs]C[White must reduce black liberties.];B[sr]C[This play kills as White
cannot capture it.];W[sq]C[This is self-atari.])(;B[sr]C[Playing here first does not work.];W[pr];B[qs];W[sq];B[rs]C[White gets an approach-move
ko for Black, who needs to
add a move on the outside.];W[ss];B[pl];W[ql];B[sr];W[pm];B[ns]C[Now it is a direct ko.]))(;CA[UTF-8]ST[2]SO[bgj 206]AP[Sabaki:0.52.2]SZ[19]FF[4]GM[1]WR[5d]EV[British Go Championship]RE[B+6.50]PM[2]BR[4d]DT[2023-08-27]RO[2]PW[Ho Yeung Woo]FG[259:]RU[Japanese]PB[Bruno Poltronieri]GN[ 32 - British championship game 2]KM[6.5]CO[Artem Kachanovskyi];C[This is the second game of the best-of-three final match of the British Championship between Bruno Poltronieri 4d (Black) and Ho Yeung Woo 5d. The previous game was an intense battle and Ho won it by resignation after 147 moves playing Black.]B[pp];W[dd];B[dp];W[pd];B[qc];W[qd];B[pc];W[od];B[nb];W[cn];B[qh];W[fq];B[dn];W[dm];B[en];W[co];B[cp];W[er];B[dr];W[cr](;B[cm];W[cl];B[bm];W[bl];B[em];W[dl];B[ds];W[iq];B[do];W[bn];B[bo];W[am];B[oh](;W[mf]C[ ](;B[qn];W[mc];B[mb];W[kc];B[kq];W[nm]C[Another creative move by Ho Yeung Woo 5d - a probe asking Black which side he prefers to enclose.];B[pl];W[np];B[ko];W[pq];B[qq](;W[oq];C[Black 47 is a little slow. Extension at A would be better.]LB[qr:A]B[qp];W[mq];B[io];W[kr];C[Instead of Black 51 or the previous move it's better to make a big move elsewhere - for example, a san-san invasion in the upper-left corner.]B[lr];W[lq];B[jr];W[kp];B[jq];W[jp];B[ip];W[ir];B[ks];W[jo];B[jn];W[lp];B[mr];W[nr];B[ms];W[dq];B[cq];W[eq];B[br];W[in];B[go];W[gr];B[im];W[kn];B[hn];W[is];B[js];W[fd]C[Black's attack on the lower side ended in gote, he didn't profit much from it and both white groups are safe - White gained a comfortable lead in the game.];B[bd](;W[bf];B[cc];W[db];B[ce];W[cg];B[dg];W[dh];B[df];W[eh];B[ch];W[bh];B[ci];W[bi](;B[fe];W[fg](;B[ec];W[dc];B[cf];W[bg];B[ed];W[ee];B[ff];W[de];B[gd];W[ef];B[eg];W[gg];B[eb];W[cb];B[bb];W[cd];B[be];W[bc];B[ac];W[ae];B[cc];W[ge];B[fc];W[gf];B[fd];W[bc];B[lo];W[ad]C[A catasrophic result for Black. If White also captures the black group on the upper side, Black wouldn't be able to compensate it in the lower right.];B[mo];W[jm];B[in];W[ln];B[no];W[oo];B[on];W[nn];B[op](;W[kj](;B[li];W[hc];B[ki];W[ij];B[ji];W[jj];B[ii];W[mn];B[po];W[jl];C[A desperate but necessary attempt - otherwise, Black is far behind on points.]B[hd](;W[ic];B[id](;W[je];B[jd];W[kd];B[jc];W[jb];B[kb](;W[lb];B[ib];W[ka];C[Black 151 - 155 not only made life on the upper side, but also gained almost ten points of territory there - a big success for Black and a turning point of the game!]B[hb];W[rc];B[rb];W[re];B[sc];W[sd];B[rd];W[gb];B[gc];W[rc];B[hq];W[hr];B[rd];W[qr];B[rr];W[rc];B[mk](;W[ll];B[rd];W[rq];B[pr];W[rc];B[sb];W[oi]C[Another desperate attempt to complicate the sitatuation.];B[ni];W[nj](;B[oj];W[pi];B[pj];W[mi];B[nh];W[mh];B[mj];W[ng];B[lj];W[ph];B[qi];W[og];B[nk];W[qg]C[Even though White gained points here, it's not enough - Black is still ahead.

After a straightforward endgame, Bruno Poltonieri 4d playing Black won by 6.5 points. This game was full of exciting struggle and breathtaking exchanges. Next time we will go together through the third and final game of the series.
];B[hj];W[hk];B[gk];W[ik];B[ek];W[gj];B[fj];W[hi];B[cj];W[el];B[gl];W[dj];B[dk];W[ck];B[di];W[ei];B[ej];W[bj];B[dj];W[rh];B[ri];W[si];B[rg];W[sg];B[sh];W[fl];B[fk];W[rh];B[fs];W[es];B[cs];W[gp];B[hp];W[gs];B[sh];W[gm];B[hl];W[rh];B[rf];W[qf];B[sh];W[ps];B[qs];W[rh];B[sj];W[sf];B[sh];W[fo];B[gn];W[si];B[qj];W[fm];B[fn];W[pa];B[pb];W[ma];B[qa];W[nc];B[ob];W[om];B[pm];W[kg];B[jf];W[kf];B[ie];W[bp];B[bq];W[ao];B[ke];W[le];B[gq];W[fp];B[lh];W[lg];B[ni];W[nh];B[sh];W[or];B[qr];W[si];B[fi];W[ml];B[sh];W[bs];B[as];W[si];B[lk];W[kk];B[sh];W[il];B[hm];W[si];B[aq];W[ol];B[ok];W[sh];B[da];W[ca];B[ea];W[ap];B[ia];W[ja];B[rd];W[rj];B[rk];W[rc];B[na];W[la];B[rd];W[sk];B[sl];W[rc];B[lc];W[ld];B[rd];W[mp];B[nq];W[rc];B[gi];W[rd];B[hj];W[hh];B[je];W[gj];B[nj];W[hj];B[jg];W[ih];B[jh];W[ig];B[hf];W[fr];B[nl];W[hg];B[fh];W[he];B[if];W[gh];B[kh];W[oc];B[eo];W[ep])(;VW[ha:ss]FG[259:]PM[2]MN[1];B[mi];W[pi];B[ph];W[nk];C[The strongest resistance for Black]B[qj]))(;FG[259:]PM[2]MN[1];W[sb](;B[ll];W[gj];B[km];W[rg]C[Black 171 was a careless ko threat: if White accepts this trade, the game becomes close.])(;FG[259:]PM[2]MN[1];B[hj];W[hk];B[gk];W[gj];B[hi];W[hl];B[ll];W[gl];B[fk];W[fl];B[el];W[ek];B[fj];W[gi]C[There is no way for Black to kill the whole white group in the middle. If he plays 7 at 8, White plays 7 and makes two eyes.])))(;VW[aa:si]FG[259:]PM[2]MN[1];W[ib];B[lb];W[gb];B[if](;W[ie];B[he];W[hf];B[ke];W[jf];B[kf];W[jg];C[If White tries to resist as shown in this diagram, Black captures the two cutting stones.]B[md])(;VW[aa:si]FG[259:]PM[2]MN[1];W[jf];B[ig];W[ie];B[he];W[hf];B[ke];W[kf];C[This is a harder resistance, but Black 6 is a severe cut leaving White no chance of success.]B[le])))(;VW[aa:si]FG[259:]PM[2]MN[1];W[jf];B[jd];W[lb];B[if];W[ig];B[jg];W[kf]C[White 146 in the game was a careless move - perhaps, Ho Yeung Woo didn't see Black's follow-up in the game. This diagram shows how White could kill Black in a safe way.]))(;VW[aa:si]FG[259:]PM[2]MN[1];W[id];B[ie];W[jd];B[he];W[jf];B[je];W[kf]C[The easiest way to kill Black.]))(;VW[aa:sj]FG[259:]PM[2]MN[1];B[hc];W[ib];C[Instead of Black 133 in the game, it was better to try to make life on the upper side. After Black 3, White can play A, but this looks risky - the center is still open and White's influence would be erased if Black makes two eyes there.]LB[fa:A]B[gb]))(;FG[259:]PM[2]MN[1];W[hc];B[hd];W[ic]C[White 1 and 3 kills Black on the upper side. A and B are miai and White is ahead on points.]LB[kj:A][li:B]))(;VW[aa:sl]FG[259:]PM[2]MN[1];B[dc];W[ec];B[cf];W[bg];B[ee];W[ed];B[cb];W[eb];C[Black 95 in the game led to a disaster for Black. Bruno still had a chance to escape, making the game close.]B[ge]))(;VW[aa:sl]FG[259:]PM[2]MN[1];B[cf];W[bg];B[dc];W[ec];B[ee];W[ed];B[cb];W[eb];C[Black 93 in the game was an odd shape. In this diagram you can see a simple and clear way for Black to escape, reducing White's potential.]B[gf]))(;FG[259:]PM[2]MN[1];W[cd];B[be];W[bc];B[ch];TR[bn][cn][bl][co][cl][dl][am][dm]W[eh]C[White 80 in the game was a wrong direction of play. Instead of making points on the left side, it was better to enclose the corner and push Black towards a powerful triangled thickness, extending the moyo on the upper side.]))(;VW[jg:ss]FG[259:]PM[2]MN[1];W[qr](;B[oq];W[pr];B[op];W[qp];B[rq];W[rp];B[rr];TR[np][nm]W[rs]C[White 46 in the game was a slow move. It's better to play a hane White 1 - the triangled stones are light and White can exchange them for the corner.])(;VW[jg:ss]FG[259:]PM[2]MN[1];B[pr];W[oq];B[rr];W[qp];B[rq];W[po];B[rp];W[qo];B[ro];W[pn];B[pm];W[om]C[Black 1 here allows White to capture another stone, making two eyes and reducing Black's corner. This result is good for White.])))(;VW[ja:sj]FG[259:]PM[2]MN[1];C[ ]B[mc];W[md];B[ld];W[le];TR[mf]C[The triangled stone helps White make a good shape if Black continues playing here.]B[kd]))(;VW[ja:sj]FG[259:]PM[2]MN[1];W[mc];B[nc];W[nd];B[md];W[lc];TR[oh][qh]C[White 34 in the game is a creative jump. If White plays keima at 1 instead, Black splits White in two and the triangled stones make the following fight favorable for Black.]B[me]))(;VW[aj:js]FG[259:]PM[2]MN[1];B[ep];W[dq]C[Black's sacrifice of 21 and 23 in the game gave White too much influence. It was better to connect as shown in this diagram. If White 2 captures the black stone in the corner, Black can attack on the left side with A and on the lower side with B. Instead of 2, White might prefer to extend at C.]LB[dk:A][hp:B][iq:C]))(;GM[1]FF[4]SO[bgj 206]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]C[page 39
journal problem 4

Black to play]AB[pq][pr][os][nr][ns][nq][np][oo][po][qo][ro][so][nn]AW[rr][qq][qp][rp][sp][pp][op][oq][or]GN[39 - problem 4];B[rs]C[Correct.];W[qs]C[This is White's strongest reply.];B[ps](;W[qr];B[sr]C[White will have to start this ko and it is an approach-move ko for Black, as Black has to play above 5 rather than connecting.];W[ss];B[pj];W[qj];B[rs];W[pk];B[sq];W[ss]C[Now it is a direct ko.])(;W[ss]C[White should not play this way as it makes a direct ko for Black.];B[qr];W[sq];B[rs]C[If Black gets to connect the ko White is dead. White needs to win the ko and connect at 7 to live.]))(;GM[1]FF[4]SO[bgj 206]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]AB[so][ro][qo][po][oo][np][nq][nr][or][ps][rq]AW[oq][op][pp][qp][rp][sp][qr][pr]C[page 41
journal problem 5

Black to play]GN[41 - problem 5](;B[qq]C[Correct];W[rr];B[rs]C[White cannot cut this stone off without being short of liberties.](;W[qs];B[sq])(;W[sq];B[qs]))(;B[rr]C[This is incorrect.];W[rs];B[os];W[qs](;B[qq];W[sr]C[Black is short of liberties - 
White lives.])(;B[sr];W[qq]C[White lives.])))