(;GM[1]FF[4]SO[bgj 208]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]AB[rr][qr][qq][oq][or][mr]AW[rq][rp][qp][pq][po][op][mp][lq][lr]C[page 3
journal problem 1

Black to play and live.]GN[3 - problem 1](;B[pr]C[This play is incorrect, Black cannot make two eyes.];W[sr];B[nq];W[ns];B[ms];W[rs];B[qs];W[os])(;B[sr]C[This also fails.];W[pr];B[ps];W[pp];B[nq];W[ns];B[ms];W[os]C[The left eye is now false.])(;B[ps]C[This is the correct play.];W[sr];B[rs];W[nq];B[nr];W[ms];B[ns]C[White cannot take away the two eyes.]))(;SO[bgj 208]AP[Sabaki:0.52.2]ST[2]FF[4]CA[UTF-8]GM[1]SZ[19]PB[Trouble master]PM[2]FG[259:]GN[12 - trouble master problem 1]KM[6.5]RU[Japanese]PW[YD S28 4th lecture]C[page 12
Trouble Master Book 2 problem 1(done)];PL[W]C[Book 2 problem 1
Level ***]AW[ok][ca][jf][sk][nf][pf][sf][ma][qa][gs][cn][ms][gn][hn][di][kn][ln][fi][gi][nn][rn][ed][gd][jd][qi][ri][si][nd][cq][dq][bl][iq][jq][dl][lq][fl][gl][nq][dg][rq][eg][ml][gg][ab][ol][bb][pl][cb][jg][db][rl][sl][mg][pg][lb][sg][ob][pb][qb][bo][eo][fo][ej][mo][ee][he][ie][ke][le][ne][oe][gr][hr][ir][kr][mr][gm][im][ch][dh][lm][mm][ac][hh][om][ih][qm][dc][ec][fc][mh][nh][oh][ph][qh][kc][lc][sh][mc][oc][bp][ep][ck][ek][np][op][pp][qp][rp][ff]AB[qk][da][kf][rk][ea][lf][fa][mf][qf][ka][la][ra][fs][fn][os][in][ci][jn][ad][hi][ii][ji][dd][mi][ni][hd][id][pi][ld][md][od][pd][bq][fq][gq][hq][kq][hl][oq][pq][qq][ll][nl][ql][kg][eb][gb][ib][qg][kb][rg][rb][go][ho][bj][cj][dj][ko][gj][be][de][kj][oj][pj][qj][rj][sj][me][pe][re][se][br][cr][dr][er][fr][fm][nr][hm][bh][km][rr][sr][gh][nm][bc][pm][cc][jh][lh][gc][jc][rh][pc][qc][cp][fp][bk][ip][kp][fk][hk][cf][jk][df][ef][lk][mk][nk](;LB[ia:A][rc:B][ge:C][bg:D][em:H][jm:F][pn:E][qs:G])(;B[tt](;FG[259:]PM[2]MN[1];W[ia]C[A: Dia 1:
This is a vital point. It is important to
hold back the A-B sente exchange before
playing this attachment. Black has several responses, but none of them work]LB[ga:B][fb:A](;FG[259:]PM[2]GOWRITEFG[includePastCount:0];B[ha];W[fb];B[ga];W[hc]C[Dia 2: Black 2 is the standard response.
However, White 5 is double atari, and
the whole group dies!])(;FG[259:]PM[2];B[jb];W[ga];B[ha];LB[hc:A]TR[da][ea][fa][eb]W[fb]C[Dia 3:
This response does not work either.
White 3 is a throw in tesuji and after
5, it creates a similar result to Dia. 2.
Black cannot save the four triangled stones because of the double atari at A]))(;FG[259:]PM[2]MN[1];W[fb];B[ga];W[ia];C[Dia 4: If White ataris first, nothing works. So
it is important to refrain from obvious
sente exchanges!]B[jb]LB[ga:2][ia:3][fb:1][jb:4])(;FG[259:]PM[2]MN[1];W[rc]C[B: Dia 1: This technique is precisely the same
concept as problem A. It is crucial not to
make the A-B exchange before playing
this cut!]LB[qe:B][rf:A](;FG[259:]PM[2]MN[2];B[rd];LB[qe:A][sc:B]TR[qf][qg][rg][rh]W[rf]C[Dia 2: If Black responds with 2, it is easy.
White can atari at 3 and look for A or B
as miai.])(;FG[259:]PM[2];B[sc];W[rd];B[sd];W[rf]TR[qf][qg][rg][rh]C[Dia 3: Therefore, Black must atari underneath
at 2. However, even after reaching 5,
Black has to sacrifice the four triangled stones.
If Black tries to save those four stones...];FG[259:]PM[2];B[qe];W[sb];B[qd];W[rc]C[Dia. 4
White can set up a double snap back
with 7 and 9.]TR[rc]))(;FG[259:]PM[2]MN[1];W[rf];B[qe];W[rc];B[sc];W[rd];B[sb]LB[sb:6][rc:3][sc:4][rd:5][qe:2][rf:1]C[Dia 5:
If White plays the atari at 1 before 3,
Black can simply respond with 6, and
there will be nothing for White here.])(;FG[259:]PM[2]MN[1];W[bg]C[D:];B[cg];W[ah];B[bi];W[cd];B[bd];W[bf];B[ce];W[af];B[ai];W[ak]C[Dia 1:
This is a forced sequence, and the
outcome is a one-step ko, which can be
quite challenging for Black to handle.])(;FG[259:]PM[2]MN[1];W[jm]C[F:];B[kl];W[jo]C[Dia 1:
A bonus problem. You must be able to
identify this type of issue with 100% accuracy in your games!]LB[kl:2][jm:1][jo:3])(;FG[259:]PM[2]MN[1];W[qs]C[G: Dia 1:
Another problem of the same type as
problems A and B. Keep a hold of the A-B
exchange until playing a move inside]LB[or:B][qs:1](;FG[259:]PM[2];B[qr];W[rs](;B[or];W[ps]C[Dia 2:
This is the best result for both. White
can create a seki, nullifying Black's territory entirely, as opposed to conceding
six points.]LB[or:4][qr:2][ps:5][rs:3])(;B[ps];W[or]LB[or:5][qr:2][ps:4][rs:3]C[Dia 3:
Black 4 is the wrong response. The
throw-in at White 5 is a well-known
skill. Black is dead.]))(;FG[259:]PM[2];B[rs];W[ns];B[qr];W[or];C[Dia 4:
Black can respond like this to make a
three-point living shape. But it costs one
point to live, so it is two points better
than seki. Nonetheless, this choice results in losing sente.]B[ps]LB[or:5][qr:4][ns:3][ps:6][rs:2])))(;C[C:]B[kd];W[je];B[ge];W[fd];B[ig];W[hg];C[Dia 1: 
Finding this type of trouble is not
dependent on reading skills; it is more
about having the intuition to notice it,
and that sense comes from experience.]B[hf])(;C[E:]B[pn];W[on];B[rm];W[sm];B[qn]LB[rm:3][sm:4][on:2][pn:1][qn:5]C[Dia 1: 
Black 3 is a common throw-in technique. It rescues Black's three stones
through a ko.])(;C[H:]B[dp];W[eq];B[em]LB[el:B][em:3][do:A][dp:1][eq:2]C[Dia 1: 
A move like 3 can often be overlooked
by many Go players because it creates
an "ugly" empty triangle shape and
doesn't employ any fancy techniques.
However, in this situation, it is the only
possible option since A and B are miai.]))(;GM[1]FF[4]SZ[19]CA[UTF-8]SO[bgj 208]AP[Sabaki:0.52.2]GN[23 - problem 2]AB[np][nq][op][kq][mq][pq][pr][qq]AW[oo][pp][qp][rp][oq][or][rq][nr]C[page 23
journal problem 2

Black to play and rescue three stones.](;B[ps]C[This is the correct play.](;W[qr]C[This is White's toughest response.];B[rr](;W[rs](;B[mr]C[Black must fill this liberty now.])(;B[qs]C[This is wrong - White gets a ko.];W[sr](;B[ss])(;B[mr];W[qr]))(;B[sr]C[With this Black runs out of liberties];W[os];B[qs];W[qr]))(;W[sr](;B[rs]C[Black must play here.])(;B[qs]C[This is wrong - White gets a ko.];W[rs])))(;W[qs]C[This is often a tesuji.];B[rr];W[os];B[qr];W[sr];B[rs]C[Playing atari below white 6 would be  self-atari, so Black wins the race.];W[sq];B[mr]))(;B[mr];W[qr]C[Just filling a liberty fails.])(;B[rr]C[This also fails.];W[ps];B[qr];W[sr];B[rs];W[sq])(;B[qs]C[As does this.];W[rr];B[mr];W[qr]))(;GM[1]FF[4]SZ[19]CA[UTF-8]SO[bgj 208]AP[Sabaki:0.52.2]GN[24 - ko diagram 1]RU[Simple]AB[go:ho][jo][dp:dr][ep:fp][hp:ip][fq:fr][jq:js][er:es][lr][gs]AW[co:cs][do:fo][gp:gr][hq:iq][ir:is][ds][hs]PL[W]PB[ master]C[page 24
ko diagram 1 - hon-ko (direct ko)];W[fs])(;GM[1]FF[4]SZ[19]CA[UTF-8]SO[bgj 208]AP[Sabaki:0.52.2]GN[25 - ko diagram 2]RU[Simple]AB[go:ho][jo][dp:dr][ep:fp][ip][fq:fr][jq:js][er:es][lr][gs]AW[co:cs][do:fo][gp:gr][hq:iq][ir:is][ds][hs]PL[W]LB[hp:A]C[page 25
ko diagram 2 - itte-yose-ko
(one-move approach-move ko)];W[fs])(;GM[1]FF[4]SZ[19]CA[UTF-8]SO[bgj 208]AP[Sabaki:0.52.2]GN[25 - ko diagram 3]RU[Simple]AB[go:ho][jo][dp:dr][ep:fp][ip][fq:fr][jq:jr][er:es][lr][gs]AW[co:cs][do:fo][gp:gr][hq:iq][ir:is][ds][hs]PL[W]LB[hp:A][js:B]C[page 25
ko diagram 3 - nite-yose-ko
(two-move approach-move ko)];W[fs])(;GM[1]FF[4]SZ[19]CA[UTF-8]SO[bgj 208]AP[Sabaki:0.52.2]GN[25 - ko diagram 4]RU[Simple]AB[dn:en][eo][go][ap:dp][fp:fs][aq][cq][br]AW[cl][dm][cn:co][ao:bo][do][ep:es][dq][cr][bs][ds]C[page 25
ko diagram 4 - nidan-ko
(two-stage ko)];B[as];W[ar])(;GM[1]FF[4]SZ[19]CA[UTF-8]SO[bgj 208]AP[Sabaki:0.52.2]GN[26 - ko diagram 5]RU[Simple]AB[dn:en][eo][go][ap:dp][fp:fs][aq][cq][br][as]AW[cl][dm][cn:co][ao:bo][do][ep:es][dq][cr][bs][ds]C[page 26
ko diagram 5 - nidan-ko continuation];B[cs])(;GM[1]FF[4]SZ[19]CA[UTF-8]SO[bgj 208]AP[Sabaki:0.52.2]GN[27 - ko diagram 6]RU[Simple]AB[co][ep:hp]AW[dq:eq][gq:hq]PL[W]C[page 27
ko diagram 7 - nidan bane
(two-step hane)];W[ip];B[io];W[jo])(;GM[1]FF[4]SO[bgj 208]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]AB[rs][rr][rq][qq][pq][ps][op][oo][no][mo][lo][lp][kq][kr][ks]AW[lq][lr][ls][mp][np][oq][or][pr][qr][qs]C[page 27
journal problem 3

Black to play and kill.]GN[27 - problem 3](;B[nq]C[Playing this atari fails to kill all the white stones.];W[nr];B[mq];W[mr]C[White is alive at the cost of two stones.])(;B[mq]C[This is no different.];W[mr];B[nq];W[nr])(;B[mr]C[This fails too.];W[mq];B[nr];W[ns])(;B[nr]C[This is the correct play.];W[nq]C[This is white's strongest defence.];B[ms]C[However this threatens a snap-back.];W[mq];B[os];W[ns]C[After this black recaptures (7 at 5) and creates a killing shape.];B[os]))(;GM[1]FF[4]SO[bgj 208]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]AB[rr][rq][rp][qp][po][oo][no][mp][mq][nq][kp][kq][kr]AW[lr][mr][nr][oq][op][np][qq][qr][pr]C[page 31
journal problem 4

Black to play and kill.]GN[31 - problem 4](;B[pp]C[This takes away one potential eye.];W[os];B[pq];W[qs]C[But White can make two eyes still.])(;B[qs];W[pp];B[os];W[ps]C[White lives easily.])(;B[os]C[This is correct first play.];W[ns];B[or]C[Black sacrifices a second stone.];W[ps];B[or];W[os];B[pp]C[Now it takes two plays to make two eyes, so White is dead.](;W[pq];B[ls])(;W[ls];B[pq])))(;GM[1]FF[4]SO[bgj 208]AP[Sabaki:0.52.2]SZ[19]CA[UTF-8]AB[rr][rq][rp][pp][op][mp][lq][kq][jr][js]AW[qs][qr][pr][or][os][mr][ks]C[page 33
journal problem 5

Black to play and kill.]GN[33 - problem 5](;B[lr]C[This fails to kill.];W[ms];B[nr];W[nq];B[mq];W[oq];B[ls];W[ns])(;B[ls];W[ms]C[As does this.])(;B[ms]C[This is the correct play.];W[lr]C[This is white's strongest defence.];B[kr];W[ls];B[nr];W[ns];B[nq]C[But the eye is now false and the white stones are dead.]))(;CA[UTF-8]SZ[19]SO[bgj 208]AP[Sabaki:0.52.2]MULTIGOGM[1]GN[36 - game of legends]PB[Takemiya Masaki]BR[9p]PW[Otake Hideo]WR[9p]RE[W+R]CO[Ichiriki Ryo 9p][Michael Redmond 9p]US[Antti Törmänen]KM[6.5]C[page 36
game of legends];B[pd];W[dc];B[pp];W[cq];B[ce];W[fd];B[pj];W[nc];B[dp];W[cp];B[dn];W[ep];B[eo];W[dq];B[fp];W[do];B[fo];W[cn];B[dm];W[cm];B[dl];W[nq];B[lp];W[no];B[pn];W[pr];B[qq];W[lr];B[ld];W[ne];B[pf];W[ng];B[mf];W[nf];B[ph];W[jd];B[kf];W[oi];B[pi];W[lh];B[ie];W[hc];B[jh];W[nm];B[cl];W[cd];B[bd];W[de];B[df];W[cf];B[be];W[bf];B[cb];W[ch];B[db];W[eb](;B[ee];W[dd];B[bc](;W[dg];B[ef];W[ed];B[gf];W[cj];B[pb];W[fh];B[ge];W[oc];B[pc];W[lc];B[di];W[eg];B[dj];W[hh];B[kh];W[bk](;B[jp];W[lj];B[jk];W[gj];B[gl];W[ek](;B[qr];W[ij];B[jj];W[hl];B[gm];W[gk];B[jr];W[hm];B[mh];W[lg];B[mg];W[lf];B[le];W[mi];B[kc];W[jc];B[me];W[ke];B[nh];W[kl];B[jl];W[jm];B[km];W[kn];B[lm];W[ll];B[ln];W[mm];B[jn];W[im];B[ml];W[mk]L[nl][ol][nk][oj]C[Geta A, B, C, D])(;B[fb]C[Variation for 83 "B"](;W[ea]C["C"];B[da]C["D"];W[dk]C[Tenuki - here or anywhere else.];B[fc];W[ec];B[kd];W[kc];B[ic];W[id];B[gd];W[gc];B[hd];W[ib];B[hb];W[jc];B[gb];W[ic];B[fe])(;W[pl]C["E"])))(;B[id]C[Variation for 77];W[ic];B[kc];W[kd];B[mc];W[lb];B[md];W[mb];B[ke];W[jc];B[nd]))(;W[ab]C[Variation for 60 "A"];B[ae];W[ac];B[bb];W[da];B[ca];W[aa];B[fb];W[fc];B[ea];W[ec]))(;B[jp]C[If 57 played elsewhere...];W[ae]C[...variation for 58.];B[cc];W[dd];B[ac];W[af];B[ba];W[bc];B[bb];W[ad];B[da]))