Go (Baduk, Weiqi) problems with solutions

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Go art problem 004

4 Black to play Make life in the upper left corner (a shicho problem, composed by Inoue Dosetsu)

(;GM[1]FF[4]SZ[19]AP[goproblems.ru]
AB[fa][ka][la][ra][cb][db][eb][fb][ib][lb][pb][cc][fc][mc][nc][qc][dd][jd][md][ee][je][me][ne][bf][cg][dg][mg][og][sg][bh][nh][oh][rh][sh][mi][bj][rj][sj][al][il][jl][am][bm][im][cn][gn][qn][bo][co][so][gp][kp][sp][iq][jq][fr][gr][lr][nr][qr][sr][ds][ls]
AW[ga][ja][pa][qa][bb][gb][jb][kb][ob][rb][sb][ec][gc][oc][bd][cd][ed][gd][kd][sd][de][le][se][cf][ef][lf][nf][rf][rg][lh][mh][bi][li][pi][aj][ak][ik][jk][sk][bl][sl][cm][jm][sm][hn][kn][rn][fo][ro][cp][hp][ip][aq][fq][kq][lq][hr][kr][as][cs][fs][gs][hs][js][os][ps][qs][rs][ss]
C[4
Black to play
Make life in the upper left corner
(a shicho problem, composed by Inoue Dosetsu)
]
;B[bc];W[ac];B[ad];W[ae];B[ab];W[aa];B[ca];W[ad];B[fe];W[fd];B[dc];W[df]
;B[ba];W[ab];B[ce];W[be];B[af];W[ce];B[ff];W[eg];B[eh];W[fg];B[gg];W[fh]
;B[fi];W[gh];B[hh];W[gi];B[gj];W[hi];B[ii];W[hj];B[hk];W[ij];B[kk];W[jj]
;B[ji];W[kj];B[lj];W[ki];B[lg];W[kh];B[kg];W[jh];B[ih];W[jg];B[jf];W[ig]
;B[hg];W[if];B[hf];W[ie];B[he];W[id];B[hd];W[ic];B[hc];W[jc];B[kc];W[lc]
;B[ia];W[kc];B[ld];W[ke];B[kf];W[mf];B[ng];W[of];B[pf];W[oe];B[od];W[pe]
;B[qe];W[pd];B[pc];W[nd];B[qd];W[od];B[nb];W[oa];B[qb];W[sa];B[na];W[ra]
;B[sc];W[rc];B[rd];W[sc];B[sf];W[re];B[qf];W[qg];B[pg];W[qh];B[qi];W[ph]
;B[pj];W[oi];B[ni];W[oj];B[ok];W[nj];B[mj];W[nk];B[nl];W[mk];B[lk];W[ml]
;B[mm];W[ll];B[kl];W[lm];B[ln];W[km];B[ko];W[jn];B[in];W[jo];B[jp];W[io]
;B[hq];W[ho];B[go];W[hm];B[hl];W[gm];B[fm];W[gl];B[gk];W[fl];B[el];W[fk]
;B[fj];W[ek];B[dk];W[ej];B[ei];W[dj];B[cj];W[di];B[dh];W[ci];B[ch];W[ai]
;B[ah];W[bk];B[ck];W[cl];B[dl];W[dm];B[em];W[dn];B[do];W[en];B[fn];W[eo]
;B[ep];W[fp];B[gq];W[eq];B[dq];W[er];B[dr];W[es]
(;B[ir];W[is];B[ks];W[jr];B[mq];W[lp];B[lo];W[mp];B[np];W[mo];B[mn];W[no]
;B[oo];W[nn];B[nm];W[on];B[pn];W[om];B[ol];W[pm];B[qm];W[pl];B[pk];W[ql]
;B[rl];W[qk];B[qj];W[rk];B[rm];W[sn];B[rp];W[qo];B[po];W[qp];B[qq];W[pp]
;B[op];W[pq];B[pr];W[oq];B[nq];W[or];B[ns];W[dp];B[rr];W[ep];B[cq];W[bp]
;B[bq];W[ap]
(;B[ao];W[ar];B[br];W[bs];B[cr])
(;B[ar];W[br]))
(;B[is];W[ir];B[jr];W[dp]))

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