Go (Baduk, Weiqi) problems with solutions

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Go art problem 005

5 Black to play Kill the white stones on the upper side (a shicho problem by Hayashi Genbi)

(;GM[1]FF[4]SZ[19]AP[goproblems.ru]
AB[ba][bb][bc][cc][ec][kc][lc][mc][nc][oc][pc][qc][rc][bd][cd][dd][ed][fd][gd][hd][id][jd][kd][ae][be][mf][dg][rg][fh][nh][oh][ph][rh][ai][bi][ei][fi][ri][rj][sj][bk][dk][hk][nk][pk][bl][dl][pl][bm][km][an][bn][dn][hn][in][nn][on][sn][do][ko][mo][dp][kp][mp][dq][br][fr][hr][ir][jr][kr][qr][rr][sr][ks][os]
AW[ga][ab][cb][db][eb][gb][ac][dc][gc][ic][jc][rd][le][af][cf][nf][pf][qf][eg][fg][gg][pg][sg][ah][bh][ch][qh][sh][mi][oi][qi][dj][gj][oj][ak][ik][mk][sk][al][cl][el][hl][kl][ml][cm][fm][hm][mm][rm][sm][cn][jn][ln][go][jo][oo][po][ap][lp][aq][cq][eq][gq][hq][iq][jq][lq][rq][cr][er][nr][as][bs][cs][hs][is][ms][ns][qs][rs]
C[5
Black to play
Kill the white stones on the upper side
(a shicho problem by Hayashi Genbi)
]
;B[hc];W[hb];B[ia];W[jb];B[fb];W[fc];B[ca];W[fa];B[da];W[ea];B[ja];W[kb]
;B[ka];W[lb];B[la];W[mb];B[ma];W[nb];B[na];W[ob];B[oa];W[pb];B[pa];W[qb]
;B[qa];W[rb];B[ra];W[sb];B[ib];W[sc];B[re];W[qd];B[se];W[sd];B[qe];W[pd]
;B[pe];W[od];B[oe];W[nd];B[ne];W[md];B[me];W[ld];B[lf];W[ke];B[kf];W[je]
;B[jf];W[ie];B[if];W[he];B[hf];W[ge];B[gf];W[fe];B[ff];W[ee];B[ef];W[de]
;B[df];W[ce];B[cg];W[bf];B[bg];W[ag];B[ci];W[dh];B[di];W[eh];B[gh];W[hg]
;B[hh];W[ig];B[ih];W[jg];B[jh];W[kg];B[kh];W[lg];B[lh];W[mg];B[mh];W[ng]
;B[og];W[of]
(;B[rf];W[qg];B[pi];W[qj];B[pj];W[qk];B[ql];W[rk];B[rl];W[sl];B[rn];W[qm]
;B[qn];W[pm];B[pn];W[om];B[nm];W[ol];B[nl];W[ok];B[nj];W[ni];B[mj];W[li]
;B[lj];W[ki];B[kj];W[ji];B[jj];W[ii];B[ij];W[hi];B[hj];W[gi];B[gk];W[fj]
;B[fk];W[ej];B[ek];W[cj]
(;B[bj];W[ck]
(;B[dm];W[co];B[cp];W[bo];B[bp];W[ao];B[bq];W[ar];B[dr];W[ds];B[fs];W[es]
;B[fq];W[ep];B[fp];W[eo];B[fo];W[en];B[fn];W[em];B[gm];W[gl];B[gn];W[fl]
;B[im];W[il];B[jl];W[jk];B[jm];W[kk]
(;B[lk];W[ll]
(;B[mn];W[lm];B[lo];W[kn];B[jp];W[io];B[ip];W[ho];B[hp];W[gp];B[gr];W[kq]
;B[mq];W[lr];B[mr];W[ls];B[or];W[nq];B[oq];W[np]
(;B[op];W[no];B[qo];W[pp];B[qp];W[pq];B[pr];W[qq];B[rp];W[sq];B[sp];W[ro]
;B[sa])
(;B[no];W[op];B[pp];W[qo];B[ro];W[rp];B[qp];W[so]))
(;B[lm];W[mn];B[lo];W[kn];B[jp];W[io];B[ip];W[ho];B[hp];W[gp]
(;B[kq];W[gr])
(;B[gr];W[kq];B[mq];W[lr];B[ls];W[mr];B[or];W[nq];B[oq];W[no])))
(;B[ll];W[lk];B[lm];W[mn];B[lo];W[kn];B[jp];W[io];B[ip];W[ho];B[hp];W[gp]
;B[gr];W[kq];B[mq];W[lr];B[mr];W[ls];B[or];W[nq];B[oq];W[no]))
(;B[co];W[dm]))
(;B[ck];W[bj]))
(;B[qg];W[rf]))

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