Go (Baduk, Weiqi) problems with solutions

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Go art problem 013

13 Black to play Capture the three white stones in the lower left corner (a shicho problem by Hayashi Genbi)

(;GM[1]FF[4]SZ[19]AP[goproblems.ru]
AB[ka][la][ib][cc][rc][cd][rd][sd][se][df][rg][bh][ci][ak][sk][el][sl][em][gm][pm][qm][sm][en][fn][sn][ao][bo][co][eo][dp][ep][eq][gq][lq][gr]
AW[aa][ca][da][ja][qa][fb][jb][sb][ac][ae][re][rf][sf][cg][ah][ai][bj][rj][rl][am][dm][rm][cn][dn][gn][on][do][go][qo][ro][bp][cp][fp][dq][sq][sr][ks][ms]
C[13
Black to play
Capture the three white stones in the lower left corner
(a shicho problem by Hayashi Genbi)
]
;B[bq];W[cq];B[dr];W[cr];B[br];W[cs];B[ap];W[er];B[bs];W[ds];B[fs];W[fr]
;B[gs];W[fq];B[es];W[dr];B[gp];W[fo]
(;B[hn];W[ho];B[io];W[hp];B[hq];W[ip];B[jp];W[iq];B[ir];W[jq];B[kq];W[jr]
;B[kr];W[js];B[ls];W[lr];B[is];W[ls]
(;B[mr];W[ns];B[nr];W[os];B[or];W[ps];B[pr];W[qs];B[qr];W[rs];B[rr];W[ss]
;B[sp];W[rq];B[rp];W[qq];B[qp];W[pq];B[pp];W[oq];B[op];W[nq];B[mq];W[np]
;B[no];W[mp];B[mo];W[lp];B[kp];W[lo];B[ln];W[ko];B[jo];W[kn];B[km];W[jn]
;B[in];W[jm];B[jl];W[im];B[hm];W[il];B[ik];W[hl];B[gl];W[hk];B[hj];W[gk]
;B[fk];W[gj];B[gi];W[fj];B[ej];W[fi];B[fh];W[ei]
(;B[di];W[eh];B[eg];W[dh];B[ch];W[dg];B[bg];W[cf];B[ce];W[bf];B[be];W[af]
;B[ad];W[ag];B[aj];W[bi];B[bk];W[cj];B[dj];W[ck];B[cl];W[dk];B[ek];W[dl]
;B[bn];W[bd];B[cm];W[ad];B[bc];W[ab];B[ba];W[bb];B[cb];W[ba];B[ea];W[db]
;B[eb];W[dc];B[ec];W[dd];B[de];W[ed];B[fd];W[ee];B[ef];W[fe];B[ge];W[ff]
;B[fg];W[gf];B[hf];W[gg];B[gh];W[hg];B[ig];W[hh];B[hi];W[ih];B[jh];W[ii]
;B[ij];W[ji];B[ki];W[jj];B[jk];W[kj];B[lj];W[kk];B[kl];W[lk];B[mk];W[ll]
;B[lm];W[ml];B[nl];W[mm];B[mn];W[nm];B[om];W[nn];B[oo];W[pn];B[qn];W[po]
;B[so];W[rn];B[rk];W[ql];B[qk];W[pl];B[ol];W[pk];B[pj];W[ok];B[nk];W[oj]
;B[oi];W[nj];B[mj];W[ni];B[nh];W[mi];B[li];W[mh];B[mg];W[lh];B[kh];W[lg]
;B[lf];W[kg];B[jg];W[kf];B[ke];W[jf];B[if];W[je];B[jd];W[ie];B[he];W[id]
;B[ic];W[hd];B[gd];W[hc];B[gc];W[hb];B[gb];W[ha];B[ga];W[ia];B[jc];W[kb]
;B[lb];W[kc];B[kd];W[lc];B[mc];W[ld];B[le];W[md];B[nd];W[me];B[mf];W[ne]
;B[oe];W[nf];B[ng];W[of];B[pf];W[og];B[oh];W[pg];B[qg];W[ph];B[pi];W[qh]
;B[qi];W[rh];B[ri];W[sh];B[si];W[sg];B[qf];W[qe];B[pe];W[qd];B[qc];W[pd]
;B[od];W[pc];B[pb];W[oc];B[nc];W[ob];B[nb];W[oa];B[na];W[pa]
(;B[ra];W[qb];B[rb];W[sa];B[pb])
(;B[qb];W[ra]))
(;B[eh];W[di];B[dj];W[dh];B[dg];W[ch];B[bg];W[cf];B[bf];W[ce];B[be];W[de]
;B[ee];W[dd];B[dc];W[ed];B[fd];W[ec]))
(;B[ns];W[mr];B[nr];W[mq];B[mp];W[nq];B[oq];W[np];B[no];W[op]))
(;B[ho];W[hn];B[in];W[hm];B[hl];W[im];B[jm];W[il];B[ik];W[jl];B[kl];W[jk]
;B[jj];W[kk];B[lk];W[kj];B[ki];W[lj];B[mj];W[li];B[lh];W[mi];B[ni];W[mh]
;B[mg];W[nh];B[oh];W[ng];B[nf];W[og];B[pg];W[of];B[oe];W[pf];B[qf];W[pe]
;B[pd];W[qe]))

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