Date: November 17 1822
Place: Shogun's Palace
Event: Castle Games
White: Inoue Insa Inseki 6dan
Black: Kadono Jowa 6/7dan
Honinbo Jowa, having been appointed Honinbo Genjo's heir was having a particularly easy game against the head of the Inoue House. Insa did not play the marked stones, he played 4 first and resigned a few moves after that, because Jowa could easily connect his centre stones to the bottom left group. What would have happened if he had tried to prevent the connection like this?
(;AB[dq]AB[do]AB[ep]AB[fo]AB[en]AB[dm]AB[cm]AW[dn]AW[dl]AW[dk]AB[dj]AB[cj]AB[bj]AW[ci]AW[di]AW[ej]AW[fj]AW[fi]AW[eh]AW[dg]AW[cf]AW[em]AW[fm]AW[gm]AW[gl]AW[gk]AW[fk]AW[hj]AW[hi]AW[hh]AW[gg]AW[gf]AW[if]AW[jf]AB[gj]AB[gh]AB[gi]AB[fh]AB[fg]AB[ff]AB[ef]AB[ee]AB[df]AB[ce]AB[dd]AB[cd]AB[bf]AB[be]AB[bc]AW[cc]AW[dc]AW[ed]AW[fd]AW[gd]AW[fe]AB[ge]AB[he]AB[id]AB[ie]AB[hc]AW[gb]AW[ib]AW[ic]AB[kc]AB[kd]AB[ke]AW[lb]AW[na]AW[ma]AW[mc]AW[nc]AW[ob]AW[pb]AW[pc]AW[qc]AW[md]AW[ld]AW[le]AB[lf]AB[kf]AB[me]AB[ne]AB[nf]AB[mf]AB[nd]AB[oc]AB[od]AB[pd]AB[qd]AB[rd]AW[rf]AB[of]AW[oe]AW[qf]AW[qh]AW[qi]AW[qj]AB[qk]AW[qn]AW[pm]AW[pk]AB[pj]AB[oi]AB[oh]AB[og]AB[nj]AW[ni]AW[nh]AW[ng]AW[mg]AW[lh]AW[jo]AB[jq]AB[lp]AB[lo]AB[mo]AB[mq]AB[nr]AB[lr]AW[mp]AW[np]AW[nq]AW[op]AW[no]AW[nn]AW[mn]AW[po]AB[oq]AB[pq]AB[pp]AB[rp]AB[ro]AB[qo]AW[qp]AB[lj]AW[li]AB[mi]AW[ki]AB[kj]LB[ki:1]LB[mi:2]LB[lh:3]LB[kj:4]AW[mh]AB[mj]LB[mh:5]LB[mj:6]AW[ln]LB[ln:7]C[Black to make life for his centre stones]AP[goproblems]
(;B[ji];W[jh]
(;B[hg];W[hf];B[kh];W[kg];B[lg];W[kh];B[ih]C[];W[jg];B[je]C[RIGHT])
(;B[kh];W[kg];B[lg];W[kh]
(;B[hg];W[hf]C[RIGHT];B[ih]C[];W[jg];B[je]C[RIGHT])
(;B[ih];W[jg];B[hg]
(;W[hf]C[RIGHT];B[je]C[RIGHT])
(;W[ii];B[hf]C[RIGHT])))
(;B[hf];W[hg];B[kh];W[kg];B[lg];W[kh];B[ih];W[jg];B[je];W[ig])
(;B[kg];W[jj])
(;B[lg];W[kh];B[ih];W[jg]
(;B[hg];W[hf])
(;B[hf];W[hg]))
(;B[ih];W[ii]
(;B[kg];W[jj];B[hg];W[hf])
(;B[hf];W[hg];B[jg];W[ig])))
(;B[jh];W[ji];B[hg];W[hf];B[ig];W[jg];B[ih];W[kh])
(;B[hg];W[hf];B[ji];W[jh]C[RIGHT];B[kh];W[kg];B[lg];W[kh];B[ih]C[];W[jg];B[je]C[RIGHT]))