Go (Baduk, Weiqi) problems with solutions

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Go art problem 011

11 Black to play Save the group in the middle of the lower side with a one-step ko (from the Hatsuyoron, by the 4th Inoue Inseki)

(;GM[1]FF[4]SZ[19]AP[goproblems.ru]
AB[ci][pi][jj][cl][el][kl][em][fm][gm][hm][km][rm][dn][en][qn][bo][do][io][jo][ko][po][ro][bp][cp][hp][ip][mp][np][pp][qp][rp][hq][kq][cr][fr][hr][kr][rr][hs][is][ls][ms]
AW[ch][bi][ei][qi][qj][ek][ik][fl][gl][ql][rl][bm][lm][nm][pm][fn][hn][in][kn][ln][pn][co][fo][ho][dp][lp][aq][dq][fq][gq][lq][oq][qq][rq][br][gr][ir][jr][lr][mr][or][as][fs][gs][ns][rs]
C[11
Black to play
Save the group in the middle of the lower side with a one-step ko
(from the Hatsuyoron, by the 4th Inoue Inseki)
]
;B[jn];W[jm];B[lo];W[mo];B[mn];W[no];B[kk];W[kj];B[im];W[jl];B[kp];W[ks]
;B[js];W[jq];B[dr];W[er];B[go];W[gn];B[fp];W[gp];B[ep];W[ds];B[cq];W[cs]
;B[ls];W[qr];B[bq];W[ms];B[ap];W[iq];B[eq];W[ks];B[jp];W[jr];B[ar];W[jq]
;B[bs];W[ir];B[ls];W[go];B[eo];W[ks];B[iq];W[jr];B[es];W[ds];B[cs];W[jq]
;B[ls]TE[1])

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