(;GM[1]FF[4]SZ[19]
GN[Continuation. W18 at B15]
PC[http://senseis.xmp.net/?CaveProblem/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?CaveProblem/Solution

Continuation. W18 at B15]
PL[B]

AB[ba][ca][da][ea][ma][na][bb][nb][ac][cc][nc][oc][bd][cd][dd][od][qd][de][ee][fe][he][oe][ff][gf][hf][if][jf][nf][dg][gg][ig][jg][ng][ch][dh][eh][fh][hh][oh][di][ii][ni][oi][pi][qi][ri][dj][ij][mj][qj][sj][ck][dk][hk][ik][jk][kk][lk][mk][nk][pk][qk][rk][dl][fl][gl][il][ll][ml][nl][ql][cm][em][fm][im][mm][qm][rm][an][en][fn][gn][ln][ao][bo][co][fo][ho][ro][so][bp][dp][lp][np][qp][dq][eq][fq][lq][nq][oq][pq][qq][rq][cr][er][ir][mr][nr][qr][sr][ds][es][fs][gs][ns]
AW[fa][ha][la][cb][db][eb][gb][ib][jb][lb][mb][dc][ec][fc][jc][mc][ad][ed][fd][gd][hd][jd][nd][ae][be][ce][ge][ie][je][me][ne][bf][cf][df][ef][kf][mf][cg][eg][fg][kg][mg][bh][ih][jh][mh][nh][ci][ji][mi][cj][jj][kj][lj][nj][oj][pj][bk][ok][sk][bl][cl][el][hl][jl][kl][ol][pl][rl][sl][am][dm][gm][hm][jm][km][lm][nm][pm][sm][bn][cn][dn][hn][in][jn][mn][on][pn][qn][rn][sn][do][eo][go][mo][no][qo][cp][ep][fp][gp][mp][op][pp][gq][hq][mq][fr][gr][hr][kr][lr][hs][ls][ms]

;B[jq]C[B11]MN[11]
;W[jr]C[W12]MN[12]
;B[iq]C[B13]MN[13]
;W[is]C[W14]MN[14]
;B[js]C[B15]MN[15]
;W[ks]C[W16]MN[16]
;B[kq]C[B17]MN[17]
;W[js]C[W18]MN[18]
;B[hp]C[B19]MN[19]
;W[bm]C[W20]MN[20]

;
)
