(;GM[1]FF[4]SZ[19]
GN[Black to play and connect underneath]
PC[https://senseis.xmp.net/?GokyoShumyoSection6Problem68/Solution]AP[GoWiki:2009]
DT[2023-01-22]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection6Problem68/Solution

Black to play and connect underneath]
PL[B]

AB[cb][ib][cc][hc][dd][hd][de][ge][he]
AW[jb][dc][gc][jc][ed][gd][je][ff][hf][if][eg]

;B[gb]C[B1]MN[1]
;W[fb]C[W2]MN[2]
;B[fa]C[B3]MN[3]
;W[eb]C[W4]MN[4]
;B[fd]C[B5]MN[5]
;W[fc]C[W6]MN[6]
;B[fe]C[B7]MN[7]
;W[ee]C[W8]MN[8]
;B[ea]C[B9]MN[9]

;
)
