(;GM[1]FF[4]SZ[19]
GN[Black to play and connect underneath]
PC[https://senseis.xmp.net/?GokyoShumyoSection6Problem25/Solution]AP[GoWiki:2009]
DT[2023-01-24]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection6Problem25/Solution

Black to play and connect underneath]
PL[B]

AB[ga][cb][gb][dc][fc][hc][dd][hd][ce][ee][he][cf][if][ig]
AW[db][fb][hb][ib][ec][jc][ed][de][ge][ie][je][ef][gf][hf]
CR[hc][hd][he]

;B[fd]C[B1]MN[1]
;W[fe]C[W2]MN[2]
;B[ea]C[B3]MN[3]

;CR[hc][hd][he]
)
