(;GM[1]FF[4]SZ[19]
GN[Black to play and connect underneath]
PC[https://senseis.xmp.net/?GokyoShumyoSection6Problem67/Solution]AP[GoWiki:2009]
DT[2023-01-23]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection6Problem67/Solution

Black to play and connect underneath]
PL[B]

AB[bb][fb][hb][bc][gc][cd][dd][gd][cf]
AW[cb][ib][cc][ec][fc][ic][ee][ge][he][df]

;B[ea]C[B1]MN[1]
;W[db]C[W2]MN[2]
;B[ca]C[B3]MN[3]

;
)
