(;GM[1]FF[4]SZ[19]
GN[Black to play and connect underneath]
PC[http://senseis.xmp.net/?GokyoShumyoSection6Problem1/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection6Problem1/Attempts

Black to play and connect underneath]
PL[W]

AB[eb][fb][hb][cc][gc][dd][ed][hd][de][fe][df][ff][gf]
AW[db][ib][jb][dc][ec][fc][fd][jd][ee][ge][ef][jf][gg][hg]
SQ[db][dc][ec][fc][fd]

;W[he]C[W1]MN[1]
;B[gd]C[B2]MN[2]
;W[eg]C[W3]MN[3]
;B[cb]C[B4]MN[4]

;SQ[db][dc][ec][fc][fd]
)
