(;GM[1]FF[4]SZ[19]
GN[Black connects]
PC[https://senseis.xmp.net/?GokyoShumyoSection6Problem23/Solution]AP[GoWiki:2009]
DT[2023-01-24]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection6Problem23/Solution

Black connects]
PL[B]

AB[cb][gb][cc][gc][ic][dd][gd][ce][ge][cf][ef][ch]
AW[db][ib][dc][fc][jc][fd][jd][ee][df][ff][if][gg][eh]

;B[fa]C[B1]MN[1]
;W[eb]C[W2]MN[2]
;B[fb]C[B3]MN[3]
;W[ec]C[W4]MN[4]
;B[da]C[B5]MN[5]

;
)
