(;GM[1]FF[4]SZ[19]
GN[Ko fight for the second line connection]
PC[https://senseis.xmp.net/?SecondLineConnection]AP[GoWiki:2009]
DT[2023-03-29]
C[Diagram from https://senseis.xmp.net/?SecondLineConnection

Ko fight for the second line connection]
PL[B]

AB[ee][cf][df][ff][dg][dh][di][cj][dj][fj][dk][dl][dm][cn][dn][eo][ep]
AW[cd][ce][de][bf][cg][ch][ci][bj][ck][cl][cm][bn][co][cp][cq]

;B[bi]C[B1]MN[1]
;W[ai]C[W2]MN[2]
;B[bk]C[B3]MN[3]
;W[ak]C[W4]MN[4]

;
)
