(;GM[1]FF[4]SZ[19]
GN[W to play, invade]
PC[http://senseis.xmp.net/?Submarine/Discussion]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?Submarine/Discussion

W to play, invade]
PL[W]

AB[dd][fd][ce]
AW[cf][df]

;W[fb]C[W1]MN[1]
;B[be]C[B2]MN[2]

;
)
