(;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]
;W[db]C[W3]MN[3]
;B[cc]C[B4]MN[4]
;W[cb]C[W5]MN[5]
;B[bb]C[B6]MN[6]
;W[hc]C[W7]MN[7]

;
)
