(;GM[1]FF[4]SZ[4]
GN[Moves 17-20]
PC[http://senseis.xmp.net/?LongestPossibleGame]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?LongestPossibleGame

Moves 17-20]
PL[B]

AB[aa][ab][bb][cb][db]
AW[ac][bc][cc][dc][dd]

;B[ad]C[B7]MN[7]
;W[da]C[W8]MN[8]
;B[bd]C[B9]MN[9]
;W[ca]C[W10]MN[10]

;
)
