(;GM[1]FF[4]SZ[19]
GN[B1 is a mistake....]
PC[http://senseis.xmp.net/?DougSGoBlog/Februari2004]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?DougSGoBlog/Februari2004

B1 is a mistake....]
PL[B]

AB[cb][eb][fb][bc][dc][ec][bd][dd]
AW[da][gb][cc][fc][gc][cd][ed][be][ce][de][fe][cf][df]

;B[ea]C[B1]MN[1]
;W[bb]C[W2]MN[2]
;B[ab]C[B3]MN[3]
;W[ba]C[W4]MN[4]

;
)
