(;GM[1]FF[4]SZ[19]
GN[The problem]
PC[http://senseis.xmp.net/?LargeAvalancheTurnOutwardProblem]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?LargeAvalancheTurnOutwardProblem

The problem]
PL[W]

AB[bb][db][eb][dc][ic][jc][bd][cd][ed][fd][gd][hd][ce][he][cf][hf][bg][dg][eg][bh]
AW[fb][ib][jb][bc][cc][ec][fc][gc][hc][dd][de][ee][fe][ge][df][cg][gg][ch][ci]

;W[fg]C[W1]MN[1]
;B[kb]C[B2]MN[2]
;W[kc]C[W3]MN[3]
;B[lb]C[B4]MN[4]

;
)
