(;GM[1]FF[4]SZ[19]
GN[Expensive wall]
PC[http://senseis.xmp.net/?SmallAvalanche]AP[GoWiki:2009]
DT[2010-03-02]
C[Diagram from http://senseis.xmp.net/?SmallAvalanche

Expensive wall]
PL[W]

AB[db][eb][fb][dc][gc][cd][gd][ce][ee][ge][df]
AW[bc][cc][ec][fc][dd][ed][fd][de][fe][cf]

;W[ff]C[W1]MN[1]
;B[gf]C[B2]MN[2]
;W[fg]C[W3]MN[3]

;
)
