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

In general]
PL[B]

AB[de][df]
AW[dd][ed][ce][cf][dg]
CR[ed]
LB[fe:a]

;B[ef]C[B1]MN[1]

;CR[ed]
LB[fe:a]
)
