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

Normal extension]
PL[B]

AB[fc][ed][fd][jd]
AW[dc][ec][cd][cf]

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

;
)
