(;GM[1]FF[4]SZ[19]
GN[Efficient]
PC[http://senseis.xmp.net/?posting=10995]AP[GoWiki:2009]
DT[2017-08-22]
C[Diagram from http://senseis.xmp.net/?posting=10995

Efficient]
PL[B]

AB[ab][bb][cb][db][eb]
AW[fa][fb][ac][bc][cc][dc][ec][fc]

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

;
)
