(;GM[1]FF[4]SZ[19]
GN[Efficiency (2)]
PC[http://senseis.xmp.net/?TheEmptyTriangleIsBad]AP[GoWiki:2009]
DT[2018-06-28]
C[Diagram from http://senseis.xmp.net/?TheEmptyTriangleIsBad

Efficiency (2)]
PL[B]

AB[fh][fi][fl][fm][hm][fp][fq][iq]
CR[hm]
SQ[iq]
LB[jq:a]

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

;CR[hm]
SQ[iq]
LB[jq:a]
)
