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

Key point]
PL[B]

AB[fl][em][dn][fn][gn][qn][co][go][fp][jp][dq][fq][hq][dr][fr]
AW[en][eo][fo][jo][ko][ep][gp][hp][ip][np][pp][eq][kq][er][es]

;B[hr]C[B1]MN[1]
;W[iq]C[W2]MN[2]
;B[ir]C[B3]MN[3]
;W[jr]C[W4]MN[4]
;B[ds]C[B5]MN[5]
;W[fs]C[W6]MN[6]
;B[gr]C[B7]MN[7]

;
)
