Hmmm. Weird. My hypothesis would be that Freehand/Flash/Corel's A-A engine is much cruder, in that they disregard lines bordering on 1 pixel screen display, treating them all as the same. So they produce pretty good A-A - by sacrificing the greater subtlety and precision found in the XX1 and AICS approach, which _tries_ to take account of "border-line cases" line widths.