[greymule]

Regarding those colored lines, I would draw the red lines on the inside of the bases. If a pop landed just to the fair side of 3B or 1B, I'd call it fair regardless of where it went after that. "Past the base," in other words, is past the leading (interior) edge of the base—thus past any part of the base, not necessarily entirely past the back edge.

This is to be consistent with the fact that a ball that hits the leading edge of the base is fair, and the fact that a ball that hits just inside 1B or 3B (but not past the back edge) and bounces over the bag and into foul territory would also be fair.

I'd move the blue line in slightly, too, to the "front" of the bags.