Originally Posted by
Ganchrow HG
This has the makings of an OG (Original Ganch) analysis, and we should probably move the thread to the main forum, since it is an interesting case.
But the rule as is, I am pretty sure, is actually completely fair.
The books want to give no artificial advantage to either an over or an under, even as small as this one would be, considering how relatively rarely rainouts happen.
If you grade a rain-shortened game that has already gone over as a win for the over, but don't grade a rain-shortened game that has stayed under as a win for an under, you are giving an edge to overs. Think of it this way: imagine completed games, some over and some under. If you lop off 3 innings, and grade games the way you are suggesting, then ALL of the under wins get erased. But only SOME of the over wins will get erased. This shows how that system gives an advantage to over bettors.
By the same token, if you decide ok, we'll just grade unders as wins if the game is under and gets called, even if it hasn't been finished, then you are giving an edge to under bets, because fewer innings obviously benefit an under bet and hurt an over bet. If you set a line assuming 9 innings, with the possibility of extra innings, but you will grade a rain-shortened under as a win, then you are giving an edge to under bettors, because they can get lucky and get a few fewer unplanned innings, while over bettors can't get a few extra unplanned innings (the possibility of extra innings is factored into the 9-inning line).
So the only fair way to do it is to cancel all bets that don't go 8.5 full innings.
Of course, they could, if they wanted to, grade games to have these edges for overs or unders, and then adjust the lines accordingly. But if they set the lines strictly assuming 8.5/9 innings, with the possibility of extra innings, the way they grade the games now is the only fair way.