I imagine that only the corporate that runs the tote can do it after it's closed, which would give their fixed odds business a big advantage. I have heard that the TAB let their most special customer do it as well. I have also heard a story about a phone operator making a mistake and then correcting it while the race was in play.

That's all just unsubstantiated rumours.

One thing I know for sure is that after they close there is a delay while all of the money from the co-mingled pools comes in, which definitely accounts for some of the price movement.

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