I too love exactas Stix and have been "lured" in by some similar results to the examples you have given. However I also find (and this is purely anecdotal) that there is just as many (if not more) races where the exacta is a bit disappointing. I sometimes wonder if I would be better just putting the equivalent money into a boxed quinella (i.e. a greater number of units).

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Ever get the feeling that the world is a tuxedo and you are a pair of brown shoes?