here is a situation I just ran into which is not so infrequent.
race 5 at Epson, the 4/1 exacta paid $31.10, the $1 win bet returned $2.80
at 1 minuet too post the exacta pool was $3,740, the final pool was $11,071
using the 1 min to post exacta pool data I constructed a $1 payout of $4.04 on the winning combination, while the final pool data construct had a $1 payout of only $2.87 (which by the way as you can see, beat the straight pool $1 return.)
here is the 1 min to post construct indicating "your choice" as #4 over all.
the idea is, if your win bet choice is the #4, then you should bet the 4 over all, using the bet sizes indicated.
Code:
"UK Epsom
Race
5
Post
11:25
MTP
1
$1 Exacta Pool
$3,704"
YOUR CHOICE OVER pgno bet size
1 13
2 3
3 21
4 0
5 27
6 11
7 20
8 4
9 0
10 0
11 0
12 0
13 0
14 0
15 0
16 0
100