Place only betting means that there is no show betting in the race.
Just win and place because there are not enough horses in the race to allow for show betting.
This is because the track feels it would lose money if they allowed show betting.
99.9% of all races have win ,place and show betting.
If you bet a horse to win he has to win in order for you to win money.
If you bet a horse to place you will get money if he wins or places(comes in 2nd)
If you bet a horse to show(comes in 3rd) you will get money if he wins,places or shows.
In most cases but not always a horse will pay more to win and less for 2nd and even less for 3rd becuase of the pool money bet in the race.
To put it simply when you bet on a horse he has to finsih as well or better than you bet him for in order for you to cash your ticket.

