The starting price (SP) is the odds on a horse at the time a race begins. As odds often fluctuate in the build up to a race, many sites give punters the choice between the current odds or SP when placing a bet. If you choose the SP, you could get better or worse odds, depending on how they change. Most bookies also offer ‘best odds guaranteed’ promotions. This means that if a punter places a fixed odds bet and the SP offers better odds, the payout will be calculated using the SP.