You must choose a unit measure in this case since there is not any convention.
Likewise what is "a score"? or in this case a Spike - ATH ? I mean, if you count 5 minutes, ok each value in 5 minutes bigger of previous can be an ATH.
Of course You will not have the same result if you choose 15 minutes or 1 minute!
Moreover... does the exchange or the FIAT has sense on this? Can this change the outcome?
Ok, as I see my exchange rates, I saw that for today (until now) the max value the BTC goes was @$89,920. However, based on Coinmarketcap, the biggest value for today was @$89,956.88 which is also the ATH. So, for today (until now) the ATH has changed once. If in 24hrs surpasses this price, then we will have new no matter what, and it will change twice. So if you bet 2, you will be the winner. If not change or change more than 2, you lose. We are talking about the ATH price, which is like hitting a World Record in a sport. I mean, this won't last forever even if we wish for it!