"A new tyre allocation for qualifying [known as ATA, or ‘Alternative Tyre Allocation’] will be tried out for the first time, with the obligation to use just the Hard in Q1, Medium in Q2 and Soft in Q3 if conditions stay dry," explained Isola.
I was thinking this could have an impact on strategy in the race because of how teams run qualifying. Sometimes teams don't have new tyres of a specific compound (usually softs) for the race and I thought this would make that less likely to happen, but apparently the total number of available sets for the weekend will go down from 13 to 11 as well.
"The ATA also saves two sets of dry tyres compared to the traditional format [using 11 sets instead of 13)] and it will be run again at the Italian Grand Prix in Monza.