my rank go down

i leave codechef for some months while learning data structures , i give contest this time long challenge march 2022 in div 4 and i solve 7 question out of 8 and they got accepted but also then my rank go down , can anyone tell me why ?

Your ratings depend on your performance in previous and current contests and expectations from you to perform in your ongoing contest.

A fundamental idea of how the ELO system works is this: Whenever you participate in a contest, you compete in a duel with all other participating players. Based on your current rating and the other participating players’ rating, your probability of winning against each of them is calculated.

Your actual performance is compared against this expected performance, and correspondingly, you gain or lose some points.

Read more about the mechanism here:

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