Married couple, both receive Social Security by direct deposit.  No dependents.  2018 and 2019 AGI, both more than $200K. 

No EIP#1 received.  But wife received $600 debit card for EIP#2.

Now, in 2020 AGI is about $194K, so RRC is just under $200.  That's based on what should have been paid for EIP#1 -- not reduced by overpayment on EIP#2.

I suppose the $600 paid to one spouse makes up for all the payments that should have been made, but weren't, to one spouse in other married couples.