[shireboy]

I've written code for some reconciliation systems and it's nice to have confirmation they are indeed hard nuts to crack. The language matching isn't really the hard part IMO. What's tricky is that you're often matching batches "up to N", and the matching is not always just on a equal values or dates. For example, 300 credit card swipes at point of sale might match 3 deposits in the bank account a few days later with a 3% fee deducted. They never clear on the _same_ day, but need to match nearest day first. To brute-force, you need test all batches of up to 300 point of sale transactions and all batches of up to 3 deposits.