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1668 vs 1593 is not significantly higher-rated, but more or less the same level. 100 points is a typical step.
Nigel Short once said he lost to Bobby Fischer on ICC. Clearly there were a lot of Fischers going around. Beginning to sound a bit like Elvis Pressley.
That is the true meaning of FischeRandom. You never know which Fischer you are playing against.
You do have to sort of wonder what happened to her rook...