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working dupes or not
in paper log days you used to get penalized for too many dupes that weren't marked as such in the log. i don't know of any contest that has ever penalized you for working too many dupes as long as you marked them in your log and didn't try to claim points for them.
its kind of ironic that the cabrillo log format has no way to mark dupes, the sponsor's log processing software automatically rescores all the logs so you don't have to worry about even recognizing dupes or worrying about not claiming points for them.
on your specific question. you log by2a but 6y2a properly logs on5zo... 6y2a would get credit because the log checking software would properly match up the one-off call by2a with their log entry of on5zo. if there really is a by2a and they send in a log you would lose credit for a confirmed not-in-log. if there is no such callsign as by2a issued you would lose credit and penalty and lose the multiplier (assuming you didn't work any other by) as a bad call. if there is a by2a but they didn't send in a log you might get to keep the credit if the log checking software and manual checkers don't recognize the busted call.
lets take it one step further. say you really screwed up and logged by2et so the log checking software can't figure out that it was really 6y2a that you worked... now 6y2a loses qso credit and penalties for being not in the on5zo log. you may or may not lose credit as above based on the by2et log and callsign status.... now, later on you hear 6y2a and call them again. if they recognize you are a dupe and come back 'qso b4' and refuse to work you, they lose! they will never get credit for on5zo and will lose the penalty points. if instead they ignore the dupe and work you again the original not-in-log doesn't matter as they are now in your log and everyone gets credit... so not logging the dupe is bad.
the same holds for other combinations of them busting your call, or both of you busting each other, etc. it is always better to just log the dupe and move on. there is actually less of a chance you will get penalized if you work the dupe than if you don't.
david robbins, k1ttt