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Discarding losses on time could plausibly be the bulk of the effect.

I can improve my chess rating in short time controls by a good 50+ points just by reminding myself to move quickly.

True. Also, people tend to take more time when in losing positions, so it is likely that more of the discarded games than the not-discarded games would have been lost.

It would be very interesting to see a computer analysis of position strength in the discarded games and seeing, where possible, if the ratios of "likely win" and "likely loss" match the games that were finished.

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