Yes, on Grand Master level it's very normal to resign ''early'', when you're a pawn down it's sometimes a waste of time to play on..
Games w/o end?
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Yes, Grandmasters sometimes see 8+ moves ahead and see that they have lost, so they simply save time and resign right away, unless of course it was a blitz game.
Why do so many of the games featured in the "Explore" file have no clear-cut ends? People resigning THAT early? Yes, I'm new.
Thanks,
Grandpa-Amm