Lucky guy
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Two Solo Miners Solve Blocks In Quick Succession Defying Mind Shattering Odds https://www.btctimes.com/news/two-solo-bitcoin-miners-solve-block-quick-succession
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[...] that particular miner's chances were about 1 in 6000 since the time they'd started mining.
I have since confirmed that this is indeed a new miner, that joined less than 2 days ago presumably in response to the other lucky block solver, so they've been astronomically lucky in solving a block solo in that time.