1 in a billion': Second tiny miner solves a block

In what one mining expert has described as “one in several billion odds,” two tiny individual BTC miners have solved a block two within days of each other in the same mining pool.

How Small Solo Miners Solve Bitcoin Blocks - Bitcoin Magazine - Bitcoin News, Articles and Expert Insights

If the blockchain block reward goes to the winner of the “Race,' how is it that the most powerful miner doesn't always win? - Quora

Bitcoin Proof of Work — The Only Article You Will Ever Have to Read, by Henrique Centieiro & Bee Lee

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Solo Bitcoin Miner Solves Block With Hash Rate of Just 10 TH/s, Beating Extremely Unlikely Odds - Decrypt