Selfish mining

Hi!

I'm trying to develop a simulator for the bitcoin's blockhain to run some attack scenarios (51%, dossing, selfish mining, etc).

For the selfish mining I know how it works but I don't understand how this could be feasible. When the "attacker" has found a block the probability to found another one and then reach all nodes building the longest chain seems to be very low. There are some alternative strategies?

How this is related to a 51%? I mean, theoretically this behaviour is a way more difficult than a classic 51%...

Also: is the purpose to gain a double reward and waste other minners' works or is useful for double spending?

submitted by /u/d0d090
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source https://www.reddit.com/r/btc/comments/a1xzht/selfish_mining/