Quote from: coinmachina on August 26, 2017, 05:28:15 PM

Why is it impossible? All big pools are well connected but one of them might be just slightly better connected then the others.
Moreover selfish mining even increases your relative share of blocks if you have a poor connectivity to the network but a minig power of about 33%.

No such thing. Once the data has left the miner it propagates across the internet at the same rate these days. That's like saying you will shoot a missile after someone else shoots one when you see it and it will arrive first, even though they both travel at the same rate. By the time you've seen it it has already travelled some distance, possibly even all the distance to its targets. It takes a maximum of 200ms to get to anywhere on the internet these days except during network outages and connectivity failures. There is latency involved between one bitcoin node receiving a block and propagating it to another bitcoin node, but no miner is only connected to just one node.