if you are connected to a pool it can give you bitcoin less than block size according to your hashpower .So that you may get 1 or 2 btc. If you mine solo and find block then you cant have less than block size. Bytheway 1 or 2 btc share is too big you have to have a huge mining farm.
Ok I see, thanks or the answer. So basically instead of mine it alone they share the pow "puzzle" and after solving it first , the 12,5 btc are divided to everyone who participated considering that someone who calculated more hashes per second will receive more than someone who had a less hashrate, right?