Many players get round the ever increasing amount of opening theory with their own little specialities. This makes a lot of sense from a practical point of view, whoever adopts such lines will probably have a better knowledge of them than their opponents and a better knowledge of the ensuing middle game.
One such ideas is 6…Qb6 in the Nimzowitsch Sicilian (1.e4 c5 2.Nf3 Nf6 3.e5 Nd5 4.Nc3 Nxc3 5.dxc3 Nc6 6.Bf4 Qb6), which is really quite annoying for White as it’ definitely a concession to weaken the queenside with 7.b3. There’s not much theory which leaves plenty of scope for original analysis.
The leading exponent of this line is the Russian Grandmaster Aleksandr Rakhmanov. In the following game he beats Viktor Bologan with this 6…Qb6 idea: