In this classic chess game - Evgeny Sveshnikov illustrates typical ideas of the Sveshnikov variation
1) Fight for control over d5 square
2) Pressure on the 'f' file
3) e5-e4 and Ne5 maneuver with kingiside attack
Even a positional giant like Efim Geller struggles to contain Black's active play and ultimately succumbs in time trouble.
An unexamined life is not worth living.