One of the most significant differences between Brazilian jiu-jitsu and “traditional martial arts” like Karate, Tae Kwon Do, and others is that BJJ is not yet done cooking. New moves, strategies, and concepts are constantly being created. One of the most recently concepts to emerge is that of “systems.”
A system is essentially a game-plan that covers a wide range of conditions and moves you toward some central goal. John Danaher is probably not the inventor of “systems” but his recent work on leg-attacks and his even more recent back-attacks system have pushed the word into mainstream usage. Danaher’s leg-lock system is basically centered around achieving the leg-entanglement known as ashi-garami and from there hunting for a heel hook. The focused nature of the system is important. While one could theoretically transition into and out of a variety of systems, they typically include a start-to-finish mindset. Once you’ve spent the time and energy entering into the leg-lock system it simply doesn’t make sense to transition out of it.
But are systems really all that new?