Tarrasch is associated by Hans Kmoch as the 'Scientific Style'

Tarrach took some of the Steinitzian principles in a different direction - for example emphasising the importance of piece mobility and control of space as being more important quite often than structural weaknesses. A concrete opening example of this is the Tarrasch defence in the Queens Gambit where black often accepts an Isolated Queens pawn. Tarrasch noted that an IQP can often provide knight outpost support on advanced squares which often outweighed the apparent structural weakness. He preferred not to have cramped positions, and enjoyed using central superiority to attack on both sides of the board. He popularised Steinitz's findings and reduced them to easy to use rules and formulations such as 'Develop knights before bishops' and 'Dont move a piece too many times in the opening'.

The revolt against Tarrasch and pushing the boundaries of 'rule-based chess' - The Hypermodern Revolution. The emphasis was now to find and emphasise useful exceptions - not rules.

The impact of Nimozvich and 'My System'

Nimzovich is associated by Hans Kmoch with the hillarious annotation in the overprotection Immortal (see #35 video): 'But it is a generally known fact that originality and modernism were introduced by me as my own personal inventions and enthusiastically immitated (without being fully understood) by the whole world of chess!'

Key Nimzovich terminology introduced into the game included: Blockade, Undermining, Overprotection, Restrain-Blockade-Destroy, Rook on the 7th, Prophylaxis. It should be noted that some of these ideas seem to be reflections of an ancient chinese book called 'The Art of War'. Also some ideas seem to echo previous generations such as Staunton's experimental use of overprotection, and fianchettoing bishops.