The concept is his cure. It is a curated collection of 250 hand-picked tactical and positional exercises designed to simulate the specific mistakes opponents make at the club level.
Although the exercises are grouped, the protocol often suggests interleaving. For instance, after completing a bow‑control exercise, the next cycle may involve a left‑hand agility task, deliberately to enhance discrimination and reduce contextual interference . Research shows that such interleaving leads to more robust retention than blocked practice. simon fischer practice 250 pdf
The wins on efficiency . You don't need 1000 puzzles; you need the right 250 puzzles, repeated until perfect. The concept is his cure