text: **Definitory and strategic rules**
  
  The main focus of most logicians is to study the criteria according to which an argument is correct or 
  incorrect. A fallacy is committed if these criteria are violated. In the case of formal logic, they are known 
  as*rules of inference*.[93] They are definitory rules, which determine whether an inference is correct or 
  which inferences are allowed. Definitory rules contrast with strategic rules. Strategic rules specify which 
  inferential moves are necessary to reach a given conclusion based on a set of premises. This distinction 
  does not just apply to logic but also to games. In chess, for example, the definitory rules dictate that 
  bishops may only move diagonally. The strategic rules, on the other hand, describe how the allowed 