- In the 18th century they announced their first rule: 'Sortez les pieces' -- 'Get the pieces out'.
- It took a hundred years before a new rule was announced [London 1851]: 'Move that one of your pieces which is in the worst plight, unless you can satisfy yourself that you can derive immediate advantage by an attack'.
- A few decades went by, tournaments became of frequent occurrence, and the masters, coming together oftener than before, evolved a 'public opinion'. That tended toward the rule: Avoid the moves of Pawns in the opening as far as possible.
- I have added to these principles the law: Get the Knights into action before both Bishops are developed.
The first two 'rules' definitely apply to chess960 and the third probably applies, but I'm not sure about the fourth. Is it a specific rule that applies mainly to the traditional start position (SP518: RNBQKBNR) and its twin (SP534: RNBKQBNR), is it a rule of thumb that applies to a family of start positions, or is it a general rule for all such positions?