Rules 2: Under/Over Specification
As we see from the previous post, induction leads to elegance. However, games often require special cases beyond a simple set of base rules. This can provide a certain amount of texture or theme.
State the general rules first. Then enumerate the exceptions using an amount of detail so as not to imply anything more or less than intended.
A player may choose one the following actions: A, B, or C. A player may never take action B followed by action A.
Huh? What is the meaning of the second sentence? Is it extraneous? Is it an example? Is it implying that a player may take action A followed by action B? Even though it isn't technically in conflict with the first sentence, its presence makes the reader wonder what they are missing. Exceptions imply things. At a minimum, players will make logical inferences.
Roll a die and move that many spaces. However, if you roll a 3, you must move exactly 3 spaces.
Again, huh? Does the second sentence imply that you may move other than your roll when you don't roll a 3? This is another example of a rules writer perhaps thinking they are being specific, but only confusing the reader.