Fortunately, The Password Game gives you a little hint in the link to the Wikipedia page for algebraic chess notation. In short, it’s a series of characters that indicate a move in chess ...

The semantics are defined for a number of meta-instructions which perform operations ... The language sophistication contemplated is midway between an assembly language and an advanced algebraic ...

In fact, there is an infinite number of perspectives from which the fictive motion can be seen. Therefore, an algebraic representation of a function can be embodied in terms of a fictive motion in an ...