In Lisp / Scheme, people may create a tiny language to express the problem. Steps: 1. Create a new language in which the problem is trivially expressed. 2. Sol

In Lisp / Scheme, people may create a tiny language to express the problem. Steps: 1. Create a new language in which the problem is trivially expressed. 2. Solve the problem in the new language. Lisp / Scheme are ideal for this. Example: solve some sort of puzzle game. Create a data structure that represents the board, a game piece and a move. Operators upon these. Given a board and a legal move, return a new board with the move applied. Given a board, give all of the possible legal moves (for a particular player if this a multi-player game instead of a puzzle). Once you have that language it becomes easy to use your favorite off the shelf search algorithms. Depth first. Breadth first. A*. Etc. But, this is probably not the same reason to create a "language" as the article. And the notion of "language" is quite different.