Fair point. But we'll eventually settle on some rules. The thought is like the following: people actually compose chess puzzles for fun, without regard to them

Fair point. But we'll eventually settle on some rules. The thought is like the following: people actually compose chess puzzles for fun, without regard to them appearing in an actual game: There's chess puzzle composition competitions. Could one write a program to make a monster puzzle (or better, the most complicated) with forced moves? That is: maximize X in "white to move and mate in X moves" restricted to board size and standard chess rules.