Warp wrote:
>   About the only game type where difficulty level directly correlates to
>   AI
> strength are board game programs, chess programs being the most prominent
> example. (There might be other examples in some sports and strategy games.
> I don't play many of those, so I really don't know.)

In chess, adjusting the difficulty may mean adjusting the depth used in
the 'tree' of possible decisions. That is, not looking too far into the
future.

I have also seen algorithms that take exponential time or similar, and the
program sets a time limit. When the time limit is reached,
the 'best-so-far' move is performed. Increasing the time limit may let the
computer make better moves.

(Disclaimer: I don't know how to play chess. I know the rules, I know how
each piece can be moved, but that's not the same as "knowing how to play")

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