While searching for a good Taxman game I found another nice game algorithm developed by David Bau (http://davidbau.com).
He developed a game that applies a reverse engineering to the classic Tic Tac Toe.
The goal is to achieve a game with no winner (tie). This seems easy but is in fact much more difficult than the standard game. I'm still not sure you can apply a specific recipe for achieving a tie.
Second implementation is completely the reverse of classic Tic Tac Toe - so your goal is to loose, not to win. Curiously it's hard when the computer algorithm is trying to loose too.
Credits for both algorithms and implementations go to David Bau, http://davidbau.com.