The makers of Medieval: Total War have drawn on the writings of ancient Chinese philosopher Sun Tzu to inform the artificial intelligence (AI) controlling the games computer players. Michael de Plater, creative director at Creative Assembly which made Medieval, said Sun Tzu's classic work The Art of War was a great guide for the writers of the AI. "He wrote large sections of it as concrete rules," said Mr de Plater. "We have built these straight into the AI." The rules give advice on what to do if enemies are approaching over bridges, how to outflank, when to press home an advantage and how to fight cautious and rash opponents.