The AI is very good. If you leave an opening the AI will take advantage of it and make you suffer. Trench warfare is modeled perfectly. Trying to break through the front line can be very difficult. The same as it was during the war. Offensive operations take planning. Trying to blast your way thru the enemy without considering artillery support and ammunition will just lead to defeat. In this game as during the war artillery is king. Diplomacy, production and research are simplified, but don't let that worry you. The focus here is the fighting. The PBEM system is fantastic. This game can be played in higher resolutions, even in window mode. I play at 1920x1080. CTGW is rock stable on my computer.