I played against the AI. Is that the same thing as playing against the PO? (What does PO stand for?)
When I played as the Germans, I believe I took Bratislava early, and the game ended on the next turn. If I remember correctly, when that happened, France and Great Britain made it clear they would not intervene, and the Czechs capitulated. I don't think I was even half-way through the turns. I was surprised at how quickly the game ended.
When I played as the Czechs, I essentially played delay (which Karri recommended against), and the Germans pushed me around almost at will. Rather than counterattack, I repeatedly consolidated as best I could. My western troops got separated from my eastern troops. However, I didn't lose Praha, Bratislava, or Ostrava. At some point I got news messages that France and Great Britain had joined on my side and that the Germans were withdrawing various divisions to meet that threat. When the game ended, if I remember correctly, I believe I won (because the result surprised me), and I assumed it was because I had hung on long enough to encourage France and Great Britain to enter on my side and because I didn't lose the main supply hexes (Bratislava and Ostrava) or Praha. From the military standpoint, I felt like I'd gotten kicked around, but from the strategic standpoint, I apparently had accomplished precisely what was expected of me.