Personal Marathon #1: Bogie and Bacall

I have recently finished a mini-marathon...the four films that Humphrey Bogart and Lauren Bacall made together:

To Have and Have Not (1944) which was very much like Casablanca (Bogart's breakout role)
The Big Sleep(1946) which was my favorite though the plot was a bit complicated
Dark Passage (1947) which was the weakest of the quartet but still a fine film
Key Largo (1948) which had a sweet Bacall instead of the femme fatale I'd come to expect

Of course, they fell in love and ended up together in every film as well as in real life. Chemistry? On-screen and off-screen, it seems.