A bishop for a color
I really like endgames with bishops of opposite colors. At moments one may think that a draw is within reach, but then there's sudden tactics which makes one of the two players win.
Opposite colored bishop endings can be very drawish.
Here a GM example, where white with 3 pawns up, could not force a win :
Here's a game I played today, in which I managed to force a win, with a few tactics, in an ending with opposite colored bishops.
Wikipedia article about opposite colored bishops, with several examples :
Game source of the GM game :