What's the maxim?
Not all maxims are absolute

What's the maxim?
That endgames involving Rook pawn and opposite colored Bishop is typicaly drawing. It shows the ideas behind making the ability to promote the pawn in an otherwised drawing situation.

hmm, in a nutshell, Black loses because he has a pawn.
So the lesson is: sac all our pawns before we get to the endgame.
got it!

I had a game by Botvinnik where he incorporates the same theme here to win a position that most consider drawn, yet is shown can win if played properly. The other one that is fun to look at is the Centurini Position with the Bishops on the board. All in all, this was simply a way to look past games that you might think of as draws and perhaps gain extra points in final matches or tournaments later on as well.

in situations like those it is always important to ask your self:
do i really like to kill myself out of boredom today?

Here is a link to some ideas behind the Centurini Positions you may come across. The posting is from 5 years ago.
http://blog.chess.com/likesforests/the-endgame-tactician-centurinis-rule
???
The tactical idea is to be ableto make one Bishop stronger than the other by confining him to a diagonal that is less than four squares long and then being to exchange your Bishop at the correct time to achieve a promotion to go into a QvB ending.

Bishops (2)of oppossite colors are drawish (of course how many and putting them on your colored b. squares counts) because the king sitting on a square opposite your opponents b. color can block pawn as there is no check.E.g. king on h1 vs black bishop--- pawns on h2,3,4,5, are helpless.As your b. can move along a dig. so your king does not have to move.....b/p vs. p is pretty much a win....k.opposition and bxp or kxp by creating tempo w. your b. as in above paulsen board.
L. Paulsen-Metzger: Nuremburg, 1888