That's why we haven't started doing it yet :-p
K & 2 B vs. K

How about the K+N+B vs. K endgame? That's the hard one.
I agree with you there chessblood but one already exists here:-
http://www.chess.com/forum/view/general/check-mate-with-knight-and-bishop#
I'm still having trouble with that one - hope I never have to play it in an actual game !
Wikipedia is really helpful too for things like this - try the following:-
http://en.wikipedia.org/wiki/Bishop_and_knight_checkmate
{ Strange how little info' there is on this site, or perhaps I just havn't found it yet. But I searched for 'PGN' in chessopedia the other day & it came back with no result ! }

Is it fair to say that black's best hope is for a draw ? Starting from that assumption, these were my first thoughts:-
This strategy just doesn't seem to work, so I tried something else:-
This looks much better to me - get one of the bishops onto the 'promoting' square as soon as possible & occupy or attack the next one up.
I havn't found a way that black can win from the starting position given but it's early days !
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Yes, the second one looks good. Now one has to bring their king in to kill the pawn. I think I see one thing you didn't cover, and that was not bringing the pawn down in the second alt.

One major problem with the 'red' variation in your diagram Clavier - at move 7, bishop captures pawn ! That's essential.
This is black's predicament - the only way to attack the blocking bishop on c1 is to abandon the pawn. And if it protects the pawn then in a few moves, white's king is going to arrive & force the black king away. Black just can't win in this position.
There are things about my second diagram above I don't like at all now. For instance, Bb2 is just bad. My thinking has moved on quite a bit & I only see the need for one bishop to physically block the pawn's path while the other one just makes a nuisance of itself.
What do you think of this - can you see any problems ?
I've tried shuffling the black pieces in various combinations but the result is always the same - white wins.
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How about the K+N+B vs. K endgame? That's the hard one.