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chris21 8 ( +1 | -1 )
Mating question. Is it possible to force mate with a king, a bishop and a knight?

brobishkin 97 ( +1 | -1 )
Yes vs. a lone King... Of all the opposing pieces, the endgame with the Bishop and Knight is the most difficult... The combination of a Bishop and Knight forces a different kind of mating approach... There are 4 principles to keep in mind while mating the lone King...

1. The superior side must use all of his pieces along with the King to create a wall as opposed to a box...

2. The lone King can only be mated in the corner of the same color as the Bishop...

3. Normally the lone King will have to be driven to the wrong corner first, and then, using the wall technique, driven to the right corner...

4. The defender will try to stay in the center for as long as possible and when finally forced to, run to the wrong corner... Never forget about the 50 moves to force a win...

It can be done within 50 moves... But one wrong move can cost you a draw... This type of mating pattern must be studied, practiced, and deeply known... This is one of the most played out endings in tournament play... Due to its difficulties...

chris21 7 ( +1 | -1 )
Thanks very much. Looks like I have a job on my hands!
caldazar 64 ( +1 | -1 )
It's actually not that difficult to learn; you can easily learn it in one evening. Break the problem down into three parts. First, stick the opposing king in the center and practice driving the king towards any edge of the board. Next, practice driving the king that is near the edge to the nearest wrong corner. Finally, practice driving the king from the wrong corner to a correct one to deliver mate. After awhile, you'll start to notice that for each phase of the mating technique, there are only a couple of patterns that work. Having a KBN vs. K endgame tablebase to practice on helps a lot.
commodore 42 ( +1 | -1 )
Mating Problem... A bath, some deoderant, colonge, Altoids, a little blue pill and the Kama Sutra? If this doesn't work there are a million web options to study endings and as many books avalible. Your particular mating problem could take 30-50 moves to solve. It is patience and techincal ability, again many avalible studies either with paper or wed based. GL in your research.
spurtus 32 ( +1 | -1 )
Regarding 50 moves...

I was under the impression that there are circumstances where you can in defense make it difficult enough that the 50 moves expire before giving mate.

IF this is true?... then a computer tablebase should be able to demonstrate that this isnt so clear cut as it seems.

atrifix 23 ( +1 | -1 )
Not so the absolute longest ("worst" starting) position to mate with a KBN vs. K is 33 moves, I believe. You can almost always get away with a few mistakes and still mate in less than 50 moves, as long as they aren't key mistakes.