bishop king and knight checkmate?

how I can do this? any techniques?

in chess.com mobile app> COMPUTER> KEY POSITIONS.. find it and try it versus computer. if you can't find that key position, create a custom setup

in chess.com mobile app> COMPUTER> KEY POSITIONS.. find it and try it versus computer. if you can't find that key position, create a custom setup

An excellent conceptual overview with very good examples of the king, bishop and knight versus lone king mate is found in Bruce Pandolfini's "The ABCs of Chess" column in the October 1979 issue of Chess Life and Review.  It is reprinted in Mr. Pandolfini's book The ABCs of Chess, which is a collection of his Chess Life and Review columns.  It can be purchased new or used.

I just had a game where I had two knights.  game didn't draw at that point so i guess it's possible but I just gave up and gave him one of my knights.  He was dumb enough to take it instead of trying to win on time.  He was up by about 45 seconds

K v K+N+N is a draw since the mate can't be forced.  The weaker side could walk into a mate though. Had you ran out of time, it would have been a draw anyway.

()
http://www.chess.com/forum/view/endgames/checkmate-with-knight--bishop
()
https://www.chess.com/forum/view/general/who-here-knows-out-to-mate-with-kbn-vs-k
()
How to Checkmate with Knight and Bishop | Chess Endgame Basics #1
https://www.youtube.com/watch?v=hWwuy-aiK1M
GM_Huschenbeth
()
Checkmate with Knight & Bishop Korobov vs Petrosian Blitz
https://www.youtube.com/watch?v=ePyx5rLxnb4
()
Polgar's game
http://www.chessgames.com/perl/chessgame?gid=1092636
()
How to Checkmate with Bishop and Knight
https://www.youtube.com/watch?v=r3EqM17jvOc

Martin_Stahl,

In a K v K+N+N  endgame, mate can be forced (in two) from some configurations.

However, from the vast majority of configurations best play is, of couse,  draw.

hi

I think it is 32 moves with best play, from the worst possible initial position.

youtube help you

Back to K+B+N vs K:

Woman's world champion (at the time) Anna Ushenina demonstrates how not to win this endgame.

Em Barrass Ing.

A fischer ending.. its in chess.com lessons

The trick to mating with B+N vs loan King is to memorize it in one direction, and then flip and rotate for the other 7 scenarios.

The way I learned it was to shove the King to a1, and then drive it up to a8 (so in this case, your bishop is light).  Then there are 2 manouvers to remember and the rest you should be able to figure out.

Shove the King to a1 with your King on c3, checking with the Knight on b3, waste a move so the King must go to a3, then play Bb1.

Then you start the "W-Moment" of the Knight.  In other words, the moves are not consecutive, but the Knight's next 4 moves if Black plays ideally (alternative moves are just easier for White).

The Knight's next 4 moves will be Nb3-d4-b5-c6-b7.  When the King goes to a4, Nd4 is played here, followed by the King.

The other one move to remember, what was referred to as the "Magic BIshop Move" is Bf5.

I don't know how to describe the order of moves.  It's more something you can only illustrate.  What is shown below is starting from the wrong corner.

Now mentally remember this, and flip and rotate for the appropriate situation, like if you need to go from h1 to a1, the W-manouver is Nf2-e4-d2-c4-b2 and the magic bishop move is Bd6

no

Sqod has listed some good videos, but I've pared them down to those that illustrate the two major maneuvers in the K+B+N v K mate.  Both of these maneuvers are covered in Bruce Pandolfini's column; please see Post #4.

Regarding K+N+N v K, it is never a forced mate because the knight cannot lose a move like a bishop.  However, K+N+N v K+P is a forced mate if the pawn stands within a certain boundary known as the Troitsky line.  A single knight and king will hold the opponent's king in the corner while the other knight releases the pawn.  That knight will maneuver into position to mate the cornered king before or just as the pawn queens.

For a complete treatise on this most difficult mate, get Troitsky's Collection of Chess Studies.  Alexey Troitsky was one of the most talented Russian composers of chess endgame studies.  Tragically, he died of starvation, as so many others did, during the siege of Leningrad.

Life is too short to study K versus K-N-B endings. 

Especially since it almost never happens. 

Wrong, Dodger, it's not the destination but the journey the matters.  There is much to be learned from how the bishop and knight work together with the help of the king to corral the opponent.  The lesson is not just about the B+N+K v K mate, but how to coordinate these pieces in other situations.

KBN-K is not very difficult if you know that mate is only possible in the corner that has the shade of the Bishop. When driving the bare King out of the center you usually cannot prevent it from taking shelter in one of the other corners, so such mates usually end in nudging the bare King along the board edge from the save corner to the deadly one. There are indications that this can actually be done on boards of any size, although the technique then is slightly more complex (and slow) as on 8x8. Because you then have to prevent as well that the bare King makes a dive for the deadly corner voluntarily, so fast that the slow King and Knight cannot keep up with it, so that it can finds its way back to the center. On 8x8 such an attempt only speeds up the mate, although you cannot prevent the King from leaving the edge. But B+N can confine it in the deadly corner sector, and with the aid of your King you can then constrict its prison towards the deadly corner for the final blow.

In Team-Mate Chess there are several more such end-games, where color binding of one of the pieces makes that mate is only possible in half of the corners (Knight + Elephant, Elephant + Mortar and Mortar + Phoenix, where Mortar and Elephant are the color-bound pieces).

It has already been posted in No. 8 and re-posted in No 19.