Endgame: Can you force a win for Black?
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white to move in starting position
he took my rook
I think I found one! 3...Bd4 4. Ra5 (if Ra8, Bb6 with zugzwang), 4...Be3 5. Ra8 Bb6 with the same zugzwang
if white ever leaves the a-file with his rook or moves his king you can play a2
-edit- Disregard this, you just play Bd4 and a2 right away,there's no need for zugzwang at all.
what if 6. Ra5
Oh, sorry, I meant 5...Bb6 ofc
It's a won BNK vs K ending. They are notoriously diffucilt to convert however - even world champions can mess it up!
my opponent didn't know how to mate with knight and bishop unless it is already set up. so that was a draw akarabiner
KidGuru wrote:
my opponent didn't know how to mate with knight and bishop unless it is already set up. so that was a draw akarabiner
Well, your question was whether black could force the win, and the answer is yes 
fair enough
I actually took Silmans advice, and never bothered to learn BNK v K endings. I appreciate it might come back to bite me in the butt one day, but after thousands of games I've not come across it in my games, nor have I seen anyone come across it at my club.
AKarabiner wrote:
KidGuru wrote:
my opponent didn't know how to mate with knight and bishop unless it is already set up. so that was a draw akarabiner
Well, your question was whether black could force the win, and the answer is yes
You need to force white to take on a3 though, you can't just assume he takes it and goes into a lost endgame. I think you really need the zugzwang. Or some other trick with mate threads or blocking the a-file, but that seems a lot harder (if they even excist)
HattrickStinkyduiker wrote:
AKarabiner wrote:
KidGuru wrote:
my opponent didn't know how to mate with knight and bishop unless it is already set up. so that was a draw akarabiner
Well, your question was whether black could force the win, and the answer is yes
You need to force white to take on a3 though, you can't just assume he takes it and goes into a lost endgame. I think you really need the zugzwang. Or some other trick with mate threads or blocking the a-file, but that seems a lot harder (if they even excist)
Actually, taking on a3 is his only chance to prolong the pain. If he doesn't, it's mate in 17 rather than 26.
AKarabiner wrote:
I actually took Silmans advice, and never bothered to learn BNK v K endings. I appreciate it might come back to bite me in the butt one day, but after thousands of games I've not come across it in my games, nor have I seen anyone come across it at my club.
here's what I know of it, I've had some lessons about it, but a while ago and forgot the details (because this rarely happens).
-standard driving the king back
- mate should be in the corner with the same colored square as your bishop
-bishop and knight work best on squares of the same color.
There, now you know as much as I do about it without studying :p
NimzoRoy wrote a good article on it a while back - http://www.chess.com/blog/NimzoRoy/mate-with-kbn-vs-k---together-again-for-the-first-time
There is also this - http://bestchessgames.wordpress.com/2012/01/29/how-to-mate-with-knight-and-bishop-using-the-deletang-method/
AKarabiner wrote:
HattrickStinkyduiker wrote:
AKarabiner wrote:
KidGuru wrote:
my opponent didn't know how to mate with knight and bishop unless it is already set up. so that was a draw akarabiner
Well, your question was whether black could force the win, and the answer is yes
You need to force white to take on a3 though, you can't just assume he takes it and goes into a lost endgame. I think you really need the zugzwang. Or some other trick with mate threads or blocking the a-file, but that seems a lot harder (if they even excist)
Actually, taking on a3 is his only chance to prolong the pain. If he doesn't, it's mate in 17 rather than 26.
Oh lol, you can just play a2+ at any point and force this ending anyway. and here I was thinking I found some subtle moves to force white's rook to sacrifise.
HattrickStinkyduiker wrote:
AKarabiner wrote:
HattrickStinkyduiker wrote:
AKarabiner wrote:
KidGuru wrote:
my opponent didn't know how to mate with knight and bishop unless it is already set up. so that was a draw akarabiner
Well, your question was whether black could force the win, and the answer is yes
You need to force white to take on a3 though, you can't just assume he takes it and goes into a lost endgame. I think you really need the zugzwang. Or some other trick with mate threads or blocking the a-file, but that seems a lot harder (if they even excist)
Actually, taking on a3 is his only chance to prolong the pain. If he doesn't, it's mate in 17 rather than 26.
Oh lol, you can just play a2+ at any point and force this ending anyway. and here I was thinking I found some subtle moves to force white's rook to sacrifise.
It's not quite that simple: 3... a2+ 4. Rxa2 Nxa2 is stalemate.
In fact, it's stalemate whenever the Black king is on b3 and the black bishop is on the long diagonal.