Can you mate with Queen and Bishop versus King?

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Avatar of RubenHogenhout

Bye the way you can checkmate a black king thats in the center of the board in only 5 moves with a Queen and a King. Like this.

.

 

Avatar of RubenHogenhout
goldenwriter schreef:

You get a knight's jump away from the king

 

Rightbut a Knight jump away from the king from the other side ( of your king ) is much more handy because you so sandwich him between your king and your queen. Then he will suffocate more and the mate is more quickly. For example.  

 

Avatar of MARattigan
RubenHogenhout wrote:

madscientist2969 schreef:

Sometimes i just like to simplify things and give up the bishop.

 

  Simplefy? I would first cut off the king in a way that your kingt is directy participating. That means try to mate on d1 or h4 near your King. so for example.  

I tried using all three White pieces here and also made it mate in 7 but Nalimov comes up with an interesting improvement in your line that cuts it down to 6.

 

Avatar of tranphungochai69
Avatar of tranphungochai69

Queeny bishopy checkmate.

Avatar of MARattigan

Can you post a proof game for that position?

Avatar of KieferSmith

The bishop is actually unnecessary for the mate, and I often give it up to avoid a stalemate. A queen and a king alone are enough to mate, and it's easy to win using the "Knight's Distance" method below.

Avatar of MARattigan

To keep your queen a "knight's move" away from the enemy king would require

6. Qf5 1/2-1/2.

(Also not a very efficient approach - it's a mate in 8.)

Avatar of KieferSmith
MARattigan wrote:

To keep your queen a "knight's move" away from the enemy king would require

6. Qf5 1/2-1/2.

(Also not a very efficient approach - it's a mate in 8.)

But leaving the queen on f3 is still a knight's move away.

And of course that's not the fastest method, but as the OP is clearly a beginner, this is the best first method for beginners to learn as it's rather simple.

Avatar of MARattigan

Obviously no hope for you. This is the position you posted after move 5.

I may not be not be totally sober, but f5 sees to be the only square that conforms with your tutorial.

Edit: Tutorial seems to have disappeared!

Avatar of KieferSmith
MARattigan wrote:

Obviously no hope for you. This is the position you posted after move 5.

 

I may not be not be totally sober, but f5 sees to be the only square that conforms with your tutorial.

So you are saying that f3 is not a knight's move away from h4.

Learn chess.

Avatar of MARattigan

You did say, "put your queen a knight's move away ...". In chess it's never legal to move a piece to the square it already occupies.

Avatar of KieferSmith
MARattigan wrote:

You did say, "put your queen a knight's move away ...". In chess it's never legal to move a piece to the square it already occupies.

"put your queen a knight's move away" only refers to the first move in the sequence.

Avatar of MARattigan
MARattigan wrote:

You also said, "copy the enemy king's moves with your queen". In that position it could be difficult. It's also never legal in chess to move a piece to a square occupied by one of your own pieces.

That's what I've learned in chess so far at any rate.

Avatar of Chessflyfisher

Grasshoppers, stop arguing!

Avatar of MARattigan
KieferSmith wrote:
MARattigan wrote:

You did say, "put your queen a knight's move away ...". In chess it's never legal to move a piece to the square it already occupies.

"put your queen a knight's move away" only refers to the first move in the sequence.

Try it.

 
White to play, 50 move rule ply count=0
 

(1.Qh6# could be regarded as an improvement.)

If the lone king is not on a corner square all stalemates in this endgame happen with the queen a knight's move away from him. If beginners fail to mate, it's usually because they blunder into a stalemate.

The above isn't an isolated position. If White follows your formula from this position, for example, he must play one of the lines shown if Black plays as shown.

 
Avatar of MARattigan

Since I made that last post, the comment following White's move 2 in your original post silently changed from, "and copy the enemy king's moves with your queen.", to, "and copy the enemy king's moves with your queen, making sure to avoid a stalemate. ", which might lead anybody reading the posts to conclude the mainline in my last example above was not exactly following your prescription.

In fact your addition doesn't really add much.

Beginners already know they have to avoid stalemate, but a surprisingly high majority of them blunder into one anyway.

(And that also means they can usually successfully force the king to the edge of the board. Further forcing the king to a corner is unnecessary, contrary to what you appear to assume, because there are mates anywhere at the edge.)

Avatar of KieferSmith
MARattigan wrote:

Since I made that last post, the comment following White's move 2 in your original post silently changed from, "and copy the enemy king's moves with your queen.", to, "and copy the enemy king's moves with your queen, making sure to avoid a stalemate. ", which might lead anybody reading the posts to conclude the mainline in my last example above was not exactly following your prescription.

In fact your addition doesn't really add much.

Beginners already know they have to avoid stalemate, but a surprisingly high majority of them blunder into one anyway.

(And that also means they can usually successfully force the king to the edge of the board. Further forcing the king to a corner is unnecessary, contrary to what you appear to assume, because there are mates anywhere at the edge.)

"prescription"?

Maybe don't use words if you aren't sure of the definition, hahaha

Avatar of MARattigan

Nobody has quite answered OP's question.

The answer is, almost always yes. Here an example against Stockfish.

Probably not fastest, but I couldn't find the position in my tablebases to check.

Avatar of KieferSmith

Yes. King. And rectangle.