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Bishop, Knight & King versus King.

  • #141

    It is more difficult to do it in the shortest number of moves against accurate defence, but even that would be easy if you knew how.

  • #142
    GoodKnight0BadBishop wrote:

    The American Flag is what is next to my username.

    Oh.

  • #143
    GoodKnight0BadBishop schreef:
    MARattigan wrote:
    GoodKnight0BadBishop wrote:
    xman720 wrote:

    1: Can you show how that works in the relevant position instead of an easy position.

    2: I'm pretty sure if black hadn't run straight towards h1 it would've taken a lot longer to mate him.

    You give me a position and I can checkmate from there.

    After after Black's obvious 6...Ke5 in your example, can you still do it in 19?

     

    I'll offer to play Black against you in this one if you like.

    Black to move.

     

    Whoa! If it is black to move in that position, then he'll play Kf3 followed by the unstoppable Kg2 trapping the knight! Those positions are exceptional positions where a piece is lost. Give another position.

     

    Right with black on move the knight is lost. With White on move you can win like this.

     

     

  • #144

    One move quicker is:



     

  • #145
    drbob_mccord wrote:

     I got it once in a practice game but that was only once in many attempts. It only takes one slip in the worst case 30 move position to give away a half point. Still there is a technique, but I wouldn't steer into this ending in an over the board game and expect to win. If you have a chess computer it wins infallably and Paul Keres explains how to do it well in his book "practical chess endings" but you can't take the book into a tournament or use a chess computer!

    I bought Keres' book once, though it opted not to get off the train at the same stop as me a few days later.

    I was put off Keres' explanation by the fact that he blundered with Black on move 2 and then failed to take advantage on move 3 with White.

    Curiously I had occasion to get Batsford Chess endings recently and noticed they do exactly the same, and as far as I can remember (it was about 45 years ago I bought Keres) from the same starting position. (Not accusing anyone of copying you understand.)

    This is not a small blunder. I tried playing the Nalimov EGTB  from the position after move 2 in BCE and finished in half the time the text takes. I think Keres might even have taken one move longer than BCE.

  • #146

    My Keres book has long gone too, but someone on this site explained it much better than Keres and now having looked at this forum I wouldn't be scared of encountering the ending!

  • #147

    @playerafar: In response to your post #118:

     

    There is nothing wrong with your memory, but there is something wrong with my text editing. It was actually a post by Squod that stated the 10x10 idea and I copied too much of the post.

     

    You ask if the mate is possible on a 10x10 board if the king is in the centre. I think the answer is not necessarily, (This is why I said the position I gave would be drawn if the king positions were interchanged. In that case I think the black king could reach a position in the centre where White could not avoid a draw by repetition - or 50/75 move rule if taken into account). But to allow a mate by White, the Black king need be neither at the edge nor close to the "right" corner. E.g.

     

    null

    White wins if the Black king is in the coloured area (White to play)

    or red area (either side to play).

     (The area shown for the Black king above is by no means  exhaustive.)

     

    When I said I would guess that mate would be possible within the 50 move rule on a 10x10 board I was, of course, referring only to positions where mate would be possible in the first place. Even so after looking at it a bit closer I would now say I guessed wrong and the longest mate would probably be nearer 60 moves than 50.

     

    I will answer the remainder of you post shortly. This ties in with xman720's query on how to avoid ceding moves at the start of the endgame so I will make it a joint answer.  But the answer will necessarily be a little more comprehensive, so it will have to wait till I've moved house. 

  • #148

    Lol! - had to delete this comment - as it was WRONG -
    unfortunately - this forum doesn't accommodate a complete delete.
    Which much of V3 does.

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