Puzzle Description:

King, bishop and knight against king is the trickiest practical endgame checkmate in chess. It requires you to pin your opponent into the same-color corner as your bishop. But first you have to force them into the opposite-color corner. There's a tightrope to walk to make sure the lone king stays trapped on or near the edge once he's in the corner. If you do it wrong, the 50-move rule comes into play, and the game is drawn. There are other final mating positions, but this is the main one.

#1: Ailsa Hebert (bazette3) on Jun 6, 2021

I was expecting to have to do some guessing or whatever but it was very easily solvable.

Cool concept, though the knight kinda looks like a vulture.
Agree with #1 - warning in title was unnecessary. Perhaps change it to something related to the name of this scenario?

I like the title! When it became obvious that there was no edge logic required in the image, I was eager to find out what sort of "edge" logic would be in the description. :)

Intricate logic for the move! Cool!

Misdirection in your WebPBN title? It's more likely than you think!

I can see the green King holding Red king to the edge as it walks from Black corner square to White corner square, but what's the final move here? If green Knight stayed where it is pictured, Red King wouldn't be able to enter into 2nd-to-last Black square. The Bishop is the one mating, so that implies Green Kight and King were already in place. If instead Green Knight moved to its pace to check Red King from 2nd-to-last Black square, couldn't Red King move one right instead of one left? I'd love to see this dance play out.

Edit: I just watched this:
https://www.youtube.com/watch?v=hr8qV0iia8Y
Fascinating! The video I watched just prior had a different solution.

Fun solve. Great illustration. I actually guessed what it was about half the way through. That's unusual for me.

I was thinking how great I am that I don't even need edge logic to solve this. Oops! Consider me misdirected.

I'm with Kristen. Just a different kind of edge logic!

Goto next topic

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