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You have been imprisoned by your super duper cliché evil king named Tim Goldsteen for sneezing during his birthday party. Apparently he’s that evil. Anyhow, you found out Tim’s secret that he enjoys chess and is a grandmaster. However you did that in jail. Not wanting his secret revealed, as the Chess Players Against Evil Grandmasters Society (WHY does that exist? I’m gonna kill whoever wrote this script for me!) was after him, Mr. Goldsteen came up with an idea.

Instead of reasonably stabbing you in the face or something right then and there, he offers to spare your life if you keep his secret. But first you must complete a challenge.

He tasks you with creating a game with the following conditions:

  1. It is white to move and checkmate
  2. Black must have 10 knights in the starting position. Your starting position is to be constructed by you.
  3. All of black’s moves must be knight moves. The black king cannot move at all, i.e. because it cannot, ever.
  4. All of black’s moves are forced, but variations are allowed to occur.
  5. At least 9 of the black knights must move. (I say this because this is the limit that I ran into. I congratulate you if you can get all ten!)
  6. The black king can be the only black piece left at the end of the game.
  7. It must be legal.
  8. FIDE laws of chess apply.
  9. Assume that black is playing optimally.
  10. I may or may not already have a solution.

You have 24 hours to complete the task before he comes back and stabs you in the face or something like he should have done earlier. He manically laughts as he slowly walks off to eat his dinner of turkey fries.

“Call it a not so knights challenge!” Tim Goldsteen yelled before he vanished from your range of hearing.

P.S. If you don’t understand what “variations are allowed to occur" means, see my answer to this CSE question: https://chess.stackexchange.com/questions/4963/longest-sequence-of-mutually-forced-moves/24148#24148

Basically, black must, by the laws of chess aka forced moves, take the checking white piece, but he has a few options on how to do so. All of his options are forced, no matter what route he takes.

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    $\begingroup$ "All of black’s moves are forced, but variations are allowed occur." Consequently, I presume that you are asking us to create a position, rather than a game? I mean, there aren't really any forced moves after any white move 1. $\endgroup$ – Brandon_J Apr 21 at 0:35
  • $\begingroup$ I am asking for a game. The starting position has to be constructed of course. $\endgroup$ – Rewan Demontay Apr 21 at 0:36
  • $\begingroup$ What do you think of my puzzle? It took me a couple of hours to construct a solution myself that was flawless. $\endgroup$ – Rewan Demontay Apr 21 at 0:39
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    $\begingroup$ Not bad. Not bad at all. $\endgroup$ – Brandon_J Apr 21 at 0:42
  • $\begingroup$ I’m enhancing my question with continuous edits to make sure that it’s understandable to outsiders. $\endgroup$ – Rewan Demontay Apr 21 at 0:51
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Here is a solution where the 10 knights move.

There is a little freedom at each move but not so much, so that it is very easy to check that it works regardless of which variation occurs.

FEN (starting position): nn1nQ3/nQ1Qn3/QR1RRRRR/n1kNn3/Qn1n4/2B5/n1N3B1/7K w - - 0 1

PGN: 1. Rbc6+ Na7xc6 2. Qdxc6+ Nb8xc6 3. Rxc6+ N8xc6 4. Qexc6+ N7xc6 5. Rxc6+ Nexc6 6. Rxc6+ Ndxc6 7. Rxc6+ Naxc6 8. Rxc6+ Nxc6 9. Bb4+ Naxb4 10. Qaxb4+ Nxb4 11. Ndxb4 Nc7 12. Qxc7# *

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    $\begingroup$ Post a PGN and a FEN please $\endgroup$ – Rewan Demontay Apr 21 at 12:48
  • $\begingroup$ Isn’t it kind of neat that we both hit upon similar tatics on how to use a dark-squared bishop? $\endgroup$ – Rewan Demontay Apr 21 at 21:32
  • $\begingroup$ @RewanDemontay I'm not sure what you mean, there are no bishops in your variation. $\endgroup$ – Arnaud Mortier Apr 21 at 21:46
  • $\begingroup$ Nevemind. I was thinking of a failed attempt of mine. $\endgroup$ – Rewan Demontay Apr 21 at 21:48
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Now that a solution has appeared, with 10 knights moving as I hoped, I shall share the 9 knights mover that I found.

[FEN: 1R1Qn1nR/3n1k1n/1n3n1Q/3nQKQn/3Qn1nQ/2Q5/1Q6/Q7 w - - 0 1]

The Game: 1. Qexf6+ Ne4xf6 2. Q4xf6+ Nd5xf6 3. Qcxf6+ N4xf6 4. Qbxf6+ N5xf6 5. Qaxf6+ Nhxf6 6. Qgxf6+ Ngxf6 7. Q4xf6+ Nexf6 8. Qhxf6+ Nxf6 9. Rb7+ Nbd7 10. Rxd7+ Nxd7 11. Qxd7#

Link to game (Apronus)

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