11
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Following the rules created by Lord of dark in this puzzle, and used here also, the idea is to find the minimum number of consecutive white moves to checkmate all the black kings (in this case 12). You cannot make a move that would put white in check.

enter image description here

Here's an interactive board.

RULES

  • You are playing as White and you can make as many moves as you want before Black's turn.
  • During your moves you can take any black piece except kings.
  • During your moves your king can not be in check position.
  • At the end of your turn all the black kings must be check mate : if Black can make one move that ends with one king being safe, you don't win. Note that this one move can't be a king moving to a threatened position.
  • One piece can be used in multiple checkmates (you don't have to take all the king, just to checkmate them)
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  • $\begingroup$ How do you get pieces to promote properly with that interactive board? I just tried it, and a promoted pawn can move like a queen but still looks like a pawn. $\endgroup$ – Rand al'Thor Mar 18 '17 at 17:09
  • $\begingroup$ It's a bit manual! You just need to drag a queen onto it - it's two interactions. Flexibility vs convenience trade-off... $\endgroup$ – Dr Xorile Mar 18 '17 at 17:10
  • $\begingroup$ I make my animations by opening the link on my phone and taking screen shots there... $\endgroup$ – Dr Xorile Mar 18 '17 at 17:11
  • $\begingroup$ @randal'thor Actually, you can drag the pawn anywhere... $\endgroup$ – boboquack Mar 18 '17 at 22:08
4
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Thirteen moves:

  1. d x c8

  2. c x d8

  3. h x g8

  4. g x h8

  5. Q x b6

  6. Qc x c5

  7. Q x c4

  8. Q x c1

  9. Qc x b2

  10. Qg2

  11. Qg x b7

  12. Qh3

  13. Qh x b3

Here's an animated GIF of the solution. (Assume all promoted pawns become queens, since I couldn't figure out how to convert them automatically using this particular chess software.)

Thirteen-move supermate gif

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  • 7
    $\begingroup$ This doesn't checkmate all the kings: black can take a queen (any of them) with one of the knights, after which some kings will no longer be in check. $\endgroup$ – hvd Mar 18 '17 at 18:20
2
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I've done it in 18 moves, one pawn at a time:

Solution:

Too many Knights

Moves:

H pawn:

1. hxg8=N, Nf6, Ne4, Nc3

G pawn:

5. gxf8, Ne6, Nd4, Nc2

C pawn:

9. cxd8, Nc6

F pawn:

11. Fxe8, Nf6, Nfd5

E pawn:

14. e8=N, Nc7

D pawn:

16. d8=N, Nde6, Ned4

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  • $\begingroup$ This was more what I was aiming for, but the queens do a better job. $\endgroup$ – Dr Xorile Mar 22 '17 at 22:52
1
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Found it in 11, probably the optimal.

C pawn takes D8 and B6 - 2 moves

.

D pawn takes C8 and B7 - 2 moves

.

E pawn takes F8 and C5. Then waits a bit. - 2 moves

.

F pawn takes G1, C4 and B3. - 3 moves

.

E pawn now takes C1 and B2. - 2 moves

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