Author Topic: 3-Piece Musketeer Chess Endgame Tablebases Solved  (Read 369 times)

GothicChessInventor

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Re: 3-Piece Musketeer Chess Endgame Tablebases Solved
« Reply #45 on: February 06, 2018, 08:16:25 pm »
1. Lf7 Kd7
2. Kb7 Ke7
3. Le5 Ke6
4. Lc4 Kf5
5. Kc6 Ke4
6. Kc5 Kf4
7. Kd4 Kf5
8. Le5 Ke6
9. Ke4 Ke7
10. Kd5 Ke8
11. Kd6

Mate in 7

So has this exercise been helpful to you at all?

You have not made a single error according to the tablebases.
« Last Edit: February 09, 2018, 09:09:37 pm by GothicChessInventor »

ebinola

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Re: 3-Piece Musketeer Chess Endgame Tablebases Solved
« Reply #46 on: February 07, 2018, 12:08:47 pm »
It's shown me that it's possible to checkmate with a leopard. And the leopard endgame is the last basic endgame I need for this article.

12. ... Kd8
Chess player, amateur writer and on the side shitposter extraordinaire.

GothicChessInventor

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Re: 3-Piece Musketeer Chess Endgame Tablebases Solved
« Reply #47 on: February 07, 2018, 02:29:48 pm »
It's shown me that it's possible to checkmate with a leopard. And the leopard endgame is the last basic endgame I need for this article.

OK, sounds good. If you are publishing, you can cite the Planchet program written by Ed Trice as the source for the tablebase play. If you have any other questions you can reach me here and I would be happy to help.

1. Lf7 Kd7
2. Kb7 Ke7
3. Le5 Ke6
4. Lc4 Kf5
5. Kc6 Ke4
6. Kc5 Kf4
7. Kd4 Kf5
8. Le5 Ke6
9. Ke4 Ke7
10. Kd5 Ke8
11. Kd6 Kd8
12. Lf7

Mate in 6



« Last Edit: February 09, 2018, 09:10:03 pm by GothicChessInventor »

ebinola

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Re: 3-Piece Musketeer Chess Endgame Tablebases Solved
« Reply #48 on: February 07, 2018, 02:36:11 pm »
OK, sounds good. If you are publishing, you can cite the Planchet program written by Ed Trice as the source for the tablebase play.

No worries. Once this is done and dusted I'll be sure to give credit.

13. ... Kc8
Chess player, amateur writer and on the side shitposter extraordinaire.

GothicChessInventor

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Re: 3-Piece Musketeer Chess Endgame Tablebases Solved
« Reply #49 on: February 07, 2018, 04:15:16 pm »
1. Lf7 Kd7
2. Kb7 Ke7
3. Le5 Ke6
4. Lc4 Kf5
5. Kc6 Ke4
6. Kc5 Kf4
7. Kd4 Kf5
8. Le5 Ke6
9. Ke4 Ke7
10. Kd5 Ke8
11. Kd6 Kd8
12. Lf7 Kc8
13. Kc6

Mate in 5

Sorry for no diagram this time, the forum is full and can't handle any more uploads.
« Last Edit: February 09, 2018, 09:10:22 pm by GothicChessInventor »

HGMuller

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Re: 3-Piece Musketeer Chess Endgame Tablebases Solved
« Reply #50 on: February 08, 2018, 04:00:05 am »
As your diagrams are just screenshots of ascii text, you might as well copy-paste that ascii text directly into the posting (and set the font face to Courier for monospacing).

Too bad that my pleas for equipping this forum with interactive diagrams are met with deafening silence.

ebinola

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Re: 3-Piece Musketeer Chess Endgame Tablebases Solved
« Reply #51 on: February 08, 2018, 01:26:37 pm »
14.... Kb8
Chess player, amateur writer and on the side shitposter extraordinaire.

GothicChessInventor

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Re: 3-Piece Musketeer Chess Endgame Tablebases Solved
« Reply #52 on: February 08, 2018, 07:07:49 pm »
1. Lf7 Kd7
2. Kb7 Ke7
3. Le5 Ke6
4. Lc4 Kf5
5. Kc6 Ke4
6. Kc5 Kf4
7. Kd4 Kf5
8. Le5 Ke6
9. Ke4 Ke7
10. Kd5 Ke8
11. Kd6 Kd8
12. Lf7 Kc8
13. Kc6 Kb8
14. Kb6

Mate in 4

Code: [Select]
8  . k . . . . . .
7  . . . . . L . .
6  . K . . . . . .
5  . . . . . . . .
4  . . . . . . . .
3  . . . . . . . .
2  . . . . . . . .
1  . . . . . . . .

   a b c d e f g h

As your diagrams are just screenshots of ascii text, you might as well copy-paste that ascii text directly into the posting (and set the font face to Courier for monospacing).

Good idea H.G.! Thanks.
« Last Edit: February 09, 2018, 09:10:47 pm by GothicChessInventor »

ebinola

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Re: 3-Piece Musketeer Chess Endgame Tablebases Solved
« Reply #53 on: February 09, 2018, 12:14:17 pm »
15. ... Kc8
Chess player, amateur writer and on the side shitposter extraordinaire.

HGMuller

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Re: 3-Piece Musketeer Chess Endgame Tablebases Solved
« Reply #54 on: February 09, 2018, 02:33:39 pm »
Well, by now it should be obvious how to force the mate with checks at e6, d7 and c6.

Interesting to know is that this 16-move 'Leopard' is actually overkill for this purpose. Usually having 12 moves is already sufficient to equip a short-range leaper with mating potential, except in cases where it is obvious that no mate positions exist because no pair of orthogonally adjacent squares is attacked. And indeed, any of the groups of four rotationally equivalent moves can be removed from the Leopard, and it would still be able to force a mate against a bare King (on 8x8). That holds for the diagonal moves of length 1 and 2, but also if you remove 4 of the 8 Knight jumps (to leave a chiral piece).

GothicChessInventor

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Re: 3-Piece Musketeer Chess Endgame Tablebases Solved
« Reply #55 on: February 09, 2018, 08:50:42 pm »
Mate in 3

1. Lf7 Kd7
2. Kb7 Ke7
3. Le5 Ke6
4. Lc4 Kf5
5. Kc6 Ke4
6. Kc5 Kf4
7. Kd4 Kf5
8. Le5 Ke6
9. Ke4 Ke7
10. Kd5 Ke8
11. Kd6 Kd8
12. Lf7 Kc8
13. Kc6 Kb8
14. Kb6 Kc8
15. Le6

Code: [Select]
8  . . k . . . . .
7  . . . . . . . .
6  . K . . L . . .
5  . . . . . . . .
4  . . . . . . . .
3  . . . . . . . .
2  . . . . . . . .
1  . . . . . . . .

   a b c d e f g h

Mate in 2

15...Kb8 is a forced move
16. Ka6

Code: [Select]
8  . k . . . . . .
7  . . . . . . . .
6  K . . . L . . .
5  . . . . . . . .
4  . . . . . . . .
3  . . . . . . . .
2  . . . . . . . .
1  . . . . . . . .

   a b c d e f g h

Mate in 1

16...Ka8 is a forced move
17. Lc7 checkmate


Code: [Select]
8  k . . . . . . .
7  . . L . . . . .
6  K . . . . . . .
5  . . . . . . . .
4  . . . . . . . .
3  . . . . . . . .
2  . . . . . . . .
1  . . . . . . . .

   a b c d e f g h
« Last Edit: February 09, 2018, 09:11:47 pm by GothicChessInventor »

GothicChessInventor

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Re: 3-Piece Musketeer Chess Endgame Tablebases Solved
« Reply #56 on: February 09, 2018, 08:56:03 pm »
Well, by now it should be obvious how to force the mate with checks at e6, d7 and c6.

Interesting to know is that this 16-move 'Leopard' is actually overkill for this purpose. Usually having 12 moves is already sufficient to equip a short-range leaper with mating potential, except in cases where it is obvious that no mate positions exist because no pair of orthogonally adjacent squares is attacked. And indeed, any of the groups of four rotationally equivalent moves can be removed from the Leopard, and it would still be able to force a mate against a bare King (on 8x8). That holds for the diagonal moves of length 1 and 2, but also if you remove 4 of the 8 Knight jumps (to leave a chiral piece).

H.G., this was a test of my tablebases. Recall you helped me locate one bug in my move generator. Well, this is a similar experiment to be carried out. I don't think anyone should comment on games in progress, although there was clearly no harm done here because it is just a program playing against someone interested in observing the mating technique for this unusual piece.

HGMuller

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Re: 3-Piece Musketeer Chess Endgame Tablebases Solved
« Reply #57 on: February 10, 2018, 03:34:55 am »
Sure, I wouldn't have said anything if all the Human moves would not have been forced. Commenting on games is only considered a sin if the players can hear you, and computers can't.

GothicChessInventor

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Re: 3-Piece Musketeer Chess Endgame Tablebases Solved
« Reply #58 on: February 11, 2018, 02:17:55 pm »
Sure, I wouldn't have said anything if all the Human moves would not have been forced. Commenting on games is only considered a sin if the players can hear you, and computers can't.

A sin, lol. Would you have to say it in confession?

"Bless me father, for I have sinned. I told an entire discussion board that black was to be mated in 2 moves by a Leopard."

:)