Simple mates with fairy pieces

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tacticspotter

It just don't work...-_-

tacticspotter

like 

1.I suddenly became black

2.The pieces do random moves

3.The pieces don't move the way I want it to

4.King can touch king

5.I can skip a turn by clicking king then the piece then the king then the piece

6.A king can take a king

7.After taking a king the kings self destruct

8. what is mate in 501?

9.mate in 509?

and others

HGMuller

Ah, you just don't like the way it is designed to work...

  1. You never 'suddenly become black', because you are never white in the first place. You can move for any color at any time, and the computer than just makes the best move for the other player. This is explained in the text above the diagram.
  2. You have to be still more specific on that. The only moves pieces should do is those you indicate with the mouse, or the best move for the other side in the position this creates.
  3. You mean the pieces you click does not move to the square that you click? I have never seen that.
  4. Yeah, so what? Not every chess variant has a checking rule, and since moving into check means an immediate loss because your King will get captured, you better not do that... The applet would never be so stupid to do that...
  5. There you have a point. It should not move when you merely select a new piece.
  6. You could not take the King by a legal move; it would never expose its King to check.
  7. Well, if you do illegal moves, you are on you r own. If you would do that agains a human opponat he probably would also break the board over your head.
  8. There you have another point; it really should say "draw" in those cases, rather than interpret the internal EGT code for 'undecided' as a mating distance.

I will fix 5 and 8/9

tacticspotter

also how did pieces "fly" to any square?

HGMuller

Because you moved it there? (Just guessing, as I cannot see what you are doing...)

tacticspotter

No I mean how can a piece go to any square on the board?

HGMuller

You click the piece, and then you click the square where you want it to go. Or you press the mouse button while over the piece, keep it presssed while you drag it to the square you want it to go, and release the button there.

Anyway, I changed the message it displays when there is no forced mate to say 'draw'. And you can now also change your selection of white piece without triggering a black move.

icositetrachoron

Where can I play chess with these "fairy pieces"?

HGMuller

I upgraded the checkmating applet a bit; You can now also select larger boards, and boards of different shapes. Amongst which the 4-player board.

tacticspotter
icositetrachoron 写道:

Where can I play chess with these "fairy pieces"?

ummmm 4 player chess

icositetrachoron
tacticspotter wrote:
icositetrachoron 写道:

Where can I play chess with these "fairy pieces"?

ummmm 4 player chess

But how?

NMMingyangzhang5910

magic

NMMingyangzhang5910

hi

 

yuzhijing
qfcbv wrote:

what about 2 wildebeests?

3 camels?

3 knights?

I played 2 wildebeests with comfuter, then checkmate.

Game link: https://www.chess.com/4-player-chess?g=4005694

HGMuller

Interesting: a single Wildebeest normally has no mating potential. Only helpmates are possible.

But the concave corners in the 4-player board actually do enable it to deliver checkmate. The square where it can do this would ly off board for a rectangular board.

 

The Knight above represents a Wildebeest, which forces the bare King into the corner with check. By moving to d0 it can then deliver checkmate, if d0 is on the board. On a rectangular board it would not be, and there are no mate-in-2 positions there.

So a single Wildebeest is already enough to force checkmate, in 4-player Chess. You can try it in the checkmating applet.

The same holds for a pair of Knights. These can also force checkmate in 4-player Chess. The 3-vs-1 checkmating applet cannot handle a full-size 4-player board, but on a 10x10 board with this type of corners it can demonstrate the technique for the final blow.

GVSK1728
vio44 wrote:
BoxJellyfishChess wrote:

2 Alibabas: https://www.chess.com/4-player-chess?g=3757945 I am very on the fence about this; the result of the game was that this is a very hard but possible mate without stupidity from the opponent, but I would appreciate a post confirming or rejecting this hypothesis. "

The above hypothesis is false because red can't force yellow to get out from the center of the table .

Wrong. All that is needed is a king and an alibaba to force yellow out using zugzwang. Use your brainmeh.png

dax00

I had hoped for a 3v1 checkmating applet. My first attempt underestimated the time necessary to produce an EGT for a 10×10 board. So I went back to the 8×8 for what I think is the most interesting 3v1 mate, king+met+khon vs king (makruk). It's a very tricky mate, especially with makruk's draw rule looming overhead. Surprisingly, the longest mate length required is 57 (!) moves. 

A couple notes: 1) I was unable to move the met onto the first rank. It kept saying to select a piece, while the met was already selected. Other pieces moved as expected. 2) Even with "stalemate is a win" selected, the enemy king played into stalemate.

HGMuller

As to (1), you are right! Thank you for spotting this. What happens is that, because the Met was defined as the first piece, the Diagram considered it a Pawn. So it wanted to promote it, and expected you to select a piece from the table to promote it to. I thought I had prevented that by configuring the diagram with promoZone=0. But apparently the diagram script does something fishy in that case, which I should check out: the 1st rank should never be considered a promotion zone for white. Anyway, I have now also specified maxPromote=0, (instead of the default 1), meaning that none of the piece types can promote, and this at least seems to work.

As to (2), are you sure you rebuilt the EGT after ticking "Stalemate is a win"? If so, what end-game, and do you still remember the position?

And yes, the time needed grows explosively with board size. On my (pretty fast) desktop KNNK on 10x10 takes 121 sec (against 8x8 18 sec). No idea how much it would take on a tablet or phone.

[Edit] The code I had added to force promotion when a Pawn reaches last rank, on behalf of Chu Shogi, was the cullprit; it did not check if that last rank was actually in the promotion zone.

tacticspotter
Aiden-1089 写道:
BoxJellyfishChess wrote:

You are probably thinking, "I know simple mates, they are easy! You can mate with Q and R and BB and BN but with nothing else." This is true, but with 20 different fairy pieces and a non-royal king, there are a lot more simple mates to analyze. Here are a few basic ones I did against a comfuter and the result:

Amazon: https://www.chess.com/4-player-chess?g=3757707 Easy Mate

Elephant: https://www.chess.com/4-player-chess?g=3757714 Easy Mate

Hawk: https://www.chess.com/4-player-chess?g=3757729 Mate

General: https://www.chess.com/4-player-chess?g=3757740 Mate

Wildebeest: https://www.chess.com/4-player-chess?g=3757754 No mate, unless the opponent blunders

2 Ferzes: https://www.chess.com/4-player-chess?g=3757802 No mate, unless the opponent blunders

2 Wazirs: https://www.chess.com/4-player-chess?g=3757833 No mate, unless the opponent blunders

Knight-Rider: https://www.chess.com/4-player-chess?g=3757870 Mate impossible

Camel-Rider: https://www.chess.com/4-player-chess?g=3757886 Mate impossible

Alibaba-Rider: https://www.chess.com/4-player-chess?g=3757907 Mate impossible

2 Alfils: https://www.chess.com/4-player-chess?g=3757916 No mate, unless the opponent blunders (note: the mate with 2 Dabbabas is not covered because it is very similar to 2 Alfils.)

2 Alibabas: https://www.chess.com/4-player-chess?g=3757945 I am very on the fence about this; the result of the game was that this is a very hard but possible mate without stupidity from the opponent, but I would appreciate a post confirming or rejecting this hypothesis.

2 Camels: https://www.chess.com/4-player-chess?g=3757962 No mate, unless the opponent blunders

Finally, I know that the king is not a fairy piece, but you probably have not learned how to mate with 1 royal and 1 non-royal king because normal chess does not have promotion to kings. So:

King: https://www.chess.com/4-player-chess?g=3758006 Mate

 

Post if you got a different result in a game or if you want to add a different basic mate. Here are the rules for new basic mates:

1. Let's call the set of all your pieces in the mate P. If it has been proven possible that a subset of P can also be used to mate, your mate has redundant pieces and therefore should not be posted.

2. Easy mate < 15 moves, very hard mate requires a lot of thought or takes close to 50 moves. Anything in between is just mate.

3. If you achieve mate, check to see if the opponent could have escaped mate easily somewhere during the game (especially if you are playing against a comfuter or a randobot).

 

 

I think you should mention the colours of the alibabas because, like bishops, they can only stay on one colour.

He mean no matter what color of course 

HGMuller

According to the 3-vs-1 checkmating applet, two Alibabas in general is a draw. On 8x8 only 0.2% of all positions with the weak side to move are lost. This happens when the bare King is already trapped in a corner by the enemy King and one Alibaba. That it can take many moves is just because it takes time to approach with the other Alibaba. When the Alibabas are of the same shade, no mate is possible at all, of course.