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 Chess variants (8x8)

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17. October 2006, 07:15:26
Walter Montego 
Subject: Re: ULTIMA is a very good 40 year old chess variant
Ray Garrison: Yes, I'd like to see Ultima here. The original rules with unlimited movement is how I like to play it. I learned the game with Abbott's updated rules from the late sixties and those of us that played the game threw out the restricted move version and without realizing it re-invented the first version of Ultima. The first version is the one that got popular. It's a fun game, and you have to watch out for the dread Immobilizer. It'd take me a few games to remember the plans and play as it's been many years since I last played Ultima.

17. October 2006, 06:59:26
Ray Garrison 
Subject: ULTIMA is a very good 40 year old chess variant
Ultima is a very good chess variant that was invented by Abbott in the early 1960s. It is has been one of my favourite variants of the past two decades. I would love to see the game at this site, possibly with a tweak or two in the rules. I have some very good suggestions as to minor rule changes, having played hundreds of games of this variety. Is anyone else interested in seeing ULTIMA at brainking.com?

9. October 2006, 17:16:39
joshi tm 
Subject: Re: Extinction Chess
Walter Montego: That would be even better indeed.

9. October 2006, 13:31:08
Walter Montego 
Subject: Re: Extinction Chess
joshi tm: I like the border as it is. The name of the type of game that you're playing is right next to the border.

Why not have it so each of us can choose the color of the border that we want for each game? Just like how we can choose the size of the pieces or the type of them in some games, such as Shogi?

6. October 2006, 11:03:16
joshi tm 
Subject: Extinction Chess
I know it was asked, I know it came, and I know is was gone due to the ugly (inhuman) color, but please Can there be another border for Extinction Chess? Please, In Ext. Chess I play moves I would never do in regular Chess, and vice-versa.

5. October 2006, 12:30:46
WhisperzQ 
Subject: Re:
Cubs93: You are talking about random screen chess games ... yes?

4. October 2006, 19:05:28
Cubs93 
I'll do that :-)

4. October 2006, 16:23:24
grenv 
Subject: Re:
Cubs93: There's a rule that capturing the king is a draw????????? Surely you jest.

Perhaps if you posted the game position we could help. And in future don't play hidden games.

4. October 2006, 16:16:46
Cubs93 
ah, forget about it... i can't explain it any better, it's just a rule of the FIDE, the world chess organisation

3. October 2006, 17:59:45
grenv 
Subject: Re:
Cubs93: I still don't understand why capturing the king would be considered a draw.

3. October 2006, 17:46:51
Cubs93 
in a real life game a draw means: if you are playing real, so you can see your opponent...

2. October 2006, 21:03:22
grenv 
Subject: Re: look this
Cubs93: What does "in a real life game a draw" mean? Surely losing your king is either not allowed (can't move into check) or a loss (e.g. in Dark Chess). But never a draw??

I've never played crazy screen chess, but I assume from the rules is is possible that black starts in check, therefore the code probably has to allow for it, which means having your king captured would be a loss?

2. October 2006, 20:44:43
Walter Montego 
Subject: Re: look this
Cubs93: I would take a look at it, but you have the game as private. One of many reasons not to do so.

Fencer might be able to help you out.

2. October 2006, 20:13:48
Cubs93 
Subject: look this
Scherm Schaken (qik_ - Cubs93) my king is captured. that can't... then it's in a real life game a draw. but brainking said i lost. why???

18. September 2006, 16:07:20
Beren the 32nd 
Subject: The big match
The Topalov vs Kramnik world championship match is starting soon, see
http://www.chessbase.com/newsdetail.asp?newsid=3349

Any predictions? I just hope that Kramnik's health stays intact, so that it will be a fair contest. If both players are on top form I think it could be the highest quality match ever. It is a shame there will be only 12 games though.

15. September 2006, 07:22:03
jannix 
Subject: New tournament of the fellowship "Oriental games"
You are cordially invited to join the new tournament of the fellowship "Oriental games" opened to all.
The supported games are:
Chess, Chinese Chess, Japanese Chess, Loop chess, Ambiguous Chess, Reversi 8x8, Go, Go 9x9 and Go 13x13.
You can be registered to the adress:
Oriental Games (15. Septembre 2006, 06:56:47)

14. September 2006, 01:57:45
inpassant 
Subject: Re: fischer random - castling
plume: You are welcome.

14. September 2006, 00:35:05
kodiak 
Subject: Re: fischer random - castling
naughtypawn: Thanks naughtypawn. This is my first game of Fischer Random so I just wanted to try the castling to see where the King would end up. Good info in your post --- I am a beginner at Chess so I have alot to learn.
Thanks

13. September 2006, 19:40:27
inpassant 
Subject: Re: fischer random - castling
Modified by inpassant (13. September 2006, 19:41:44)
plume: You can´t castle right now. You need to move your bishop and your knight to do a h-castle (your king will be on b and your rook on f). And to do an a-castle, you need to move at least your rook that stays on d. Or... you have a castle already (king on c and rook on d) ;)

13. September 2006, 19:14:17
kodiak 
Subject: fischer random - castling
http://brainking.com/en/ShowGame?g=1918631
In this game shouldn't either player be able to castle now or even as the first move? the computer won't let me move the king yet. I use webTv ---not sure if that makes a difference.
Thanks

3. September 2006, 16:54:10
goodfoods 
Subject: Re: Atomic Chess teams
Marfitalu: i have but that's the problem, there are not enough teams out there the Wombats have disappeared and there are only 4 other teams

27. August 2006, 16:40:47
goodfoods 
Subject: Atomic Chess teams
where are all of the Atomic Chess teams from fellowships we need more competion

23. August 2006, 18:42:38
Bwild 
Subject: Fast Legan Tourny

14. July 2006, 17:26:22
Fencer 
Subject: Re: Bug in ambigious chess
BlueJ: A move must be finished by marking a square for your own piece.

13. July 2006, 18:08:38
Horseman 
Subject: What about this variant?

13. July 2006, 14:41:16
BlueJ 
Subject: Bug in ambigious chess
I already let Fencer to know this bug. But FYI also.

When opponent piece is about to be promoted, I can select pawn, I can select the piece that it will be promoted to. But then I can not finish my move. J

12. July 2006, 21:18:20
Anencephal 
Subject: Re:
Chicago Bulls:The program(Scid) has nice graphics for itself. I was lazy so didn't upload them or didn't modify the produced file to do your suggested trick. It's the normal start position.

chess database programs does a fine enough job with ambiguous chess

12. July 2006, 13:30:27
Chicago Bulls 
Modified by Chicago Bulls (12. July 2006, 13:31:20)
Oh OK. And one note: The pieces from the site http://h1.ripway.com/sanjaab/bitmaps/ do not appear at all, so in the page you provided for Ambiguous Chess statistics i can't see a board with pieces. I suggest you to put the pieces from the following site(do not click it as nothing will happen):
http://www.marochess.de/php/chesspieces/

And you can choose the desired piece to include in your code for the board position with the following way:
After http://www.marochess.de/php/chesspieces/
put CPn.gif
With:
C = W or B for white or black color piece
P = Q or K or R or B or N or P for Queen or King or Rook or Bishop or Knight or Pawn.
n = a number from 1 to 8 for each piece set that matches your size of the board. Of course if you use 1 for example for black rook then you will have to use n=1 for all other pieces too.....
n=1 is a good choice by the way.....

For example http://www.marochess.de/php/chesspieces/WQ1.gif produces the image of the white Queen from set 1.

12. July 2006, 05:20:09
Anencephal 
Subject: Re:
Chicago Bulls: Sorry, it's generated by a filter to just include the games of 10 current top rated(provisional or stablished) ambigous chess players on this site.
just 159 games and 51 are nabla's games

11. July 2006, 21:56:23
Chicago Bulls 
And where exactly are the top 10 Ambiguous players in that page? LOL!

11. July 2006, 17:55:07
Anencephal 
For statistics lovers:

Top 10 ambiguous players

All


7. July 2006, 15:20:10
nabla 
Subject: Re: Ambiguous Chess- Brainking games until now, opening probabilities.
Chicago Bulls: OK I understand, I suppose that this has be done for chess openings database, but I had never seen it before. Now, it seems clear that it requires a great number of high-level games, and I don't think that we have either of these in Ambiguous Chess yet.

7. July 2006, 13:37:24
Chicago Bulls 
Subject: Re: Ambiguous Chess- Brainking games until now, opening probabilities.
Modified by Chicago Bulls (7. July 2006, 13:42:28)
nabla:
It's simple:
Take for example the line after After 1.d4 d5:
2.c4 games played = 30, Percentage wins = 93%
2.f4 games played = 6, Percentage wins = 50%

It is not clear at all that 2.c4 is the better move here. You will say but why? It has won for white in the 93% of the games! A huge difference over 2.f4 that wins on only 50%. But this may be completely deceiving.

Consider for example that after 2.c4 and for simplicity's sake, that there are 2 responses to this:
2...X1 that has been played 26 times with a devastating score of 95% in favour of white and 2...X2 that has been played 4 times with a bad score for white of 25%.
2...X1 was the move all people played some time ago, until the new move 2...X2 discovered and been played with a good success for black.
That means we possibly have a refutation to 2.c4 since 2...X2 brings good results for black! Although statistics say 2.c4 has a good %, since many games were played with the bad response for black 2...X1.

The bad thing is the refutation may be deep in the openings-data tree or there may be another refutation to the 2...X2 move later in the tree so 2.c4 is good after all! To solve all these a complete examination of the whole opening-tree should be done starting from the leaves of the tree and going up all the time until we end to the starting opening moves. In that way going backwards(that's the meaning of backsolving) we find the best value(+-,-+, ++-, --+,etc) of each node.....

7. July 2006, 11:43:53
dameningen 
Subject: Re: Ambiguous Chess- Brainking games until now, opening probabilities.
Modified by dameningen (7. July 2006, 11:44:17)
nabla: Myabe something like BKR averange of players who used this move and their performance BKR. If you look these too you could at least tell something.

7. July 2006, 11:13:25
nabla 
Subject: Re: Ambiguous Chess- Brainking games until now, opening probabilities.
Chicago Bulls: Thank you for this work !
What is backsolving ? How would it tell which moves are better ?

6. July 2006, 14:30:59
Chicago Bulls 
Modified by Chicago Bulls (6. July 2006, 14:31:33)
Note that these statistics should not confuse us about what is better to play or not. I mean that after 1.d4 d5 for example, when we see 2.c4 with a win=93% while with 2.f4 with a win=50%, we should not been deceived and believe that 2.c4 is much better or even better! This may not be the case! In order to know for sure a backsolving procedure should be done.... But i don't have right now time for this. Later....

6. July 2006, 00:26:10
Chicago Bulls 
Subject: Re: Ambiguous Chess- Brainking games until now, opening probabilities.
nabla: .
.
.
Yes unfortunately i didn't know that when i downloaded all the Ambiguous Chess games those currently played was included too....But after a clearance and a re-generation we have these:

For example:
After 1.e4
1...e5 Win%=44 means that black has a score of 44% against white when he plays 1...e5

Starting move
Move Games Win%
1.e4      321      45
1.d4      114     61
1.f4         70     53
1.c4        66     64

After 1.e4
Move Games Win%
1...e5    125      42
1...c5     74       66
1...d5     49      71
1...e6     36      62


After 1.d4
Move Games Win%
1...d5     61      31
1...e6    17       55
1...f5     13       61
1...c5      9       50

After 1.e4 e5
Move Games Win%
2.c4       24       70
2.d4      23        63
2.Qh5   17        58
2.c3      13        38



After 1.e4 c5
Move Games Win%
2.Bb5     15       60
2.c4        10      40
2.d4         6       33
2.b3         6       16
2.c3         6         8

After 1.e4 d5
Move Games Win%
2.exd5    25       24
2.e5         8        75

After 1.e4 e6
Move Games Win%
2.d4      22        36
2.c3       5         40



After 1.d4 d5
Move Games Win%
2.c4      30       93
2.f4        6        50
2.e4       5        60
2.g3       5        40

After 1.d4 f5
Move Games Win%
2.c4        6        33
2.Bg5      2        50


After 1.d4 e6
Move Games Win%
2.e4         7        42
2.Nc3      3        50
2.g3         3        33

5. July 2006, 20:48:18
nabla 
Subject: Re: Ambiguous Chess- Brainking games until now, opening probabilities.
Chicago Bulls: That is very nice, good job ! But the numbers make me suspect that you counted unfinished games as draws, because at the moment I write this message the counters show only 726 finished games.

5. July 2006, 18:37:42
Chicago Bulls 
Subject: Ambiguous Chess- Brainking games until now, opening probabilities.
Modified by Chicago Bulls (5. July 2006, 18:39:41)
For example:
After 1.e4
1...e5 Win%=44 means that black has a score of 44% against white when he plays 1...e5




Starting move
Move  Games Win%
1.e4       634       47
1.d4       245       56
1.c4       144       58
1.f4        131       56


After 1.e4
Move   Games Win%
1...e5     255      44
1...c5     140      61
1...d5      85       65
1...e6      64       60


After 1.d4
Move   Games Win%
1...d5      123      36
1...f5         34      66
1...e6        31      54
1...c5       17       47



After 1.e4 e5
Move   Games Win%
2.c4         50      66
2.d4        43       55
2.Qh5     30       60
2.c3        30       46



After 1.e4 c5
Move   Games Win%
2.Bb5     22        54
2.c4        21       40
2.d4       15        43
2.c3       12        25


After 1.e4 d5
Move   Games Win%
2.exd5     42        32
2.e5        14         64

After 1.e4 e6
Move   Games Win%
2.d4          34         36
2.c3            7         42



After 1.d4 d5
Move   Games Win%
2.c4         59         79
2.f4          11        45
2.e4           9        61


After 1.d4 f5
Move   Games Win%
2.c4         16        31
2.Bg5        6        41




4. July 2006, 19:57:56
grenv 
Subject: Re:
Chicago Bulls: It's not different at all, in fact why would anyone consider exd5???, it loses the game immediately. Why allow stupid mistakes?

4. July 2006, 17:49:36
nabla 
Subject: Re:
Chicago Bulls: I fully agree that my first suggested option would make the game less interesting because defence would superseed attack.

4. July 2006, 17:47:36
nabla 
Subject: Re:
Chicago Bulls: In your example, grenv would probably like 8.exd5 to be rejected by the system as illegal.

4. July 2006, 17:45:00
Chicago Bulls 
Subject: Re:
Modified by Chicago Bulls (4. July 2006, 17:51:27)
grenv: So you say that in Atomic Chess 8.exd5 should not be allowed for white or even worse 8...Qxd2 with win, should not be allowed for black?

1. Nf3 f6 2. Nd4 Nh6 3. f3 c6 4. e3 d5 5. Nb5 cxb5 6. Bb5 Nc6 7. e4 Ng4 8.exd5 Qxd2 0-1

But that would just be another variation of Atomic Chess different than that we have here.....

4. July 2006, 17:44:39
nabla 
Subject: Re:
grenv: If my question wasn't, your answer was very clear :-)
Making moves that leave the king in check illegal is indeed an alternative formulation in my personal ruleset ( http://www.pion.ch/echecs/variante.php?jeu=ambigus&rubrique=regles&changer_langue=E ) . Basically it doesn't change the game at all (except for the stalemate, but I like the fact that stalemate is a win), has the advantage to cut off silly mistakes, to make the game more chess-like, but the disadvantages to make the rules more difficult to understand, three times as long and more difficult to implement.
The last reason is enough to make any programer prefer the simple no-check no-mate formulation, and even if I supported your proposition, I am sure that Fencer would not. He didn't implement checks in either Atomic Chess or Extinction Chess, and rightly so imho.

4. July 2006, 17:35:55
Chicago Bulls 
Subject: Re:
nabla: In the first case the game would be inferior i think, while in the second it's pointless since it's just a delay of the loss....

4. July 2006, 17:31:54
grenv 
Subject: Re:
nabla: I didn't really understand your question, but what I meant was that moves leaving the king in check should be illegal.

Atomic chess should be the same, except that "check" should mean any situation where I can blow up the king.

e.g.
1.Nf3 f6
2.Ne5+

or
1.Nf3 a6
2.Ne5x

4. July 2006, 17:08:23
nabla 
Subject: Re:
grenv: That is something that could be said about Atomic Chess by someone playing his first game, giving an orthodox check, and seeing his opponent answering by ignoring the check and blowing his king up !
Did you mean that one should disallow to choose a move leaving the opponent in check, or only redefine "checks" so as to avoid that a player can lose his king in one move (that is, making those moves illegal instead of losing) ?

4. July 2006, 17:03:28
dameningen 
Subject: Re:
grenv: I do not see the point neither why check and mate do not exist.

4. July 2006, 16:58:38
King Reza 
Subject: Re:
grenv: Knight Relay Chess is the game!

4. July 2006, 16:32:04
grenv 
I played ambiguous chess a few times, and I have to say i think introducing check would make it a better game. Either way it's pretty silly.

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