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Backgammon and variants.

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9. juuni 2012, 12:30:08
pedestrian 
Teema: Re: Known and neglected for years?
speachless: If the problem is that some image files are missing, then old games will look wrong when we play through them today. That doesn't mean they were affected when they were played.

8. juuni 2012, 20:47:29
pedestrian 
Teema: Re: plakoto backgammon errors
Marshmud: I have the same problem as speachless. Just to clarify, let's take speachless' first example.

In this position: Plakoto (speachless vs. Luciano672) What pieces do yo see on the 9-point?

And in this position: Plakoto (speachless vs. Luciano672) which is one move later in the same game, what pieces do you now see on the 9-point?

In the first case, I see one white piece and nothing else. In the second case, I see one black piece and nothing else - but what I should see was a black piece pinning a white piece.

17. mai 2012, 06:42:16
pedestrian 
Teema: Re:
pgt: Look at the game ID in that message: 5710553 is in fact the game ID of game 4 in that match. So the message that you quote is not the message for the final game, it's the message for game 4.

Game 4 (game ID 5710553) was finished 16. May 2012 00:14:57 (server time). I suppose that corresponds to the date in the message, which is 16. May 2012 11:14:57. Do you live 11 time zones away from Prague?

Game 6, the last game of the match (game ID 5713004) was finished 16. May 2012 01:17:49 (server time). You lost that game and the match. You can see it in your completed games under "lost games", it's number two from the top at the moment. 


17. mai 2012, 05:58:04
pedestrian 
Teema: Re:
pgt: The game you link to is game four of the match. You won that game, but your opponent won the match.

27. märts 2011, 21:09:08
pedestrian 
Teema: Re: Identical Opening Moves

30. november 2010, 22:19:06
pedestrian 
Teema: Re: Points
pgt: Well, there is a way to verify it: You go to the message you received when you finished your next Hyper Backgammon game after this one. The rating calculations there should say that your initial rating was 2264.

30. november 2010, 22:04:36
pedestrian 
Teema: Re: Points
pgt: Hmm... that must be a bug. You should file a bug report if you haven't done it already (go to the message and then click the image of a bug in the upper right corner).

I don't know if Fencer still looks into those. In recent years he's been busy with BrainKing3.

30. november 2010, 15:49:27
pedestrian 
Teema: Re: Points
pgt: The link you provide doesn't show the rating change after this match. You should receive a message (under 'Events') that shows that your rating went up and his went down. If not, it seems to be a bug.

2. mai 2010, 10:15:01
pedestrian 
Teema: Re: Most games are begin with same rolling dice numbers..
grenv: We can only speculate about the cause of the problem, since we didn't write the code.

If we are to speculate, one possible hypothesis could be that some unintended event prevents the dice from being generated in the normal way. Whenever this event happens, you get the same dice as the previous roll. When it doesn't happen, you get a random roll. We must assume that this hypothetical event would be something that happens at the second player's first roll - but again, this observation is only useful to someone who has access to the code.

As an aside, if this hypothesis is correct, the event seems to happen in roughly 1 out of 3 games.


1. mai 2010, 18:45:22
pedestrian 
Teema: Re: Most games are begin with same rolling dice numbers..
Thom27: That's a great initiative! It seems clear that it is actually a bug and should be repaired as soon as possible. I wonder if it would be possible for your program to analyze a larger sample of games?

10. aprill 2010, 18:58:45
pedestrian 
Teema: Re:
Nothingness: The point you may be missing is that you only resign the current game, not the entire match. In your example, resigning would mean that you only lead by 4-1 instead of 4-0. Accepting would mean that the current game counts for two.

4. november 2009, 08:08:47
pedestrian 
Teema: Re: Bias
grenv: Just checked my plakoto games from 2009. It's 10 cases of identical first rolls out of 27.

Another observation is that there are very few instances of both dice being different, e.g. 56, 43. I think the expected frequency of this would be 4 out of 9, but in the above sample it's only 5 out of 27. In playBunny's first sample, it is 0 out of 12. And in playBunny's second sample (the "reasonable" one), I count only 3 rolls out of 38 where both dice are apart.

Well... if I'm paranoid, at least I'm not the only one.

4. november 2009, 01:25:58
pedestrian 
Teema: Re: Bias
alanback: I just checked a small, random sample of games: the 13 games (or matches) of regular Backgammon played by alanback in 2009. Out of these 13, 6 games start with identical rolls by black and white.

I know, it's hardly conclusive. But still interesting.

3. november 2009, 23:23:58
pedestrian 
I can only speak for myself, but no, I've got no statistics.

I wouldn't have suspected there could be such a problem, so I haven't especially been looking out for it. Even so, the tendency in my games has been obvious at times (several games in a row).

Now I learn that at least three other people have observed the exact same phenomenon. Sounds to me like it might be worth an investigation.

3. november 2009, 20:04:43
pedestrian 
Teema: Re: Most games are begin with same rolling dice numbers..
Pedro Martínez: Definitely not a coincidence - if it's anything, it's a lot of coincidences!
I noticed it too.

9. september 2009, 21:40:56
pedestrian 
Teema: Re: I want to cheat!
skipinnz: Thanks for the advice. Actually, luck is what I used in this game where I was 'caught' as a 'cheater', so I guess it's not effective if you want to do it secretly. Apparently, he believed I was using a program. I don't understand how a program would help you be lucky...

9. september 2009, 20:41:07
pedestrian 
Teema: I want to cheat!
Does anyone know a way to cheat in crowded backgammon? I've just been accused of cheating, and if I'm going to be blamed for it, I want to have the pleasure of committing the crime as well.

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