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F.A.Q.

  • Frequently asked questions
  • FAQ
  • Galaxy rating
  • rating
  • titles
  • error rate
  • equity
  • help
June 4 2020Backgammon Galaxy

Frequently asked questions

My game is lagging a bit when I try to confirm the dice, what can I do?

Most likely it is because you have multiple instances open of the same match. Always make sure, that you only have one window open, when you are using a web application! If this doesn’t help, then it’s probably your internet connection that is very weak or unstable.

How is the error rate calculated?

The error rate is calculated as the total equity loss divided by the total number of decisions, and then multiplied by -500. The analysis calculates the equity loss at every move, compared to the best move, and aggregates them. A “decision” is defined as an action, where there is an equity difference between at least two actions. So if it’s a forced move, a “dance” on the bar or a move where you have either 100% or 0% winning chances regardless, then it’s not considered a decision. If a doubling decision is with 0.200 in equity, then it’s considered a decision. A take/pass decision is always considered a decision.

How is the Galaxy Rating calculated?

We are using a standard ELO rating formula, but include a variable for the match length as well. To win Galaxy Rating points, you must win both the match AND the “skill battle”, which is decided by who has the lower error rate. Otherwise it’s a rating draw. This introduces a lot more skill into the rating system, and the system looks more like a chess rating system than the backgammon rating systems of the past.

Why am I not getting any rating points if I win a match?

Because to win Galaxy Rating points, you must win both the match AND the “skill battle”, which is decided by who has the lower error rate. Otherwise it’s a rating draw. This introduces a lot more skill into the rating system, and the system looks more like a chess rating system than the backgammon rating systems of the past.

What analysis settings is used on BackgammonGalaxy.com?

For Free- and Tourney Members the Extremegammon2 analysis setting is 2-ply on all decisions, checkerplay and cube. We call this the “Light analysis”. For Analysis- and Combo Members, we call this “Galactic analysis”: Checkerplay: 1st pass 3-ply, if error or blunder then 4-ply. Cube decisions: 1st pass 4-ply, if error or blunder then XG+.

All search intervals are set to “Normal”, since we didn’t measure any significant difference in PR averages between having a “Normal” and “Huge” search space, when we compared on a sample of matches analyzed with the deepest possible XG++ settings with Huge search interval.

The match equity table is set to Kazaross XG2.

What analysis settings are used, when a Free- or Tourney Member plays against an Analysis- or Combo Member?

Then both players will be analyzed using “Galactic analysis”.

How do I chat when I am playing?

You click on your avatar. Chat messages are like tweets, they will only exist for 10 seconds.

Can I mute my opponent’s chat?

Click on “Mute chat” in the game menu, when your game is open.

How does the “auto roll dice” functionality work?

It auto rolls the dice as long as it is turned on, and until the game ends. When the game ends, it automatically sets to “Off” for the new game.

How do I create a game?

Click on the blue “Create Game” button in the Play lobby. Now you must wait for an opponent to join, which you can then either accept or refuse.

*How does the “Greedy bear-off” functionality work? *

It maximizes the number of checkers you can bear-off. If there are more than one move, which takes out the same number of checkers as a maximum, then it doesn’t move anything and waits for human player to move. At the moment the feature is not working yet.

How do I join a match?

Click on the blue “Join” button in the Play lobby, and wait to see if opponent accepts or declines your proposal.

How to read the equity numbers in Analysis?

Equity is how we measure value in Backgammon, and we find the best actions by comparing the equity of each of them. The unit of “equity” is points. Absolute equity are written without parenthesis, and errors are written in parenthesis, which are the difference between the given action and the best action, according to the computer analysis.

What is the rank order of “level of play” after each match?

error rate < 1 -> "Galactic" 1 <= error rate < 2 -> "Super Human" 2 <= error rate < 3.3 -> "Grand Master" 3.3 <= error rate < 4.1 -> "International Master" 4.1 <= error rate < 5 -> "Master" 5 <= error rate < 6 -> "Expert" 6 <= error rate < 8 -> "Advanced" 8 <= error rate < 11 -> "Experienced" 11 <= error rate < 15 -> "Intermediate" 15 <= error rate <= 20 -> "Rookie" 20 < error rate -> "Beginner"

What are the Galaxy Rating intervals for the titles?

rating >= 2600 -> "Galactic Master" rating >= 2400 -> "Grand Master" rating >= 2100 -> "Master" rating >= 1900 -> "Expert" rating >= 1700 -> "Advanced" rating >= 1550 -> "Experienced" rating < 1550 -> "Rookie"

How do I reset my password, if I cannot remember it to login?

Click on the “forgot password” link on the front page. Now you must enter your email address in the form, and a reset code will be sent to your email, while on the Galaxy website you will be directed to a new form to fill. Copy the code from your inbox (remember to check your spam filter if you cannot find the email) and paste the reset code. In the other two text boxes you input your new password and confirm it. If it doesn’t accept your new password, it is probably because something is wrong with the password (minimum 6 characters and don’t include any strange characters, only letters and numbers). Now, hopefully you have reset your password successfully, and you can login from the front page like usual. There is a post in our Academy page with screenshots, if you need further assistance.

Can I change my username?

No, when an account and username has been created it can never be changed. This would really mess up our ranking list, if that was possible.

I made fewer mistakes, why was my error rate higher than my opponent?

Most likely, it is because you had fewer decisions than your opponent. Remember, the error rate is calculated by the total equity loss divided by the number of decisions, and then multiplied by -500.

What are the green, yellow and red icons in the Analysis window?

Yellow icons are “errors” and red icons are “blunders”. A blunder is simply a big error, with the size of -0.080 equity difference from best action or bigger. And error is an action with -0.020 equity difference from best action or bigger. If a move in not the optimal, but it is smaller than -0.020 in equity, it is not considered an error, just an inaccuracy. If you are a Analysis- or Combo member, you can click on the icons and see the detailed analysis of the move.

The green icons are the best possible action, namely the computer move from Extremegammon ai.

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