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Does Backgammon NJ cheat?

Posted By: Stick
Date: Sunday, 20 June 2010, at 5:33 p.m.

In Response To: Does Backgammon NJ cheat? (David Rockwell)

The creator of NJ Backgammon is Jimmy Hu and reads here on the forums. I hadn't used NJ much because I don't play a lot of bg on my iphone but thought I'd give it a whirl to add more data to this. I just played 10 games but will add more data at a later date if I continue playing.

First, I played v. the highest skill level which is Expert. I am playing a money session and here are the simple win/loss stats from my first ten games:

  • Game #1 - W, +2
  • Game #2 - W, +4
  • Game #3 - W, +2
  • Game #4 - W, +4
  • Game #5 - L, -1
  • Game #6 - L, -1
  • Game #7 - W, +2
  • Game #8 - L, -2
  • Game #9 - L, -2
  • Game #10 - W, +1

I played standard backgammon with the small exception of tweaking my play a little so that if the computer was on the bar I might play on more than I normally would to get the statistics. My ER according to NJ during this session was 2.8. As you can see above, I won 6/10 games with a net of 9 points. To stick to what Greg was doing I only noted when either myself or the computer tried to enter v. a 4pt or 5pt board.

Here are the stats for myself trying to enter v. a 4pt board.

  • took 1 roll to enter
  • took 1 rolls to enter
  • took 2 rolls to enter
  • took 2 rolls to enter
  • took 2 rolls to enter
  • took 4 rolls to enter
  • 0/1 (then built to 5pt board)
  • 0/2 (then broke down to 3pt board)

And how I did against a 5pt board:

  • took 1 roll to enter
  • took 3 rolls to enter
  • took 3 rolls to enter
  • took 5 rolls to enter
  • 0/4 (then closed out)
  • 0/2 (then broke down to 4pt board)

Now to how the computer did v. a 4pt board:

  • took 1 roll to enter
  • took 1 roll to enter
  • took 1 rolls to enter
  • took 1 roll to enter
  • took 2 roll to enter
  • 0/1 (then cubed out)

And the computer v. a 5pt board:

  • took 1 rolls to enter
  • took 1 roll to enter
  • took 2 roll (to enter two)
  • took 3 rolls to enter
  • took 5 rolls to enter
  • 0/2 (then broke to 4pt board)
  • 0/1 (then cubed out)

Now statistically the sample is near meaningless but I wanted to put it out there for Greg. You should note all the specifics of your sessions that might be relevant. It's impossible to go back and get the data since the matches aren't saved. I have stuff listed here that probably serves no use but just in case, I noted it down.

You say you are playing the highest level, which would be Expert, you are 'ahead of the highest level by 73% (does that mean you've won 73% of the games and the computer has won only 27% or something else?), over a period of '5,000 games'. For all your stats as I understand them to be true would take a small miracle. Could you clarify what you mean by 73%, tell us what the highest level is, tell us what kind of 'games' you're playing, money, dmp, match lengths, and why you think you must have played at least 5,000 games?

Stick

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