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Backgammon NJ HD

By Jimmy Hu

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● GAME CENTER -- Play online, chat, invite friends, auto-match with random players
{ Real-time } Play online in real-time
{ Turn-based } Play online at your own pace
● VERSATILE -- Play offline vs. computer or against another person in 2-player mode
● UNIVERSAL -- Supports iPad, iPhone, & iPod touch
● RETINA -- Supports high resolution Retina screens of iPad, iPhone, & iPod touch

Play & learn backgammon at skill levels from beginner to world-class!

Backgammon NJ HD is a full-featured game which uses an advanced, neural network-based, artificial intelligence. Play against a computer AI, another person in 2-player mode on one device, or online against friends & others. Using Tutor Mode & Hints, Backgammon NJ HD can show you how to improve your game.

Discriminating players will appreciate how well the AI plays. It uses a neural network trained on millions of positions, a bearoff database, & a match equity table to achieve strong gameplay that will challenge even expert players.


"[I] know strong bg play when I see it. This app is the strongest iPhone bg app I've played with by far. It does not cheat period. ...Analyzing these matches with eXtreme Gammon confirms a world class level of play with normal luck factors. If you are losing, get over it. So would 99.9% of the other backgammon players in the world. It is just that good. Learn from it." -Richard Munitz, Giant of Backgammon, #21 world ranking in 2009

"Backgammon NJ plays at an extremely high level with an excellent interface, and I often use it to practice on my iPhone when I am traveling. I recommend it highly to my students & friends." -Phil Simborg, Professional Backgammon Teacher & Player,

"I've played over 500 games now; I've checked about 5% of these against World Class Desktop programs (GNU, BGBlitz); and I've actually used some of the competition. NJ has the best interface & has more useful functions than any other backgammon apps out there."

"For serious backgammon players, Backgammon NJ is the way to go.", May 2012


This game is best for people:

• Who recognize the strength of neural network backgammon bots
• Who want to improve their game by playing against a world-class level AI
• Who will use the in-depth, technical features included in the app to prove that it is honest (
• Who won't expect to win consistently on the higher skill levels


• If an online match ends for any reason, you'll receive the Elo pts you deserve. FAQ:
• Online match disconnect info:
• We can't respond to reviews. Contact us directly:


• Neural network-based AI
• 2 game types: Standard Backgammon or Nackgammon
• 4 skill levels: Easy, Medium, Hard, Expert
• Customizable board design & checker colors
• Mersenne Twister algorithm for random number generation
• Doubling cube
• Single games or match play up to 25 pts
• Crawford rule for match play
• 1-player mode vs. computer (no internet req'd)
• 2-player mode on one device (no internet req'd)
• Game Center: Play real-time or turn-based online matches with friends & other players (requires internet)
• Chat with your online opponent
• Online Elo & Experience leaderboards
• Block list for auto-match
• Tap-to-move interface
• Highlighted checker movement options
• Hint & Undo
• Learn with Tutor Mode
• Game & dice stats, including Elo rating & ER
• Match info: GnuBG ID, win chances, equity, top 10 moves, cube decisions
• Email match files
• Manual match recording mode with unlimited undo & speed mode option
• Options to reverse board direction, resign, use one-tap moves, auto bearoff, auto finish, use Jacoby rule, & much more
• Match analysis (in-app purchase): Analyze past match files, view moves & errors for match, step through match, jump to position, play from position, save match files permanently

What's New in Version 5.1.1

- Match files list shows player names
- Fixed bug where analysis mode errors were not normalized to doubling cube
- Added workaround to help prevent real-time match disconnections. As more players update to the new version, this workaround may have more effect. More info:

Questions? Contact us:


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Customer Reviews

Xlnt teacher, doesn't cheat

I'm an intermediate player, looking to better find those subtle and puzzling non-intuitive moves. The hint feature is excellent, especially when I don't use it and compare the ratings of the various choices until I find the best move.
As for the many reviewers who complain about cheating, it seems very normal to me. It's human nature to always focus on and be more upset about bad rolls, and blithely take the good rolls as our due, without noticing them, so get over it. If you understand probability and the normal curve it all washes out in the end. The author's explanations of why the program doesn't cheat are both reasoned and sound. And if you're not listening to the world-class players who say the program is fair, then there's nothing else anyone can say. Because you might have been playing forever says absolutely NOTHING about your level. It's also human nature to think we're better than we really are, and if you've been repeating the same errors during 50 years of play you might still be a low intermediate player.
Summary: great program and value; excellent tutor; doesn't cheat; whiners, get over it.

Fun, challenging,flawed

I play this a lot, and enjoy it. It has sharpened my game. But i have strong evidence that it cheats.

I know that players often suspect that a computer backgammon pgm cheats, when the game is really just playing at a much superior level. This thought certainly occurred to me often when playing against this pgm at a high difficulty setting. However, I recognize that a superior player may look too "lucky" to believe when in fact it is merely playing the odds better than I am.

But then, at the end of a certain game, I was sure to lose. Both sides were bearing off. I would need two high doubles to win, and then only if the computer rolled really poor dice, e.g., 3-2, 1-2. (Sorry I don't remember the exact position.) I was surprised when the computer hinted that I should double! No way. And then I rolled two high doubles in a row against really poor dice for the computer and I won. There is no way that the computer program could hint that I should double unless it was using information about subsequent rolls, information that I did not have.

I know that the game generates the series of rolls at random before the game starts. This was used as evidence that the program does not generate dice favorable to itself. But now I strongly suspect that it uses that information during the game. In this case, it used it in my favor, but that just means that it cheated on my behalf. Maybe it cheats for itself as well.

Frustratingly good

Beautiful graphics and well designed game for hours of addictive playing.

Author goes to great lengths to prove the dice rolls are random. I've tried but failed to prove otherwise because it sure feels like certain rolls are not random. For example, if I open 6-3 from the 24 to the 15 point it is amazing how often the computer will roll a 3 the next play. It seems more like 60-80% than the 11/36 odds it is in actuality. Also if the computer is on the bar and needs a 1 or 5 to get off it seems to be almost automatic that's what it rolls (but not quite). And it is astonishing how often the computer will roll double 6 to avoid being gammoned.

Where I really do question the game is in the Hint function. If there is more than one option how to play a given roll the hint will almost invariably suggest the riskier, more disadvantageous play. But this no doubt is a result of a certain strategy being programmed which is different from the strategy I play.

These observations are based on hundreds of games played. Would be interesting to know if others notice the same things, or how this compares to a similar number of games with a physical game board and dice.

Still, it is a great game and will improve your skill level even if you do want to throw it at the wall sometimes!

Backgammon NJ HD
View In iTunes
This app is designed for both iPhone and iPad
  • $7.99
  • Category: Games
  • Updated:
  • Version: 5.1.1
  • Size: 35.7 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 6.0 or later. Compatible with iPhone, iPad, and iPod touch.

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