iPhone Screenshots


● 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
● CUSTOMIZABLE -- More options than any other backgammon app

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

Backgammon NJ 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 & other players. Using Tutor Mode & Hints, Backgammon NJ 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 and friends." -Phil Simborg, Professional Backgammon Teacher and Player, www.mindgamescenter.com

"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 and has more useful functions than any other backgammon apps out there."

"For serious backgammon players, Backgammon NJ is the way to go." -Macworld.com, 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 (http://www.njsoftware.com/note.html)
• Who won't expect to win consistently on the higher skill levels


• 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 points
• Crawford rule for match play
• 1-player mode vs. computer
• 2-player mode on one device
• Game Center: Play real-time or turn-based online matches with friends & other players
• Chat with your online opponent
• Online Elo & Experience leaderboards
• Block list for auto-match
• User-friendly, tap-to-move interface
• Highlighted checker movement options
• Hint & Undo
• Learn with Status Meter & Tutor Mode
• Game & dice stats, including Elo rating & ER
• Match info: GnuBG ID, win chances, equity, top 10 moves, & cube decisions
• Email match files
• Practice mode with unlimited undo (1-player vs. computer)
• 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


• If an online match ends for any reason, you'll receive the Elo pts you deserve. FAQ: http://gamecenter.njsoftware.com
• Contact us for help: http://contact.njsoftware.com

What’s New

Version 6.1

- Added arrow buttons to analysis move List to quickly jump to top and bottom
- Updated for iPhone X
- Bug fix for analyzing two matches in a row with different match lengths
- Bug fix for online play chat input line being covered by keyboard on iOS 11


- On iPhone X, to return to the Home screen, swipe up once on the Home indicator at the bottom of the board to activate it, and swipe up a second time on the Home indicator to return to the Home screen.

- If you're experiencing app crashes, it's most likely caused by Apple Game Center bugs. To prevent the crashes, do the following:

1) In BGNJ, under Advanced Options > Online Settings > turn OFF "Enable Game Center"
2) Force quit BGNJ (double-tap Home button and swipe away BGNJ)
3) Run BGNJ and play OFFLINE matches only

For more info, contact us directly: http://contact.njsoftware.com

Ratings and Reviews

4.4 out of 5
671 Ratings
671 Ratings
pacer1234567 ,

Rock Solid. Thanks for manual dice mode...

Used to be a fan - not so much anymore. Users' experience is that the game cheats and developers response is that users are not as good as they think. WRONG. Developer ignores the subjective user experience, which is just bad business.

Overall I like the game and have played thousands of games. I think the flaw in AI design is the 4 levels: easy, medium, hard, expert. The only way to pragmatically make these levels appear to act progressively more advanced is to choke or open the competitive advantage granted to the computer (in my opinion). Regardless, the end result is well described by hundreds of users and that is a bias that the game feels as if it has an unrealistic advantage. This can get tiresome. NOTE computer rolls 7s to enter board from bar like crazy. To compete you should avoid being uncovered on 7.

The developer should spend some energy trying to address this common user observation because just as he asserts that his game does not cheat, I would like to assert that all of the users' experiences cannot be dismissed either. So I believe there is room for improvement - but I also imagine it would be a tremendously difficult programming problem to solve.

PHK1853 ,

Plays well but unrealistic

I believe that the look and feel of This backgammon app is the best out there. I have read many other reviews and I have noticed that the developer is maniacally defensive about comments that the game is skewed toward the AI. I have to say, though, that after having played literally thousands of games on this app, there is absolutely no doubt that it is skewed toward the AI. Yes, I have a slight winning record but the incredible number of times the AI gets perfect rolls is just ridiculous. There is no risk a human player can make that will go unpunished and no opportunity for the AI that will go unfulfilled. I've also noticed that the game is "streaky". When I realize that the streak is in my favor I know I can make riskier plays,and play more conservatively when the streak is against me. The game has such good motion, appearance, and fluid motion I have been reluctant to give up on it. The time has come, though, where my frustration with the game has superseded the positive attributes. When the developer makes changes in logic to achieve more realistic outcomes I will gladly come back, but for now I am done with this game.

Developer Response ,

The app is honest & has random rolls. Proofs here: http://www.njsoftware.com/note.html

The proofs are for those who want to make an honest effort to understand them.

gupta finelli ,

Best backgammon game available

The graphics aren’t as snazzy nor are the sound effects as crisp as some other BG games but there is no equal to the uniquely realistic gameplay in BGNJ. The AI is superb, the gameplay is fair. Any reports of “rigging of the dice” is a delusion in the mind of the player. Tutor modes and game analysis allow you to see your errors and really improve your game. Another highlight, the “league” of players is small but highly skilled and devoted. Best of all there is no constant “buy in” for chips or coins. You buy the game once and that’s it. The rest is playing and improving your ER. There is a crashing issue that seems to be a function of Game Center, so says the developer. It’s still the best game out there.

One suggestion: open up the microphone. Then players could talk to each other in real time. Would save typing in the chat window and would make the game very social.

Developer Response ,

Thanks, gupta!


Jimmy Hu
21.4 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© 2018 NJ
In-App Purchases
  1. Power User $4.99
  2. Analysis Package $2.99
  3. Online VIP $2.99


  • Game Center

    Challenge friends and check leaderboards and achievements.

  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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