Backgammon NJ for Android

In-app purchases
4.3
2.16K reviews
10K+
Downloads
Content rating
Everyone
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About this game

● Versatile -- Play offline vs. computer or against a friend in 2-player mode
● Customizable -- More options than any other backgammon app

Play & learn backgammon at skill levels ranging from beginner to world-class! This app is designed for both Android phones & tablets.

Backgammon NJ for Android is a full-featured game which uses an advanced, neural network-based, artificial intelligence. Play against a computer AI or against another person in 2-player mode on one device. Using Tutor Mode & Hints, Backgammon NJ for Android 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.

IS THIS GAME RIGHT FOR YOU?
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 are willing to use in-depth, technical features included in the game to prove that it is honest (https://www.njsoftware.com/note.html)
• Who won't expect to win consistently on the higher skill levels

FEATURES
• Neural network-based AI
• 2 game types: Standard or Nackgammon
• 4 skill levels: Easy, Medium, Hard, Expert
• 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
• 2-player mode on one device
• 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

IMPORTANT
If you're having issues:
• Make sure a task killer isn't killing BGNJ processes.
• Run BGNJ from main memory, not from memory card.
• We can't respond to crash reports submitted through Android OS. Contact us directly: https://contact.njsoftware.com
Updated on
Jan 1, 2022

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection

Ratings and reviews

4.2
1.78K reviews
Glenn Zorpette
February 25, 2024
I have long wondered what the algorithm uses to vary the skill level. I don't know. But I have noticed, statistically, that around the time I start bearing off, something funny happens. My probability of rolling 1-2 or 1-1 goes to near 100%. Meanwhile, the computer's probability of rolling 1-2 or 1-1 plunges, as far as I can calculate (after hundreds of games). In addition, probabilities of rolling doubles seem to become inverse: higher for computer, lower for player.
11 people found this review helpful
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John Semeniuk
September 10, 2022
I love the analysis and I do feel like using this app has made me a stronger player. I am not completely convinced, however, that the AI doesn't receive more advantageous rolls. If the AI hits you and leaves a blot in his home board you lose turns until you're completely closed out. Reverse the positions and the AI gets off the bar immediately, usually hitting your blot. The app would be so much better with fair dice.
33 people found this review helpful
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Jimmy Hu
September 13, 2022
The app is honest & has random rolls. Proofs here: https://www.njsoftware.com/note.html
Dale Lakes
February 9, 2024
I love this app. It has moved to #1 favorite backgammon app since XG Mobile is no longer supported on Android. My favorite feature of the premium version is the ability to export a match file and import it into eXtremeGammon desktop (uses the backgammon studios .mat format). According to xg world class analysis, the engine plays around a 4 PR in expert mode.
4 people found this review helpful
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What's new

v4.5:
- Added "Stop Auto Finish When Doubled" option
- Added "Display Statistic/Meter" option
- Added "Swap Match File Player Position" option
- Added "Analyze Most Recent Match" option to Double Tap & Swipe Left on Status Meter settings (included in Analysis Package in-app purchase)
- Added native support for 2560 x 1600 screen resolution
- Minor bug fixes

v4.7:
- Added "Dark Mode" option for pop-up and settings windows