Backgammon NJ for Android

Jimmy Hu

In-app purchases

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

Ratings and reviews

I have noticed, statistically, that around the time I start bearing off, 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 be very, very high for the computer early on in the game, when doubles are particularly advantageous. Yours, not so much. You will tire quickly of this insulting nonsense.

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.

I have played on this app daily (expert mode) for some time and loved it (5*) as the most challenging bg app. But recently it keeps resetting itself: easy mode, sound on, display pips etc. There seems to be no logic to this, sometimes several times a day, sometimes a couple of weeks with no incident. Running Android 12 on Pixel 4a. Would love this bug to be fixed, otherwise will need to stop using.

What's new

v4.8:
- Updated for latest Android API level