Screenshots

Description

● 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
● UNIVERSAL -- Supports 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.

REVIEWS

"[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, 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 & 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

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 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

FEATURES

• 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
• 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
• 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
• 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 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 6.2.1

- Updated for iOS 13
- Added two slower checker speeds
- Native resolution graphics for 10.2" iPad

Ratings and Reviews

4.5 out of 5
2.2K Ratings

2.2K Ratings

Dichterliebe1 ,

Surprisingly good but not the place to find skilled competition

The reality is very few people are truly good at backgammon, so it appears computers cheat or dice aren't fair. No, you just need to improve. No app is good as XG for learning the game, but after playing this a while I've found there to be many useful features, clean interface, strong AI, and fair rolls. Trust me, play against a world champion and you will think they have rigged dice too. I've played against enough people on this app to confirm that there are a lot of weak players on here, the main downside of this app. And people play short matches, which misses out on much of the richness of backgammon. I would like a way to manually input an email address to send match files to, instead of having to use the Mail app. Analyze mode doesn't give enough info on cube decisions - is it No double because it's not good enough, or too good? And the dice rolls show up on the same side of the board, a bit confusing. But, it's a pretty well done app overall.

Developer Response ,

In Analysis mode, there are two types of doubling errors:

1) If it says "Error (No double)" in the status bar area or "(ND)" in the Move List, it means that you didn't double when you should have.

2) If it says "Error (Double)" in the status bar area, it means that you doubled when you shouldn't have. In this case, it's either "too good to double" or "not good enough to double". To tell which, look at the equity and compare it to +1.00 (if the cube is at 1). If the equity is > +1.00, then it's "too good to double". If the equity is < +1.00, then it's "not good enough to double". In the unlikely event that the equity = +1.00, then look under Advanced Options > Match Info to see the equity to 3 decimal places (before it was rounded to +1.00).

***

If you turn on One-Tap Moves (under Menu > Settings), it will do what you want.

AirPrint SchmairPrint ,

Cheats - Here’s how to prove it

I consider myself to be a very good backgammon player. Made a lot of beer money in college in the early 80's playing gammon for 25 cents a point. Anybody who says this app doesn't cheat is smoking crack. I proved the cheating to myself and you can do the same. I played 10 games on the expert mode with the computer generated dice rolls. I lost EVERY game. Then I changed the option to manual dice rolls, still on expert mode. When I manually rolled the dice and forced the computer to play those random rolls, I won 7/10 games. Unfortunately, manual dice rolling is very tedious, but — it's the only way to ensure that the computer plays fair. The manual dice rolling option is the only reason why I would recommend this app. FYI - I’ve downloaded many other backgammon apps and they ALL cheat. The AI in this app, like in every other app I’ve played appears to be the same for all modes. The only difference between beginner and expert modes is the amount of timely doubles and perfect rolls generated by the computer. Where this app can help improve your play is by learning to strategically use the doubling cube and recognizing pip count advantages. For beginners, looking at the hints might also help improve your game.

witttiger93 ,

Best iOS BG app I’ve found!

I’m not in any way an accomplished player, but I’m fascinated with the game and this app is the best Player vs AI I’ve found on the iOs platform. I’ve seen the accusations from other reviewers about the AI cheating by looking ahead at the previously generated roll values and adjusting its strategy accordingly. I don’t believe this for two reasons: 1) I’m a novice-level player with poor math skills who’s also hampered by deficient strategic thinking. And yet, through repeated play, I’ve improved and consistently beaten the AI enough to advance to a higher difficulty level. And 2) why would a developer hope to successfully launch an app by deliberately designing it to cheat the player? Especially in this case where there’s no further play-based profit to be made beyond the initial purchase, so why would there even be an incentive to do so? It makes far more sense to go to every length to ensure an unbiased game environment, which is what I believe this developer did. I don’t get to play on a real board against other people very often, so I love playing and practicing on this app!

Developer Response ,

Thank you for being a voice of reason. After 10 years of this, we know that doubters will never believe you, but nonetheless, thank you for the effort! The proofs (http://www.njsoftware.com/note.html) are there which show that the AI doesn't change its strategy based on dice rolls, but as we all know, doubters don't read proofs.

We hope you continue to enjoy the app and improve your backgammon skill. =)

Information

Seller
Jimmy Hu
Size
54.3 MB
Category
Games
Compatibility

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.

Languages

English

Age Rating
4+
Copyright
Price
$7.99
In-App Purchases
  1. Analysis Package $2.99
  2. Online VIP $2.99
  3. Power User $4.99

Supports

  • 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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