Encyclopedia of Opening Blunders – learn to play chess by learning the opening mistakes and traps that have been discovered over time. The program is designed for studying the blunders in more than 40 openings and contains over 1,250 instructive exercises of varying difficulty from practical games.

This course is in the series Chess King Learn (https://learn.chessking.com/), which is an unprecedented chess teaching method. In the series are included courses in tactics, strategy, openings, middle game, and endgame, split by levels from beginners to experienced players, and even professional players.

With the help of this course, you can improve your chess knowledge, learn new tactical tricks and combinations, and consolidate the acquired knowledge into practice.

The program acts as a coach who gives tasks to solve and helps to solve them if you get stuck. It will give you hints, explanations and show you even striking refutation of the mistakes you might make.

Advantages of the program:
♔ High quality examples, all double-checked for correctness
♔ You need to enter all key moves, required by the teacher
♔ Different levels of complexity of the tasks
♔ Various goals, which need to be reached in the problems
♔ The program gives hint if an error is made
♔ For typical mistaken moves, the refutation is shown
♔ You can play out any position of the tasks against the computer
♔ Interactive theoretical lessons
♔ Structured table of contents
♔ The program monitors the change in the rating (ELO) of the player during the learning process
♔ Test mode with flexible settings
♔ Possibility to bookmark favorite exercises
♔ The application is adapted to the bigger screen of a tablet
♔ The application does not require an internet connection

The course includes a free part, in which you can test the program. Lessons offered in the free version is fully functional. They allow you to test the application in real world conditions before releasing the following topics:
1. Rare variations
1.1. 1.g3, 1.b4, ..
1.2. 1.b3
1.3. 1.d4
1.4. 1.d4 Nf6
1.5. 1.d4 Nf6 2.Nf3
2. Alekhine's defense
3. Benoni defense
4. Bird's opening
5. Bishop's opening
6. Blumenfeld counter-gambit
7. Bogo-indian defense
8. Budapest gambit
9. Caro-Kann
10. Catalan system
11. Center gambit
12. Dutch defense
12.1. Dutch defense
12.2. Iljin Genevsky system
12.3. Leningrad system
12.4. Staunton gambit
12.5. Stonewall variation
13. English opening
14. Evans gambit
15. Four knights' game
16. French defense
16.1. French defense
16.2. Classical variation
16.3. Tarrasch variation
16.4. Winawer variation
17. Grünfeld defense
18. Italian game & Hungarian defense
19. King's gambit
20. King's indian defense
20.1. King's indian defense
20.2. Classical variation
20.3. Fianchetto variation
20.4. Four pawns' attack
20.5. Saemisch variation
21. Latvian gambit
22. Nimzo-indian defense
22.1. Nimzo-indian defense
22.2. Leningrad variation
22.3. Rubinstein variation
22.4. Saemisch variation
23. Nimzowitsch defense
24. Old indian defense
25. Philidor's defense
26. Pirc-Robatsch defense
27. Queen's gambit
27.1. Queen's gambit
27.2. Queen's gambit accepted
27.3. Albin counter-gambit
27.4. Cambridge-Springs variation
27.5. Exchange variation
27.6. Orthodox defense
27.7. Lasker defense
27.8. Tartakower defense
27.9. Ragozin system
27.10. Semi-Slav defense
27.11. Semi-Tarrasch defense
27.12. Slav defense
27.13. Tarrasch defense
27.14. variation with 5.Bf4
28. Queen's indian defense
29. Queen's pawn game
30. Reti opening
31. Petroff's defense
32. Ruy Lopez
32.1. Ruy Lopez
32.2. Berlin defense
32.3. Bird's defense
32.4. Breyer variation
32.5. Chigorin defense
32.6. Classical defense
32.7. Exchange variation
32.8. Marshall attack
32.9. Steinitz defense deferred
32.10. Steinitz defense
32.11. Open defense
33. Scandinavian defense
34. Scotch gambit & Ponziani's opening
35. Scotch game
36. Sicilian defense
37. Three knights' game
38. Two knights' defense
39. Vienna game
40. Volga-Benko gambit

// Option A //

To download Chess Opening Blunders mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download Chess Opening Blunders mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download Chess Opening Blunders from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Chess Opening Blunders in HappyMod App.