Chess Opening Blunders icon

2.4.2 by Chess King

Jul 4, 2023

About Chess Opening Blunders


Learn how to trap and how to avoid typical problems in more than 40 openings!

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 (, which is an unprecedented chess teaching method. In the series are included courses in tactics, strategy, openings, middlegame, 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

♔ 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

♔ You can link the app to a free Chess King account and solve one course from several devices on Android, iOS and Web at the same time

The course includes a free part, in which you can test the program. Lessons offered in the free version are 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

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

What's New in the Latest Version 2.4.2

Last updated on Jul 4, 2023

* Added training mode based on Spaced Repetition - it combines erroneous exercises with new ones and presents the more suitable set of puzzles to solve.
* Added ability to launch tests on bookmarks.
* Added daily goal for puzzles - chose how many exercise you need to keep your skills in shape.
* Added daily streak - how many days in a row the daily goal is completed.
* Various fixes and improvements

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Additional Game Information

Latest Version

Request Chess Opening Blunders Update 2.4.2

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Requires Android

Android 5.0+

Available on

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