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Key Concepts of Chess - The Hedgehog

In order to understand openings properly, the middlegame should actually be studied first. Because all plans in the middlegame link directly to the ideas from the opening. Almost everything is hung up on pawn structures. Therefore, IM Herman Grooten takes the club chess player by the hand to take a closer look at common middlegame structures. 

On this video course Grooten discusses the basic ideas for both White and Black of a typical structure that can arise from various opening variants. This is the so-called “hedgehog system” which is characterised by at least four black pawns on the sixth rank which we call the “spikes” of the hedgehog. Another essential aspect is that the exchange of a black c-pawn for a white d-pawn (as in the Sicilian) creates a position in which, partly due to c2-c4, a large space advantage is obtained by White. But that the “hedgehog” is viable will become clear in all the examples shown, as the author likes to use this system himself!

• Video running time: 4 hours (English)
• With interactive training including video feedback
• Extra: Model Games and Training with ChessBase apps - Play key pawn structures against Fritz on various levels


This is what is delivered:

  • Fritztrainer App for Windows and Mac
  • Available as download or on DVD
  • Video course with a running time of approx. 4-8 hrs.
  • Repertoire database: save and integrate Fritztrainer games into your own repertoire (in WebApp Opening or in ChessBase)
  • Interactive exercises with video feedback: the authors present exercises and key positions, the user has to enter the solution. With video feedback (also on mistakes) and further explanations.
  • Sample games as a ChessBase database.
  • New: many Fritztrainer now also available as stream in the ChessBase video portal!

That's what the FritzTrainer App can do for you:

  • Videos can run in the Fritztrainer app or in the ChessBase program with board graphics, notation and a large function bar
  • Analysis engine can be switched on at any time
  • Video pause for manual navigation and analysis in game notation
  • Input of your own variations, engine analysis, with storage in the game
  • Learn variations: view specific lines in the ChessBase WebApp Opening with autoplay, memorize variations and practise transformation (initial position - final position).
  • Active opening training: selected opening positions are transferred to the ChessBase WebApp Fritz-online. In a match against Fritz you test your new knowledge and actively play the new opening.

Even more possibilities: Start FritzTrainer in the ChessBase program!

  • The database with all games and analyses can be opened directly.
  • Games can be easily added to the opening reference.
  • Direct evaluation with game reference, games can be replayed on the analysis board
  • Your own variations are saved and can be added to the own repertoire
  • Replay training
  • LiveBook active
  • All engines installed in ChessBase can be started for the analysis
  • Assisted Analysis
  • Print notation and diagrams (for worksheets)

Extrait vidéo


  • Introduction
  • Schematic plan a
  • Schematic plan b
  • Schematic plan c
  • Background knowledge
  • Stean-Andersson
  • Learning from the Hedgehog Classics
  • Fischer-Andersson
  • Byrne-Andersson
  • Typical Plans for White
  • Shaving the Spykes: The Nd5!? Motif
  • Shaving the Spykes: a2-a4-a5
  • Shaving the Spykes: b2-b4 & c4-c5
  • Shaving the Spykes: e4-e5
  • Weakness provocation: f4-f5
  • Push g & h-pawns: g2-g4-g5; h2-h4-h5; g6
  • Summary plans for White
  • Typical Plans for Black
  • Pawn Trusts: b6-b5
  • Pawn Trusts: d6-d5
  • Pawn Trusts: b5 and ...d5
  • Pawn Trusts: h-pawn bayonet
  • Bishop redeployment
  • Fischer's ...g5 plan I
  • Fischer's ...g5 plan II
  • The Marozcy Bind in relationship to the Hedgehog
  • Move orders with e4
  • Move orders with c4
  • Move orders with d4
  • Move orders with Nf3
  • Own Games in the Hedgehog
  • Wintzer-Grooten
  • Hausrath-Grooten
  • I.Böhm-Grooten
  • Conclusion
  • Exercises
  • Exercise 01
  • Exercise 02
  • Exercise 03
  • Exercise 04
  • Exercise 05
  • Exercise 06
  • Exercise 07
  • Exercise 08
  • Exercise 09
  • Exercise 10
  • Exercise 11
  • Exercise 12
  • Exercise 13
  • Exercise 14
  • Exercise 15
  • Exercise 16
  • Exercise 17
  • Exercise 18
  • Exercise 19
  • Exercise 20
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