Body: <p>I am a begeinner learning the Colle system. However, I am immediately confused after facing the anti-Colle:</p>
  <pre><code>[FEN &quot;&quot;]
  [startply &quot;6&quot;]
  1. d4 d5 2. Nf3 Nf6 3. e3 Bf5 
  </code></pre>
  <p>After losing the game, I learn from the engine, or the opening explorer that the 'correct' move is 4.c4. But why? What is the idea behind? Why is 4.Bd3 not as good? Also, what will be the strategy or main idea after the 4.c4 move?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-07-19T16:17:24.663Z
Comments.Text: Black bishop is no longer defending b7, and you want to exploit that, 4.c4 allows your queen to come to b3 and put pressure on b7 and d5.
Comments.UserDisplayName: Akavall
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-07-19T18:10:39.533Z
Comments.Text: Also, Bf1 is technically the good bishop, Bf5 the bad, and you don't want to exchange it. (Assuming the center formation stays stable!)
Comments.UserDisplayName: Hauke Reddmann
Tags: <opening><colle-system>
Title: How to play against Anti-Colle
ThreadText: # How to play against Anti-Colle
  
  (Asked by: username_0 on 2022-07-19)
  
  I am a begeinner learning the Colle system. However, I am immediately confused after facing the anti-Colle:
  
  ```
  [FEN ""]
  [startply "6"]
  1. d4 d5 2. Nf3 Nf6 3. e3 Bf5 
  
  ```
  
  After losing the game, I learn from the engine, or the opening explorer that the 'correct' move is 4.c4. But why? What is the idea behind? Why is 4.Bd3 not as good? Also, what will be the strategy or main idea after the 4.c4 move?
  
  **Tags:** opening, colle-system
  
  > **Comments:**
  > **username_1**: Black bishop is no longer defending b7, and you want to exploit that, 4.c4 allows your queen to come to b3 and put pressure on b7 and d5.  
  > **username_2**: Also, Bf1 is technically the good bishop, Bf5 the bad, and you don't want to exchange it. (Assuming the center formation stays stable!)  
  
  ---
  
  ## 0 answers
  
  