Preventing Castling

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Avatar of zealiff

I am going through the entire learning course on Chess.com.  I am on this lesson about preventing castling, and I just moved my Bishop to a6, preventing white from castling.  But, I don’t understand why white cannot castle.

It doesn’t put white in check, since the King moves to g1, and the Rook moves j1, and he wasn’t in check already.  Two of the three rules to castling.

Can someone tell me why white isn't aloud to castle?  I am obviously missing a rule to castling.

Avatar of Alramech
zealiff wrote:

I am going through the entire learning course on Chess.com.  I am on this lesson about preventing castling, and I just moved my Bishop to a6, preventing white from castling.  But, I don’t understand why white cannot castle.

It doesn’t put white in check, since the King moves to g1, and the Rook moves j1, and he wasn’t in check already.  Two of the three rules to castling.

Can someone tell me why white isn't aloud to castle?  I am obviously missing a rule to castling.

 

So the rule is that the king cannot pass through check.  The Black bishop attacks f1.  Imagine the king is going to castle and end up on g1.  It would have to move through the f1 square to get there.  Because the Black bishop is attacking that square (and would check the king as he passed through!), White cannot castle.

 

Avatar of zealiff

Through check!  I missed that.  Thank you.

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