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Why is it important to check that the king does not pass through or end on an attacked square during castling?

hard📝 Conceptual Q10 of 15
LLD - Design — Chess Game
Why is it important to check that the king does not pass through or end on an attacked square during castling?
ABecause the rook must not be attacked
BBecause the king must capture an opponent piece
CBecause pawns block the king's path
DBecause castling is illegal if the king moves through or into check
Step-by-Step Solution
Solution:
  1. Step 1: Recall castling safety rules

    The king cannot castle if it moves through or ends on a square under attack.
  2. Step 2: Understand the reason

    This rule prevents the king from moving into check, which is illegal.
  3. Final Answer:

    Because castling is illegal if the king moves through or into check -> Option D
  4. Quick Check:

    King safety during castling = B [OK]
Quick Trick: King cannot move through or into check when castling [OK]
Common Mistakes:
  • Focusing on rook safety instead of king
  • Ignoring attacked squares
  • Thinking king must capture during castling

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