Which piece in chess ??

 This question was asked on Koun Banega Karodpati program.

Question 

Rook and which of these pieces are moved during castling in chess  ??

1.  King

2.  Knight 

3.  Queen 

4.  Bishop 

Answer 

It is KING  !!!

Castling is a special defensive move to protect King and bring Rook into play .

It is the only move in chess where 2 pieces are moved at once and it helps to keep King safe in the corner.

But there are many conditions  ----

1.  Neither the Rook nor the King have already moved.

2.  There muat not be any other pieces between Rook and King.

3.  King must not be (  currently   )  in check.