Do I have to declare check here?

So I was playing chess with someone and we had a disagreement.

I was black and moved my rook from C1 to D1 (Rd1). The person I was playing with then moved their knight to B4 (Nxb4) and took my queen. This left their king open, so I said checkmate and took their king with my rook.

The person then said that's not a valid play and to restart from where I moved my rook to D1 because at that point I have to declare check because their king could be taken.

This didn't make sense to me because shouldn't it be the other player's responsibility to know that moving their knight would leave their king open?

I couldn't have guessed that they'd make a move giving me an opening right?

I argued with the person and they said that these were the rules of chess and since I'm no pro I wanted to ask to find out who's actually right. Hopefully my question is clear enough.

-------Admin----------------

Hi,
I have created a new diagram to see the board and pieces clearly.

First of all you have not placed the chess pieces correctly in the beginning of your game. The white pieces should be placed at rows number 1 and number 2. The black pieces should be placed at rows number 7 and number 8. You have placed your pieces the other way round so your coordinates are all wrong.

See image below:

Pieces should be placed like this
check



You as Black played 1...Re8 pinning the knight on e4. This means the white knight can't move because the king is behind it. Simple.

So after your move 1....Re8 it is illegal to capture the queen with the knight.

By the way even if you could give a check it would not be checkmate, the king would just move away, out of the check, and that's it. If a king can't move away from a check it would be checkmate.

You can't capture a king, this is illegal.

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