CheckMate - Definitely

When a King is in check, he is not necessarily in Checkmate.

Queen with the King

The previous posts have show checks that may lead to checkmate, but now we will discuss Checkmate. After studying the Queen piece moves, we can understand the following chess moves.

A Queen move can force Checkmate, and this is how:

 Look at this diagram closely. Why is this a checkmate position?
Review the Queen's capturing powers.

1. The White Queen is attacking Black King. This is a check.
2. No chess piece can capture the Queen.
3. No piece can block the attack.

Three conditions to look for before either side moves. Let's continue the play:
1. The King cannot flee from the attack.
2. Every square that the King tries to move to is in the range of capturing.

(In the case of this diagram, the Black King can not get out of the way of the White Queen or White King. If he attacks the White Queen, the White King will capture him. He cannot move to any square next to him because they are controlled by the opponent  chess pieces.)

In Summary:
Checkmate complete!
The chess game is over!
Black side lost! 


Explanation:
In chess, the King is never captured (unlike real war situations).
Checkmate just means that the King cannot move out of a capturing situation and that is what ends the game.

If the White King was not protecting his Queen, the Black King could have gotten away by capturing the White Queen. The White King was nearby and was actively participating in the check.

Next, we will see how the Rook forces checkmate.

marblechessboard.com