king discovered check. if your opponent doesn't mind, just pin their king to the back rank, march yours over there, then move it out of the way.
killer King Achievement

how to get this reward ?
It is simple, have 2 rooks more and go for discovered checkmate, like this
or like this if you have it:

It is never possible to checkmate with a king because that would put your king in check.
It's a discovery checkmate by moving the king.

It is never possible to checkmate with a king because that would put your king in check.
It's a discovery checkmate by moving the king.
Yes, post number #88 explain the terminology very well, thank you my friend.. i forgot how it is called this check technique..👍

you get it when you castle and checkmate https://www.chess.com/analysis/game/live/4920221408?tab=review
here a game where someone wins by casting

It is never possible to checkmate with a king because that would put your king in check.
discoverd checkmate with king?
Vengo buscando la razón de este premio y el rey no puede dar jaque mate el que da jaque mate es la dama

you get it when you castle and checkmate https://www.chess.com/analysis/game/live/4920221408?tab=review
here a game where someone wins by casting
and you get the achivement castle victory and killer king

https://www.chess.com/blog/Nightwish85/killer-king
Just read this blog, it might help you 🤗
(Credits to @Nightwish85)
I do not know how
Please tell me
when the white king moves out of the way, the white queen checks the black king, and because the black king can't move anywhere, it is checkmate. You may think it is checkmate with a queen, because the queen is giving checkmate, but checkmate with a queen is when a queen moves itself to checkmate. In this situation, Then king moves to deliver checkmate, hence why it is the king delivers checkmate.

Killer King:
Is a hidden Achievement, which doesn't appear in the list until you unlock it in a match.
Like the other achievements, Killer Bishop, Killer Queen, Killer Knight, Killer Rock and Killer Pawn, this achievement is unlocked by promoting checkmate by moving the corresponding piece.
As a king cannot attack another king, the only way to achieve this is by following the second method: moving your king, so that it gets out of the way of another piece to attack the opponent's king, resulting in mate.
As @jimlargon said:
"The killer *piece* does not really require “checkmate by attacking from a piece” but “checkmate by moving a piece”. So it’s the last piece moved in the game."
Example 1:
- Method 2 (Killer King):
https://www.chess.com/game/live/66347486077
Example 2:
- Method 2b (Killer King):
@Neviraptor shows an example of how to get the "Killer King" easier, with two towers:
https://www.chess.com/clubs/forum/view/killer-king-10
(Credits to @HMongenot)
I have recieved it. Thanks