From what I can see, this is what the board looks like:

https://files.catbox.moe/dmm1w1.png (Note thanks to whoever posted this link)

I don't see white king in check, but I could be missing something.

I believe there is a hidden message in this chess game. This is what the board looks like so far:

https://files.catbox.moe/dmm1w1.png

First notice that Pompeo is playing black. This is symbolic because the White Hats have been letting the Black Hats move first during this Great Awakening, choosing instead to counter-PUNCH.

You will notice that both players have made 5 moves. White is playing defensive, and Black is playing aggressive. In particular, the Black Knight moves twice to get right in on the front lines. In the past I know "Midnight Riders" has been referred to in Q posts as White Hat Operatives (if I'm not mistaken?). I think Pompeo is telling us the "Midnight Riders" are in the fight.

Also, Pompeo's prior tweet, 4 hours before the chess board tweet, was the following:

“Put on the full armor of God, so that you can take your stand against the devil’s schemes.” Ephesians 6:11

So it would seem like the Patriots were/are getting ready for a fight.

The strange part that I don't understand is why would Pompeo declare "Checkmate." in his tweet, when there is no checkmate in the game he is currently playing?

I'm pretty sure this is what you are looking for:

MAJIC EYES QNLY video LAW OF WAR: THE STORM (SUPER-PROOF)

https://www.bitchute.com/video/smHo7L5LhZhc/

The first time someone made a connection with a Q post and the Law of War Manual was January 19th, 2021. (Also 1 day before Biden was "inaugurated". Coincidence?) This initial connection was a big breakthrough, however, now this Q Proof takes this to a whole other level. This is excellent research, thank you Anon for all the hard work.