Quantum Chess: What Happens When Physics Meets the 64 Squares?

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What if a knight could be on two squares at once — and you wouldn’t know which one until you captured it?

This is the idea of Quantum Chess. It’s a version of chess where the normal rules mix with ideas from quantum physics. It sounds strange, but scientists and game designers have actually worked on it.

⚛️ The Core Idea

In normal chess, every piece is on one square, and you always know where it is.

In Quantum Chess, pieces can be in more than one place at once. This is called superposition. You don’t know the exact position until something happens, like trying to capture the piece.

For example, a bishop doesn’t just move to one square. It can kind of “exist” in several places at the same time until the game forces it to choose one.

It’s like Schrödinger’s cat—but instead of a cat, it’s your queen, and the whole board is the box.

♟️ How It Changes the Game

  • You can make a move without fully deciding where your piece will end up

  • Your opponent has to take risks when interacting with your pieces

  • Normal tactics like forks or pins don’t always work, because the piece might not actually be there

  • Endgames become harder because you have to think about probabilities, not just moves

The game feels very different. You’re not just playing chess—you’re dealing with uncertainty.

🎮 Has It Been Built?

Yes, it has. There is a real version of Quantum Chess that people can play. It was created by developers and shown by physicists at events.

Now it’s used both for fun and for teaching science ideas.

💬 Big Question

Can Quantum Chess become a serious competitive game, or is it just a cool experiment?

In normal chess, you always have full information. But if you remove that certainty, does the game become deeper—or just more random?

You can try it yourself here:
https://quantumchess.net/play

Avatar of Kingbobthebuilder15
Um, this is AI generated.
Avatar of calbitt5750
Nonsense. The cat in the box was alive or dead. Not both at once.
Avatar of InfiniteSupriseReprize
King bob, you’re right
Avatar of long_quach

I already invented a decoy King. Looks and moves like a king, but the Game won't end with his capture.

Low tech.

Avatar of long_quach

Probabilistic motions are already invented in Kriegspiel, and backgammon.

Avatar of shru

Sounds confusing! Nice write up though!

Avatar of no_one_is_here110813
Nice AI
Avatar of Pope-of-bishops

AI generated + Wrong Forum group (not really but it's better in chess variants)

Avatar of long_quach

What kind of fake nonsense is this?

What kind of fake [bleep] [bleep] is this?

Physicists are not gamesters.

Avatar of long_quach

And before you invent a new chess, shouldn't you consider something?

If your chess has chance and is not deterministic, is it worth it to invent?

Chess promotes literacy because games are deterministic and are recorded.

If the record of a game is useless (who records backgammon games?), isn't that a detriment to chess?


I thought of it when I invent my new chess with unknown chance.

Avatar of Pope-of-bishops
long_quach wrote:

And before you invent a new chess, shouldn't you consider something?

If your chess has chance and is not deterministic, is it worth it to invent?

Chess promotes literacy because games are deterministic and are recorded.

If the record of a game is useless (who records backgammon games?), isn't that a detriment to chess?


I thought of it when I invent my new chess with unknown chance.

If it's fun then it's probably good, It's just that it's not a competitive game and could be played for fun (i haven't tried it so I don't know)

After all, older versions of chess did have dice

Also you could call that a Chess variant, "I invent my new chess" sounds wierd

Avatar of long_quach
Pope-of-bishops wrote:

If it's fun then it's probably good

Cards are more fun, but not good.

Bouncing lottery balls are fun (billions of dollars are spent on it anyway), but not good.

Avatar of long_quach
Pope-of-bishops wrote:

After all, older versions of chess did have dice

That is apocryphal. (That is not true).

Avatar of Pope-of-bishops
long_quach wrote:
Pope-of-bishops wrote:

If it's fun then it's probably good

Cards are more fun, but not good.

Bouncing lottery balls are fun, but not good.

Ok what do we mean by good here?

In cards there is a strategy after all (unless your playing totally random games)

Avatar of long_quach
Pope-of-bishops wrote:
 

Ok what do we mean by good here?

In cards there is a strategy after all (unless your playing totally random games)

Did you win the lottery?

Did you win in a casino?

Did you make money playing cards among your "acquaintances".

What good came out of cards?

Avatar of Pope-of-bishops
long_quach wrote:
Pope-of-bishops wrote:

After all, older versions of chess did have dice

That is apocryphal. (That is not true).

https://en.wikipedia.org/wiki/History_of_chess#%3A%7E%3Atext%3DIntroduced_into_the_Iberian_Peninsula%2Ceffective_rules%2C_and_charismatic_players.?wprov=sfla1

"Some people formerly played chess using a die to decide which piece to move. There was an unproven theory that chess started as this dice-chess"

Avatar of Pope-of-bishops
long_quach wrote:
Pope-of-bishops wrote:
 

Ok what do we mean by good here?

In cards there is a strategy after all (unless your playing totally random games)

Did you win the lottery?

Did you win in a casino?

Did you make money playing cards among your "acquaintances".

What good came out of cards?

I don't Make money, but I have fun.

Cards are good because they are entertaining.

Avatar of long_quach
Pope-of-bishops wrote:

"Some people formerly played chess using a die to decide which piece to move. There was an unproven theory that chess started as this dice-chess"

Historical scholarship error.

If we have total amnesia and excavate this set 1,000 years in the future, we would think chess was played with dice too, because this set comes of dice for backgammon.

What people excavated were multi-games equipment, just like this.

Don't just regurgitate 'facts". Think.

Avatar of long_quach

Chess with dice was not invented until Kriegspiel.