@qchesscom

Quantum chess for the masses

q-chess.com
Joined August 2025
  • Tweets42
  • Following60
  • Followers8
20Media
Here's Q-Chess, a website to play quantum chess, online and free. We just launched, go have a look - q-chess.com/
1
205
Here's a curious illustration to how #quantum #chess introduces tactics not known in classic chess - in this case allowing me to win a game I was absolutely clearly losing. Here's what is going on:
1
1
92
more replies
This was, in a way, a desperate move, and only with quite some luck I got away with it (the opponent missing the right move, and the 50% chance of my king being in b2) - but that's how quantum tactics work.
1
71
Tune in for more, there's plenty tactic insanity the game makes possible. #quantum #chess
31
In a sudden change of heart, we opened all features to all users. You don't need to register anymore to play against other people - including invitations and tournaments. Go nuts. #quantum #chess
45
Here's an interesting case of heavy entanglement, resolved in an instant after a single move. Notice how all copies of the queen disappear, but also all rooks get massively re-adjusted as well as the pawns at e4 and e5.
74
Quantum Chess tournaments! The tournaments are now finally online - every 3 hours, there's a Swiss tournament scheduled with a 5-minute time control. #quantum #chess
1
59
While it's fun and all, they also solve the problem of never finding an opponent to play against. Now you know when to arrive to have an opponent.
1
38
And here's a link for you, of course - q-chess.com/tournaments
37
More about castling in quantum chess. Not all rules of #quantum #chess are the same in this regard, but we do allow quantum moves when castling. You can make quite a dramatic change on the board when doing that, but there's also some less then obvious limitations.
1
47
more replies
This is not too obvious, but once the move to g1 is made, f1 is occupied with the rook, and the king wouldn't be able to move there. Same on the other side.
1
27
You have many other options though. The most fun option though is to choose c1 as the second target square, and castle to both sides at once. You end up with two copies of the king, safely stowed away and protected on both sides. With a degree of probability, that is.
24
Some details about the most romantic concept in #quantum #chess - the entanglement. In the game, its meaning is actually rather opposite from the one it has in quantum mechanics.
1
2
67
more replies
This, too, is a backward entanglement - if this bishop actually does sit at e2, the queen will find it never made the jump, and isn't where it appears to be.
1
30
This goes both ways, too. If at a later point we establish that the queen at h5 does exist, the bishop at e2 will be shown to not exist, which will then show that the one at c4 does exist, and one single move of that queen will change the board quite a lot.
30
Load more