Within the framework of the Q2B 2020 virtual conference on quantum computing, for the first time in history, an official "Quantum Chess" tournament was held. The winner was Alexander Kubica from Amazon, who beat Doug Strain from Google. The latter did not have enough time allotted to carry out the necessary calculations.
The author of this game is Chris Cantwell of Quantum Realm Games, who invented it when he was studying quantum mechanics as a graduate student. He wanted to transfer the complex principles of quantum physics to the real world, adapting them for some practical application, but preserving the very quantum nature. The choice fell on chess as a game where there are an almost infinite number of situations on the field, so the player must be able to predict events and take into account the various probabilities of their occurrence. Just like in quantum computing.
In this game, the rules for pawns remained unchanged, but the pieces were given the opportunity to make "quantum moves" along with the usual ones. For example, you can move the queen to superposition when it is 50% likely to be on any of the two cells. It looks as if it was moved on one game board, and on the other it remained in place, but since the player cannot see two boards at once, everything is displayed by conventional signs on one. This is the difficulty for the opponent - try to figure out which of the two queens in superposition the opponent will move to the next move, and which one will disappear?
To navigate quantum chess, it is not enough to know the principles of superposition, entanglement and interference, you need to develop intuitive thinking about what is happening in the quantum multi-universe. As the author of the game himself notes, he deliberately created it complex, focused on intellectuals and people with developed abstract thinking. Like physicist Stephen Hawking, actor Paul Rudd, and director Alex Winter, who recorded a 2016 commercial to promote quantum chess.