FAQ

More answers are in the FAQ of the rules. Not listed? Ask in Q&A.

Is there check or checkmate? No: you win by capturing the king. The king-danger ring (red at 100 %) and a confirmation stop you from leaving your king hanging by accident. If every move you could make leaves your king to be captured for certain, the game ends at once and you lose: your king cannot escape.

Why didn't my piece move? The result was Missed: the piece wasn't really on the square you moved it from, its path was blocked, or your own piece turned out to be on the target. The turn still counts, and the board updates to what you learned.

My rook is suddenly in two places, but I never split it! It slid past a square where another piece might have been. Where that piece was in the way, the rook stayed; where it wasn't, the rook arrived. The two pieces are now linked.

Can a ghost capture? Yes, but only if it is really there: a 50 % part captures with a 50 % chance. To capture for certain, merge its parts onto the target.

Why can't I split this piece? The tooltip tells you: it is a king or a pawn, a target square is not certainly empty, no possibility has both paths clear, the piece would be on more than 4 squares, or your budget is full.

Can I get a new roll by undoing my move? No. In local games the same move in the same position always gets the same result.

Are the online rolls fair? The server draws each roll only when the move is applied, so nobody can look it up in advance, and every move is chained to the previous one, so later changes show up as a warning. Whoever runs the server still has to be trusted; that is why administrators carry an "admin" badge in rated games.

Why don't I see hints in my online game? For fair play, the coach, hints and analysis are off in your online games that are still running. They come back when the game ends.

Does it cost anything? Quantum Chess is free and open source (AGPL-3.0). Only an AI opponent may cost money, if you use a paid AI provider.

Where are my games against the computer? Under On this device. They are stored in your browser, so they don't show on another device or in another browser.