Starting position: All 32 pieces are "?" (superposition). Each side has the standard chess composition (8 Pawns, 2 Rooks, 2 Knights, 2 Bishops, 1 Queen, 1 King), but the placement across the 16 home squares is completely random each game — shuffled independently for each color.

Moving: Selecting a piece highlights only the legal squares for its true identity (the icon stays hidden).

Observation: The first time a piece moves, its identity is revealed.

Decoherence: Moving a revealed piece again has a chance (see slider) of randomly changing it into a different piece type.

Quantum tunneling: After a move, one of your other pieces may randomly teleport to an empty square.

Entanglement: Two random pieces on the board may mirror the same move offset as the piece you just moved (captures can happen this way too).

Win condition: Your opponent loses when they have zero Kings left on the board — whether by capture or by decoherence.