開局局面
You start from the standard setup and see the squares your pieces could move to, plus the squares they stand on. Everything else is fog. White's view, the true board, and Black's view:
Vision is field of fire, recomputed after every move: open a line, advance a pawn, or drop a piece and what you see changes at once. It works exactly as in dark chess.
Captures flip into your hand
Capture a piece and it does not leave the game: it switches to your color and enters your hand, a private reserve you spend by dropping. A captured rook is a rook in hand; a promoted pawn reverts, so a captured promoted queen gives you a pawn, not a queen. The king is never taken into a hand.
This is where fog bites. Open crazyhouse lays both reserves face-up; here you see only your own. You can still read the enemy reserve indirectly, since every piece of yours that vanishes has been captured into it, but you never see it laid out, and nothing tells you when a held piece comes back. The dangerous case is a drop into your fog: it lands fully real and sits there unseen until one of your pieces looks at the square.
Dropping a piece
Instead of moving a piece on the board, you may drop one from your hand onto an empty square. Standard crazyhouse rules hold: no pawn on the first or eighth rank, and the dropped piece is live at once, free to capture or take the king next move. With no checkmate under fog, the ban on dropping a pawn for mate does not apply.
Into vision. Dropping onto a square you can see is an ordinary placement.
Into the fog. You may also drop onto a square you cannot see, as long as it is truly empty. The piece lands, fully real, and stays invisible to your opponent until one of their pieces reaches it. A knight can appear deep in enemy territory with no warning.
A bounced drop. If the hidden square already holds a piece, the drop is illegal and bounces: nothing moves, your hand is intact, and it is still your turn. The rejection is information, you now know a piece sits there, though not what it is. Your client always offers fogged squares as drop targets, so the offer never reveals which are occupied; you learn that only by trying.
勝負條件：吃王
Capture the king to win. There is no check and no checkmate: the server never warns you, and will let you move into danger or leave a threat standing. You read threats from what your own pieces see, and a piece dropped into the fog is the one you will not see coming.
和棋
The game draws on threefold repetition of the true position and on the 50-move rule, both judged from the true board, not either player's view. A drop adds material and resets the 50-move count, like a pawn move or a capture. There is no stalemate draw and no insufficient-material draw.
對弈狀態
Dark Crazyhouse is in development on Mistboard and not playable yet. There is no set release date.