Chess Studio — Firebase 2-player

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Drag pieces from here to the board. Right-click on board to remove a piece.

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FEN:

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Rules (short):

Standard chess moves — validated by chess.js.
Castling, en-passant, promotion are supported (promotion auto-queen).
To play online: Create a room, share Room ID. First joiner becomes White, second becomes Black. Extra joiners observe.

⚠️ Replace firebaseConfig in app.js with your project's config. For testing you can allow open Realtime DB rules but secure them before production.