The Supplant rule: capture a piece, become that piece.

Your pawn takes a knight and your pawn is now a knight, sitting on that square, moving like a knight. Kings are exempt. Everything else is the chess you know.

That single change rewrites the game from move one. Every trade transforms both sides of the board. Your queen can take a pawn and become one. A hanging bishop is an offer as much as it is material. Sometimes the strongest move on the board is forcing your opponent to capture something.

Built for players.

Supplant is for people who love chess and want something fresh. The same board, the same standard rules underneath, the same expectation that the interface gets out of your way.

• Ranked: a real ladder with real ratings. Climb it.
  
• Casual: unranked play when you want to experiment without the cost.
  
• Bots: opponents across a range of strengths, for practice or for punishment.
  
• Puzzles: an endlessly growing library, mined automatically from real games played on the platform. Play as many as you want, whenever you want.
  
• Analysis: walk back through any game, branch off, test the line you should have played.

The chess you know still applies. What changes is what everything is worth, and when.