Multi-player Elimination Logic

Core Rules

In 4-player Vortex Chess, players are eliminated under two conditions:

1. King Capture: Their king is physically captured by another piece.
2. Stalemate/Checkmate: They have no legal moves on their turn.

Chained Eliminations

Elimination is a recursive process. When it is a player’s turn, the engine checks if they have any legal moves. If they don’t, they are eliminated, and the engine immediately checks the next player’s legal moves.

This can lead to “chained eliminations” where multiple players are knocked out in a single turn cycle.

State Transitions

When a player is eliminated:

• isEliminated[color] is set to true.
• All pieces belonging to that color are removed from the board (poofPieces).
• The turn count is updated to the next active player.
• The FEN string is updated to reflect the new board state.