I always used to lose matches like this.
No Christmas truce for them! Charge!

Red Scare chess: if two pawns remain deadlocked for four consecutive turns, both pawns are promoted to red queens which are controlled by neither player. After each player’s turn, one red queen moves. Red queens can:

  • capture kings
  • capture non-pawns
  • convert an adjacent pawn to red queens

If a king is captured by a red piece, all their remaining pieces become red queens. the other player must eliminate all red pieces to win the game. It is possible for both players to lose.