Have you joined the 2017 Secret Cthanta yet?
For the last 10 years or so we have played an annual game of Battle Chess during our Winter Camp event. The basic idea is to play a life-sized game with the players serving as pieces. During our ten year evolution, we have made pretty good rules by evolving the game each year.
The basic rule are simple. Each player serves as one of the chess pieces. If there shortages we use markers for the missing pieces, usually pawns. If a pawn is attacked, then the "owner" of the pawn fights on its behalf. The players take their positions on a chessboard which typically has 2' squares. We indicate black and white by removing snow from the black squares.
Each side's king is the caller for that team. Pieces move normally. If a piece moves to make a capture, the defending piece gets to choose the type of contest they will have. Only the winner remains on the board. The loser is captured and removed from the board normally.
Typically, the defender can choose either physical or mental as the contest. Mental has ranged from scout trivia to regular trivia from a trivia game to simple math questions.
The physical challenge has always been the same. Both players move to the "Battle Square" a fifteen foot square. The contestants try to either push each other out of the square or force the other one to the ground. First one out or on the ground loses.
Play continues until the one teams king is captured.
In recent years we have added "Lifelines" which allow each team to swap the players for two pieces. So if an older scout is making short work of a bunch of younger scouts, the king can substitute a different player for that piece. The substituted players change pieces permanently, so if you make Ron the Queen take the place of Mark the Bishop, Ron is now the bishop.
We have had a lot of fun with this variant over the years and I think many groups could play it.