Monster Chess is a variant where White gets to make two moves every turn, but has just a King and four Pawns. Meanwhile Black operates like Standard Chess, and moves just once per turn with a normal starting set of pieces. The initial starting position is as shown:

Rules

• White must execute two moves in their turn. White can do this by moving a piece twice or two pieces once.
• The White King may be in check after White's first move, provided that White can execute a second move that leaves them out of check.
• Otherwise, Standard Chess rules apply.
• A King is in check (highlighted in red) if it could be captured on the next turn. This definition of check applies when determining if Castling is legal (Black can't castle when in check or through a checkable square).
• The White King can capture the Black King by virtue of the above rules.
• En passant is valid for Black on a Pawn moved in either of White's moves on their previous turn.
• An en passant capture made by White must be executed in the first move of White's turn.