Each player starts with a shuffled stack of all cards from one suit (or two for a longer game). Players deal cards face-down into their own rows of front and back "trenches". A player may peek at his own cards anytime. A turn consists of one of three actions: Reveal a card in the opponent's trenches. Swap positions of two neighboring allied cards. Attack: Flip two directly opposing cards. Discard the weaker card, and return the stronger card to the owning player. Each player slides a card from their back trench into the spot emptied by the attack and lays a replacement card in the back trench. A player left with only three cards loses.

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