A thumb war (also called thumb wrestling, pea-knuckle or pea-knuckle war in New Zealand) is a game played by two players in which the thumbs are used to simulate fighting. The objective of the game is to pin the opponent's thumb, often to a count of ten. The San Francisco Chronicle called the game 'the miniature golf of martial sports.' The players face each other and each holds out their left hand or right hand in a 'thumbs up', and they link hands such that each player's fingers curl around the other player's fingers. Players may not use any of the fingers except the thumb to pin down their opponent's thumb. Gameplay has several tactics such as 'playing possum', aiming for the knuckle rather than the nail for a pin, going for a quick strike, and waiting for one's opponent to tire. Variations include making the thumbs 'bow', 'kiss', or both before warring, and to war with both hands at once; or sneak attacks, which involve using your pointer finger to take over the opponent. Players may also engage in the Rabbit Hole maneuver, or ducking their thumb down into their own palm, to escape imminent defeat. These additions are optional and do not need to be included into the rules of play. (Source: Wikipedia.org, CC BY-SA)