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There are a couple of Norwegian variations:
"Sudden Death"
This is played as normal backgammon, except that the first
player to hit a shot wins the game.
If contact is broken without any hitting, it's a draw.
This is a very good gambling game, but should be played for
low stakes, as the games are fast and the cube spins fast too.
Normally it's a double/take if one player leaves a direct shot.
"Woodpecker"
A two-stage doubling rule.
After taking a cube, the player puts the cube on his left side.
As long as it's on his left, his opponent can double again
(the woodpecker). If he takes this too, he puts the cube
on his right hand side, which means that he owns it.
So the cube has 5 states instead of just 3:
-center
-blacks left side
-blacks right side
-whites left side
-whites right side
A player can double unless the cube is on his opponent's right side.
This rule makes the game a lot harder, as well as jacking up the stakes.
In general I think you should give the non-woodpecker double with
as little as 0.25 equity (5-to-3-favourite).
"Gerhardsen"
After the game the winner must roll his dice, and if they show
21, the result is inverted.
"Gerhardsen revenge"
If a player loses to the Gerhardsen rule, the opponent is the new winner,
and must roll a Gerhardsen roll to avoid 21.
This goes on until one player rolls something different from 21.
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