Thursday, May 13, 2010

too subtle to matter?

L. has only one die he can use, and normally, in this circumstance, you just take the largest think you can, reroll and hope for the best -- but would it make sense here to take the 6 sided die with value 5 instead?

Is the gain illusory? is it microscopic?

Viewing Game #696251
Tournament Legal challenge, copying communication from game 695958
This game was last modified on Thu May 13, 2010 12:05:02

* Next Turn * Player: Limax *Wombat* *Is a MAN* *Fanatic* * Next Turn *
Button Man: Iago    Score: 28 (-20 sides)   Rounds Won/Lost/Tied: 1 / 1 / 1 (out of 3 round(s))
Captured Dice: 10-sided die

Dice 20-sided dieX Swing
(with 16 sides)
Value 102
Dice 6-sided die6-sided die20-sided die4-sided die
Value 65114
Player: ElihuRoot *Dead Dude* *Fanatic*
Button Man: Tuxedo Mask    Score: 58 (20 sides)   Rounds Won/Lost/Tied: 1 / 1 / 1
Captured Dice: 20-sided die, 20-sided die

2 comments:

jimmosk said...

It's not illusory, but it's microscopic. Limax's [16] will get taken, so even to eke out a tie will require L to take all of Elihu's dice.

Just to make the math tractable, assume Elihu's dice always reroll to the same value they had previously.

If L captures the [6]-showing-5, that ekeing happens 7 times out of 20, then 13 times out of 20, then 16 times out of 20. Total chance of survival (7/20)*(13/20)*(16/20) = 18.2%

If L captures the [6]-showing-6, that ekeing happens 6 times out of 20, then 14 times out of 20, then 16 times out of 20. Total chance of survival (6/20)*(14/20)*(16/20) = 16.8%

Maximize your chances by taking the 5.

Ted said...

Right, your numbers are a bit off because of your simplification, but the general trend is right.
If you take the die with value 6, the exact chance of success is 14.21%, but if you take the die with value 5, the chance of success is 16.23%. [and, for comparison,
if you take the 4-sided die, the chance of success is 15.13% -- suboptimal, but still better than taking the die with value 6 !]

Only 2% [ok, 2.02%], but you might as well have the extra chance of winning, no? That's more than the house advantage in craps and it does add up.