Friday, February 19, 2010

Again, a simple mate-in-two

Easy to do the computation -- but what's your instinct?

Viewing Game #689711

Tournament Legal challenge, copying communication from game 689206
This game was last modified on Fri Feb 19, 2010 14:12:59

* Next Turn * Player: Russian *2^12th game cookie* *Ngozi's Disciple* * Next Turn *
Button Man: Dirgo Score: 80 (6.6 sides) Rounds Won/Lost/Tied: 2 / 2 / 0 (out of 3 round(s))
Captured Dice: 30-sided die, 30-sided die
Dice20-sided die20-sided die
Value2012

Dice30-sided dieOption 6/30
(with 30 sides)
Value1310
Player: ElihuRoot *Dead Dude* *Fanatic*
Button Man: Vincent Score: 70 (-6.6 sides) Rounds Won/Lost/Tied: 2 / 2 / 0
Captured Dice: X Swing 20-sided die, 20-sided die

4 comments:

James said...

OK, without doing the computation, I actually have no instinctual reaction to this. I really don't know which is better.

Someone feel like showing the calculation? (I'm a tad too lazy at the moment.)

Unknown said...

Instinct says take the 10 with my 12. But instinct also says "don't trust instinct", so I'd do the calculation first.

Ted said...

CASE 1: R. takes my val 13 with his val 20; 1/2 the time he wins outright rolling 11 or higher. the other half the time I capture him and he still has 12/30 = 40% chance that I roll 12 or lower. So he will win with probability .5 + .5*.4 = 70% chance.

case 2: R. takes my val 10 with his val 12: only 7/20 = 35% chance of winning outright, but the other 65%, he still has 20/30 chance that I'll reroll lower than 20.
.35 + .65*(2/3) = 47/60 = 78.333%

easier to see from my perspective:
case 1: I win with probability
10/20*18/30 = 180/600

case 2: I win with probability
13/20 * 10/30 = 130/600

James said...

Well, I feel justified in having no obvious hunch, since there is not a great difference in probabilities. :)