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## [Bug-gnubg] Re: Bug-gnubg Digest, Vol 97, Issue 5

 From: Frank Berger Subject: [Bug-gnubg] Re: Bug-gnubg Digest, Vol 97, Issue 5 Date: Fri, 17 Dec 2010 18:59:28 +0100

```> Maybe I'm missing something here, but gnubg's luck figures apply to
> each player's rolls separately. Rolling a joker for player A can add
> 3% to his luck, it does not take 3% away from his opponent's luck, so
> there's no reason to assume they should be equal.  One player, playing
> perfectly, could have a fairly low luck rating if the spread in
> possible equities is small for all his rolls. Another player could
> have a high luck rating if he rolls the least of all evil rolls (the
> average roll leaves two blots, his roll only leaves one). He's lucky,
> but he's not all that lucky, he still has a blot. Luck is the measure
> of getting the most favourable of all possible rolls, not a measure of
> game winning chances in and of themselves.

the luck of the player doesn't have to be the same, but the addition of the
luck of both players could be calculated, in a perfect world,
by the skill of the players. Assume a game is a random walk on a line, where
the players start a certain position. Let's say you win against me in 52% of
the games. To win (the 1-pt match) you need 0.48 luck to move from .52 to 1.0
whereas I need .52 luck to go from .52 to 1.0, therefore the the sum of your
luck - my luck should be .52 if I win and .48 if you win.

```