Snowie

Forum Archive : Snowie

 Terminology

 From: Alexander Nitschke Address: nits1431@mailszrz.zrz.tu-berlin.de Date: 21 September 1998 Subject: Re: Snowie terminology Forum: rec.games.backgammon Google: 3606A517.B5D20727@mailszrz.zrz.tu-berlin.de

```bsheppard@hasbro.com wrote:
> The following are the first few lines of a typical Snowie game summary:
>
>                               Castro          Salo
>  Error rate                    1.282         0.695
>  Nb errors (Nb blunders)       2 (2)         1 (1)
>  Luck rate (Nb joker)          3.752 (5)     -3.752 (2)
>  Nb wrong double    1 (DP 12.25 TG 0.00)     0 (DP 0.00 TG 0.00)
>
> The term "Error rate" implies a formula of the form "Error-Measure
> divided by Some-Type-Of-Unit." Can anyone tell me the actual formula?

The error rate measures only checker play errors and is calculated as
follows:
A checker play error occurs when a move is played which has lower equity
("match score adjusted equity", see another post) than the best move.
The difference is the value of the error. The sum of all checker play
errors (in a game or the whole match) id then divided through the number
of unforced moves (all rolls with at least two legal moves).

> What does the abbreviation "Nb" stand for?

Number. The number of blunders is always smaller or the same as the
number of errors, since they are included.

> Luck rate: what does this mean? (And why should I care?)

Each roll is good for one player or the other. How good is measured in
equity units deviation from the average roll. These equity deviation are
summed up from the viewpoint of one player and then divided through the
total number of rolls in the game or match. You shouldn't care much

> What do "DP" and "TG" and stand for?

DP: Wrong double around doubling point.
TG: Wrong double around too good point.

> Brian Sheppard

Best greetings,
Alexander Nitschke
```

### Snowie

Announcement  (Olivier Egger, Apr 1998)
Checker-play-according-to-score bug  (Peter Schneider+, June 2001)
Error rates  (Gregg Cattanach, Oct 2000)
Hints and questions  (Achim Müller+, Aug 1998)
Luck calculation  (Gregg Cattanach+, Dec 1999)
Questions and answers  (David Montgomery, Dec 1998)
Running in low priority  (lmfback+, Oct 2004)
Snowie 4.0  (SnowieGroup Info, Oct 2002)
Snowie 4.3 update  (Gregg Cattanach, July 2005)
Snowie cube evaluation  (Kit Woolsey, Sept 2007)
Snowie vs GNU  (Stanley E. Richards+, Oct 2005)
Snowie vs. Jellyfish  (Mark Driver, Apr 2001)
Snowie vs. Jellyfish  (Daniel Murphy, Oct 2000)
Snowie vs. Jellyfish  (Gregg Cattanach+, Sept 2000)
Snowie vs. Jellyfish  (Wayne Crookes, Jan 1999)
Snowie vs. Jellyfish  (Kenneth M. Arnold+, May 1998)
Terminology  (Alexander Nitschke, Sept 1998)
Using rollouts  (Michael J. Zehr+, Oct 1998)