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# Snowie terminology

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### bshe...@hasbro.com

Sep 21, 1998, 3:00:00 AM9/21/98
to
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?

What does the abbreviation "Nb" stand for?

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

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

Brian Sheppard

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### Alexander Nitschke

Sep 21, 1998, 3:00:00 AM9/21/98
to bshe...@hasbro.com
bshe...@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.