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## Setup and Rule Diagrams

• PowerScore Staff
• Posts: 8203
• Joined: Feb 02, 2011
#44161
Setup and Rule Diagram Explanation

This is a Grouping: Undefined game.

At first this game appears to be a fairly standard Grouping game, but the test makers throw a slight twist into the mix with the last rule that specifies the number of Os selected. Fortunately, this is the only numerical rule, and thus it is easy to remember throughout the game.

Because there is no specified number of fish selected, there is no representation for the group.

The seven rules can be diagrammed as follows:
Because of the large number of rules, there are also a large number of inferences:

• 1. In the rule diagrams, the fifth and sixth rules were combined to create the double-arrow representation, which perfectly captures the relationship between O and P.

2. J and L are both randoms, which in an Undefined game means that their appearance has no effect unless a number is specified for the group. Hence, your focus in this game should be almost entirely on K, M, N, O and P.

Here is the complete setup for the game:
Echx73
• Posts: 36
• Joined: Nov 11, 2015
#23867
On this question there are a whole host of rules which allows multiple inferences to be made. Your book LG Setup Encyclopedia on page364 shows that if there is P there cannot be K and vice-versa. How can one infer this? Thank you!

Eric
Dave Killoran
• PowerScore Staff
• Posts: 4627
• Joined: Mar 25, 2011
#23884
Hi Eric,

Thanks for the question! That inference is drawn from combining the first and sixth rules:

• First rule: K O

Contrapositive of the sixth rule: O P

Combined: K O P
When that is reduced, it turns into K P. This inference ultimately means that K and P cannot be selected together.

Please let me know if that helps. Thanks!

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