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The rule of 15 is a guideline of opening 1 at the fourth seat. Add the number of HCPs and the number of s, if it is at least 15, open 1. This rule comes from the fact that is the highest suit, thus opening it prevents the opponents coming in cheaply.

For example, the following hands qualify for a 1 opening at the fourth seat under this rule:

A732
KQ3
952
Q76

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