Calculating Pearson Points is easy. Add your high card points and the number of spades in your hand. If the total is 15 or more, then you should open the bidding. if the total is 14 or less, then you should pass the hand out.
In my experience, Pearson Points are pretty reliable. They are predicated on the idea that when the honor cards are evenly distributed around the table, the best suit to own is spades because you can outbid the opponents at the 1- or 2-level. Hands short in spades are worth less because of the increased probability of the opponents bidding and landing in their own spade contract.
This hand has 10 HCP + 5 spades = 15 Pearson Points. Open the bidding in 4th seat with 1.
12 HCP + 2 spades = 14 Pearson Points. Pass.
12 HCP + 3 spades = 15 Pearson Points. However, rules are made to be broken. I'd pass because the high cards are soft (primarily queens and jacks), and because the short major suits make it likely that the opponents will compete successfully in hearts or spades.
Pearson Points are named for their American inventor Don Pearson.
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