Hand evaluation - Points count

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You are the declarer, after an overcall
The RHO (Right Hand Opponent) just lead Do not touch a card at the dummy before you have :

Calculated the total points count of your camp
You know the minimum HCP count of the opp that opened ! You almost know the point count of each hand ...
Now, coungt the winning tricks, your losers and then decide on the right way to play that board!