When to Pass #001 – Passing with the best hand at the table is really, really, really hard. But remember, bidding is about describing your hand to your partner or as Al Roth says bidding is "the art of painting a bridge hand." After West opens 1♦, how can North best describe this hand?
After West open's 1 ♦, what call can North make that is NOT, at best, a misrepresentation ? The choices seem to be 1 NT, Double, 1 ♠, 2 ♣, PASS ... any others?
1 NT – While North has a perfect 1 NT opening bid, as an overcall, North does not have a diamond stopper. This is a really bad choice, the contract could end up in 3 NT not making (as E/W run off 7-diamond tricks) when game otherwise in a suit contract is assured.
Double – While some partnerships might make takeout doubles to show opening values regardless of shape, a Minimum Offshape Takeout Double (Savannah double), in modern bridge this is just WRONG! What would North do after a takeout double, if partner jumps to 4 ♥? So what about doubling with the plan on rebidding ... first, North only has 15 hcp and second, what would North rebid?
1S or 2C – North doesn't have a 5-card suit in either spades or clubs. Sure North would like partner to lead one of these suits if on opening lead, but partner will expect a different hand thinking if not saying out loud WWYT (what were you thinking).
PASS – Passing with the best hand at the table seems to be the best option. The bidding should come back around, and if partner does not have enough values to balance over 1 ♦, then PASS was the right option all along.