“Bid notrumps with mettle, then head for the kettle”

This article is taken from Andrew's Rules Acronyms & Ditties book, available here

Bid notrumps with courage when you have the appropriate hand. Having done so, you have described your hand and can let partner choose the contract. Because you are unlikely to make even one further bid, you can go to the kitchen and boil the kettle, returning at the end of the auction should you be required to declare/defend.
Open 1 NT with each of these hands:

All four are balanced (no void, no singleton and not more than one doubleton) with 12-14 points.

You do not need stoppers in all suits and can have a five-card suit, even a five-card major suit. I realise this latter point is somewhat contentious (getting less so) but that is the modern game.

Put simply, opening 1 NT is the easy life. Opening one-of-a-suit requires you to make a rebid over partner’s change of suit response; far better to open 1 NT and get the hand off your chest (then disappear to the kitchen).

You would open 2 NT to show a balanced 20- 22 point hand. If partner jumped to 4 ♠ you would pass. Yes – whether your spades were ♠ 32 or ♠ AKQJ. Partner knows what you have; you do not know what partner has. Partner is wearing the captain’s hat; you are in the kitchen. Take our deal.

Even 4 ♥ was a big challenge on West’s ♠ Q lead. Cover with ♠ K and East can win ♠ A, lead back ♠ 2 to ♠ 10, whereupon a club switch through ♣ AQ9 would secure two club tricks for the defence. Down one.

♠ Q lead marks ♠ A with East (West would not lead away from an ace at trick one). Duck in dummy (key play). Say West finds the club switch (best). Rise with ♣ A, draw trumps, play ♦ AK and ruff ♦ 9, then lead ♠ 8 to ♠ K. East wins ♠ A but is endplayed, forced to lead from ♣ KJ around to ♣ Q or lead a spade/diamond allowing you to trump in one hand and throw a club from the other. 10 tricks and game made.