AL78, on 2021-November-26, 16:36, said:
I understand your logic. I can appreciate the weak two style overcall if opponents have shown at least game invitational strength with a fit (so you have a fit your way as well) and you want to get a moderate six card major in now or never just in case (partner can work out you are very limited and won't hang you), but in the OP's hand, after 1♠ - 1NT it isn't obvious the hand is anything more than a part score, and a misfitting partscore, so it looks to me to be a bit more dangerous, finding partner with a small singleton in your suit and opponents swinging the axe for example.
Treating an overcall of 2M after 1M P 1N P (obviously the other major, lol) as a weak two makes a great deal of sense.
The point is to try to be difficult to play against. This is perhaps more important in strong fields than for the average player, since strong opps will usually do very well if left to their own devices.however, less expert opps will often have even more trouble handling interference than do experts, so it’s worth doing against almost all opponents.
Spades are, as always, more effective.
Consider 1H P 1N P
Whether 1N is non-forcing or semi-forcing or forcing, opener usually has a straightforward decision. Many good players have science here, such as BART, but even those who don’t rarely have problems.
Change it by sticking in a 2S overcall and now problems often ensue.
Even after 1m P 1N a weak two type of 2M can wreak havoc, but it’s not unreasonable to require a better hand here.
Yes, you will miss the occasional game, but advancer doesn’t have to pass. As for going for a number, that’s possible but I can’t recall the last time it happened.
Most good players use double by opener as takeout, and responder will rarely have a hand on which he wants to sit when under declarer. About the only time one is likely to be nailed, and likely is a relative term, would be 1S P 1N 2H P P x….all pass.
So maybe every 10 times one bids one might regret it, but in the meantime you’ve created problems for them that simply don’t exist if you pass.
In the old days, when I was learning, the mantra was ‘avoid disasters’
Nowadays it’s more ‘create opportunities for them to have disasters’, even at the expense of the occasional self-inflicted disaster
'one of the great markers of the advance of human kindness is the howls you will hear from the Men of God' Johann Hari