It is tempting to play with toys
Sam Levenson, a humorist and media man who died in 1980, said, “The simplest toy, one that even the youngest child can operate, is called a grandparent.” That is so true. But it is fun playing with grandchildren, especially since you can always give them back to their parents.
Bridge players have toys -- their bidding conventions. The biggest problem is that less-experienced players love to employ them at every opportunity, even when a hand does not qualify.
After North rebid one no-trump to show 12-14 points, South used New Minor Forcing, which in theory promised at least game-invitational strength. He should have rebid a nonforcing two hearts, which North would have corrected to two spades.
When South used NMF, North unnecessarily jumped to four spades. She should have settled for two spades, but if she liked her hand that much, she could have rebid three spades. This would have given South a chance to suggest a slam if he had a sufficiently strong hand. Also, note that NMF does not guarantee a five-card spade suit. South might have four spades and a big fit with opener’s first-bid suit, so he could be thinking about game or slam in that suit. The defenders played accurately against four spades. West found the best lead of the heart nine. East won with her queen, and South cleverly dropped his 10. This persuaded East to shift to a trump, but West, after winning with the king, led his second heart. Even though South smoothly played his jack under the ace, East gave her partner a heart ruff, and the club king later resulted in down two.