#1 rule for competition - bid your hand once, as high as possible!
With big trump fits, bid it up, quickly and confidently.
Both players did this very nicely, north showed a weak jump overcall - he had the trump texture and the shapely hand to justify it, despite only having 6 trumps (1462 shape).
South's bid is great, a lot of people would hesitate, not sure what to do, but south knew with a big trump fit to put the pressure on the opponents.
Overall the score was 5♦ -1, when 4♠ is making the other way. Their positive quick auction led to them not even getting doubled.
The most important signals
Double or bid?
Bid as high as possible!
Defending against a multi 2♦
Transfer or not?
Nv compete
How strong vulnerable?
Preempt suit quality
6322 and 7222
2♣ opening
Doubleton lead
Passive lead
When to lead active
1N with 5422
Takeout double
Negative double
Splinters
Competing partscore
Try not double
Ace Ace King
2 level overcall
Lead Trumps #1
Lead Trumps #2
7 card GOOD suit
To open or not, pre-empt or not
Let the opponents play when they are misfitting
The strongest hand
Be practical
Losing trick count bidding
Favourable vulnerability
Be a nuisance
Big trump fits
What does 3♥ show?