East is the dealer. The auction:
First round: East opens 1♣. South overcalls 1♥. West doubles (negative double). North bids 2♦. Second round: East rebids 2♠. South rebids 3♥. All pass
3♥ goes down -3 for -300.
What are South’s 2 main mistakes?
Scroll down for the full hand, a suggestion/solution and/or explanation
Gino's Suggestion and a Short Explanation
South's main mistake is overcalling 1♥. South should have used a weak jump overcall in the first round (2♥).
Once South decided to overcall 1♥, he/she does not hold sufficient playing strength to compete to 3♥. Initially making the correct bid of 2♥ would advertise HCP and distribution, preventing any difficult decision later in the auction.