You can bad bidding equalize by excellent play but not vice versa..
Bidding is only of secondary importance. The most important is to play
the hand and to defend.
I need most of my brain to memorize cards, count points and distribution.
You defend twice, while you once play a hand. Therefore defense
is the most important but also the most difficult issue in bridge. And
you'll only become a good defender, if you are a very good declarer.
The art of defending is first to count and imagine and second