Notwithstanding a pretty full array of bidding topics, I haven't devoted much attention to bidding, which make up probably no more than 10% of the entries. I suppose there are several reasons for that, most notably that bidding practices vary greatly from partnership to partnership and are far more subjectively valued than can be said of the cold, unimpeachable facts of 13 cards per hand and 13 cards per suit that underlie strong declarer play.

This contrast -- between the unimpeachable hierarchy of the cards (along with trump beating any side-suit) and the "waywardness", as it were, of bidding choices, with the viability depending on the point count (or more broadly the effectiveness of the cards dealt), the scoring system, the vulnerability, the location of the opponents' honors, the distribution in the opponents' hands, and lastly we might say, the skill of declarer once play starts -- this contrast gives rise to a fear of being swayed by hindsight. After all, though hindsight must be guarded against in analyzing the play of the hand, I can by and large point out not only what works but how a declarer or defender should've known or strongly suspected a certain line. And if I can't, say there's a two-way finesse for a J or Q, I don't take up those hands. But bidding, which allows scope for the mildly conservative to the mildly aggressive, and which might turn out badly for any of several reasons, and which I already know went awry when I start to discuss a hand, allows and invites a fall into hindsight.

So I haven't concentrated a whole lot on bidding. But certain mishaps, certain inexcusable practices, have a way of recurring. And I have finally decided to start categorizing them and giving illustrations. To be sure, I've already instituted a couple of them, such as sacrifice bidding and a pronounced tendency toward overbidding in competition than when there's not a peep from the other guys.

I will start with links to those I already have, and from there add new ones that I come across.

Wrecklessness in Competiton

Sacrifice Bidding

Bidding the Same Values Twice (or more)