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My point of view is you need to comment professional teacher, no need to be bridge teacher. I think Ben can do excelent this job, because he not only play best bridge, but know WHY play so and can explain it right, because of great practice

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Thank you for the kind words, Misho. Although I am not all that sure I would make a good commentator, I agree that Fred does an excellent job when he comments.
Since you called me out on this issue and suggested that not everyone makes a good commentator, let me suggest what I think makes a good commentor.
1) Familiarity with the bidding systems used.
I have read extensively on numerous bidding systems, but have no real experience playing many of them. So while I could comment of blue club, romex, precision, KS, and 2/1, I would not feel that comfortable discussing ETM victory, polish club, moscito, etc. (I have read a lot on polish club, etm victory, moscito, however).
2) Familarity with the players.
This is helpful, if the commentator can draw upon his experience playing with or against a pair in the analysis of the hands. It also provides the opportuntity for insight into the players habits etc.
3) A good sense of humor
When combined with #2, a good commentator should be able to keep us entertained in the intolerable delays that happen with vugraph events (director calls, breaks, etc).
4) Superior bridge skills
Of course it helps if the commentator knows more about bridge than the audience. It also helps if the commentator understands the level of the audience so he either doesn't talk down to them, or doesn't talk over their heads. I think in the BBO, many in the audience are actually fairly reasonable players, as most of the beginners/novices find it too slow. But still, a commentator probably should be aware that beginners are present. It is also helpful if the commentator could explain why a bid that "novices" or "beginners" or "intermediate" players might make on a particular hand would be wrong.
5) Offer options....and explain why...
Experts disagree on so many bids. A good commentator should look at the problem hand and give a couple likely bids or rebids and start explaining why more than one bid is likely. This is particularily useful if the bidding is slow as it fills time and gives the audience something to ponder. ("25% of the experts with north's hand would bid 2S, but most of the remainder would bid 3S... the 2S bidders would do so because.... ")
6) Finally, a good commentator would also learn when not to comment
This isn't like TV where DEAD AIR is bad. I have witnessed so many vugraphs where the commentors just chatted away like they were at a bar or something, saying nothing of importance. Often talking about things totally unrelated to bridge, or saying something unhelpful like, what kind of bid was that, without explaining why they don't like the bid or what they would suggest instead.
As for me being a good commentor.. I l#2, #3, and #4 would be problems for me, and I have never known when to stop typing, so we can add #6 too. But I would at least explain the options for players as I see it, so I would beat #5 into the ground.
Ben