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All comments by David Levin
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Even top grandmasters might occasionally blunder. Petrosian once overlooked an attack on his queen in a winning position.
July 2
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Nick, how could you omit Basman?
July 2
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“Does anyone know a data structure which is good at exploiting increasing number of cards in a suit becoming equals later in the deal?”

I don't know whether this will help, but I think of a given card as having (1) an original rank, (2) a promoted rank, and (3) an effective rank. Here's a nine-card, single-suit layout showing each card's original rank:

A Q 4
J 9 6 3
8 7
The same layout showing each card's promoted rank:

A K 7
Q J 8 6
10 9
The same layout showing each card's effective rank:

A A 10
K K J 9
Q Q
July 2
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Drat. I was expecting to see interesting auctions or plays.
July 2
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Yet another line is A, A, K. This gains when East was dealt x 432 because Declarer can draw one round of trumps and arrange to ruff two hearts “high.” If the 10 remains outstanding after their heart ruff and one round of trumps, assume West has it and proceed to ruff two hearts.

Added: I'm sorry. I was thinking that North started with two hearts rather than three.
July 2
David Levin edited this comment July 2
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What are their leads? (I'm mainly interested in whether the 3 could be from 985432.)
July 2
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If the A at Trick 2 draws two low ones, I'll then lead a spade toward the king (if East ruffs, the spade finesse is marked), followed by eliminating diamonds and clubs and leading a second trump toward the jack. If West shows out, I'll win and exit with another trump to force an exit to dummy, then lead another spade.
July 2
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Maybe x xxx AQJxxx Kxx was among the earliest hands opened 2 as a diamond preempt?
July 2
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A backgammon player who picks up more than one blot at a time is likely an octopus.
July 1
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The kibitzers run out of popcorn.
July 1
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Barry, what about

4.5) have two completed but not identical cards
July 1
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There are enough playable first moves for White, that even a weak player might well happen to select one of them.

I find that a more reliable way is to watch someone conduct the middlegame, which presents less opportunity for a player to imitate published play.
July 1
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When I started to read the title, I thought this might be about forcing pass systems.
June 29
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The diagram is missing East's third-round pass.
June 28
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Dale has stated directly what I was subtly hinting obliquely.
June 28
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I believe it's Board 29.
June 27
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LAW 40 (excerpt)
PARTNERSHIP UNDERSTANDINGS

A. Players’ Systemic Agreements
1.(a) Partnership understandings as to the methods adopted by a partnership may be reached explicitly in discussion or implicitly through mutual experience or awareness of the players.
(b) Each partnership has a duty to make its partnership understandings available to its opponents. The Regulating Authority specifies the manner in which this is done. (Bold added.)

I read the last sentence as, “The Regulating Authority is supposed to specify the manner in which this is done.”

It seems to me that the Regulatory Authority's failure to issue regulations that enable making “partnership understandings available” does not relieve a partnership of its duty to do so, and alerting the applicable call seems appropriate.
June 27
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Did you mean 56QA A6 79KA T54?
June 27
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I believe there could be communications or timing issues. I'll give North Axxx Axxx xxx xx. South takes the third round of clubs and exits with a heart to Dummy's jack (ducked by North). Dummy cashes one diamond (cashing a second diamond fails if South started with J-fifth and at least one ace) and leads a spade to South's queen. South returns another heart (ducked to Declarer). Now the defenders are ready to defeat the contract with two spades, two hearts, and a club, and Declarer has only two hearts, two diamonds, and four clubs.

One merit of leading the J at Trick 2 is that if the queen is taken immediately, the remaining clubs provide entries to both hands. If a defender exits with a club, that gives Declarer an additional tempo.
June 26
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That could well be. I phrased it that way to elicit any applicable agreements (“With a weak suit, we prefer to have an opening hand” or whatever).
June 26
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