mink, on 2013-April-08, 16:05, said:
We haven't been told the exact plays in the diamond suit, but it seems likely that at the time of West's pause there was still an entry to dummy. If so, West would have to keep ♥J in order to protect his partner's putative 10 from a finesse.
The idea that East needs to be told to keep a heart guard seems doubtful: what else might he be considering keeping?
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This might depend on the level of the player. Lamford's description of "a player who had won the event on more than one occasion" encompasses quite a wide range of abilities, but it seems unlikely that a player who could quickly work out to bare ♥J would then need a minute to decide whether to throw it away.