Free, on May 15 2008, 02:39 PM, said:
If you lead a ♠, I think the 8 is clear cut! Partner will have 5 ♠s so he needs to know in which suit he can reach you. ♠T asks ♥ and small ♠ asks ♣. When declarer shows out in the first trick, I think partner will know what the 8 means.
If your objective is to cater for Kxxxx and AQJ9x, it's at least as effective to lead the 10, which will hold the trick, followed by the eight, which is suit preference.
There is a potential, though unlikely, problem with leading the eight: partner will think you have 8x, and will win the jack from AQJ92. Then you can't cash three more of the suit whilst still retaining a tenace over dummy.
Edit: Sorry, I got my suits mixed up. Once
♠10 holds, the choice will probably be between the red suits, so I expect I'll be leading a low one on the second round. And, I think I was too dismissive of Free's suggestion - it is possible to imagine a layout where the choice is between three suits rather than two.