DavidKok, on 2020-July-11, 00:58, said:
Which card to lead depends on partnership agreements, but for me the choice would also be between the queen of spades and the three of hearts.
That being said, this is a tough decision. On the bidding West likely has 3 or fewer spades, and East will not have five of them. The suit is likely to break 4-4-3-2 or 4-3-3-3, which means if partner gets the lead once or twice you could pick up four tricks there even opposite just xx(x). Leading them might well hand declarer a spade trick they don't deserve. But leading a heart is similarly risky - partner needs quite some values before we can promote a heart, especially since you want partner to focus on spades. Leading a heart only seems winning if partner has something like KJxx or KTxxx.
At the table I would lead the queen of spades, and pray for either West or South to have the king of spades so I did not blow a trick. The singleton diamond is concerning, and I want an aggressive lead.
The only addition I can make to this thorough reply from David is that when leading the
♠Q from an internal sequence like this, declarer will possibly not have any indication who has the ace. Declarer with
♠Kxx may well duck the first trick hoping to sever communications. On this lead, however, any self-respecting South who's holding the ace should cover and return the suit but not all players would do that, especially with a doubleton Ax covering an honour with an honour. If West decides to duck for any reason, this may well provide you with a tempo and information what to do next.
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I rank
1. ♠Q Probably gives declarer a trick but might set up 3 tricks for the defence.
2. ♥3 Just as dangerous but (IMO) less hopeful.
3. ♣2 More passive but might be declarer's suit. Likely GIB choice.
4. ♦2 But you probably can't get a ruff