Lesson 9
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Explain that the lead in a suit is different because you are threatened by declarer's trumps which can rapidly trump your master cards; one favours two types of lead:

a) the top card of short sequences: the problem is not the same as in No-Trumps: i.e. establishing a long suit; you simply want to make your master tricks (31)
b) lead a singleton if you have trumps to trump in with: trumping in is not the sole right of the declarer 23.