User:FingLongah/Coded 9&10

Coded 9&10
Coded 9&10 leads are meant to help reduce the ambiguity of standard leading conventions.

Leading the 10 from holdings AJ10 and KJ10 instead of the jack (which can also be lead from J109 and J108 combinations) making it difficult or impossible for their partner to tell whether partner or declarer is holding the Ace or King. With A109, K109 and Q109 combinations you would lead the 9 now instead of the 10.

Using this leading convention, the lead of a 9 or 10 either promises 2 higher honours (the next highest card and another honour not directly above that) or that the 9 or 10 is the highest card in the suit.