Advantages
XY Notrump gives very good control finding both games and slams, as the final "mission" of the sequence is established at a relatively early stage of bidding.
Playing, as very common in combination with XY no trump, the Walsh convention or even Transfer Walsh, one still has the chance of stopping in 2♦ on weak hands, often impossible using for example Checkback Stayman.
Read more about this topic: XY Notrump Convention
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