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Strong Notrump After Passing is a bridge bidding convention originated by Jeremy Flint and Tony Priday and is a one notrump bid by a passed hand in response to a one-level opening by his partner.
Similar to the Drury convention, SNAP is intended to keep the contract at a low level when it is possible that partner has opened with a light or minimum hand in third or fourth seat. While a 1NT response would typically show 6-9 high card points in most Standard American partnership agreements, the SNAP 1NT response instead shows a relatively balanced hand with 9-12 HCP and no five-card major that could have been bid at the one-level.
When using SNAP, a 2NT response shows a balanced limit jump raise in opener's suit.