Solution: Deck deception - NYT Crossword

Both of these clues refer to playing cards, and both solve to debut puzzle entries. 24A, [Ambitious tactic in bridge], is a SLAM BID, which can be “small” or “grand” and requires fearless players who are (ideally) in sync. I hadn’t seen this term before and had enough letters to wrongly deduce some kind of “gambit” here, maybe with a directional (South gambit? Sounds plausible). At 27A, [Deck deception] had me wondering about subterfuge at sea, but the deck here can be shuffled and dealt. This answer, FALSE CUT, is sleight of hand used in executing a card trick that preserves or manipulates the order of cards in a deck, while it is apparently being split at random.