In a disturbed auction, a jump shift below game opposite a suit-showing bid is a forcing fit jump. This sets partner's suit, making it a fit auction, and announces a potential source of tricks in the bid suit – typically five cards including at least the ace or king – which would benefit from an honour holding in partner's hand. The bid is based on playing strength and may be semi-pre-emptive.

WestNorthEastSouth
733dbl
Q54
AQ872
A1063
A fit jump agreeing clubs.
WestNorthEastSouth
KJ952pass12
AK923
87
Q6
West has values for 4 and a slam could easily be on if partner has the right cards. The fit jump identifies the prime assets in West's hand – heart support and a potential source of tricks in spades.
WestNorthEastSouth
23
4
A game bid, so to play. North will have to risk the five level if he wants to continue partner's pre-empt.

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