Cyberyeti, on 2023-May-02, 02:25, said:
We play it as showing spades but in the context of it showing an extra king with this shape as we'd have opened this hand 1N.
Also is partner with 4 spades bidding 4♠ over a 4♥ raise ?
Partner may well feel reluctant to bid 4S over 4H with Kxxx at best, but he has forced to game opposite what may be and is an indifferent 12 count, so he has a good hand. If the opps, at equal, bid 4H, the chances are that, if he has spades, he is something like 4=1=3=5/4=1=2=6 with an opening hand.
Iow, he’s not passing 4H. He is doubling and now we bid 4S, having limited our hand. He can pull with a good hand without spades, say 3=1=3=6. In contrast, had we bid 2S, he’s under enormous pressure after a 4H bump, since we could easily have a much better hand, such that he pretty much has to at least try for slam….at which point our actual hand is likely to disappoint.
As for using double to show spades, that makes a bit more sense in a weak notrump method if the double shows a strong notrump with spades or a good opener with say 4=1=5=3, but I still prefer that double show a willingness to defend.
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