OVER AN
INTERVENING
TAKEOUT DOUBLE
SSS by Danny Kleinman

SAYC. A suit-response is forcing and unlimited at the 1-level, non-forcing (6-10 points, usually a 6-card suit) at the 2-level. 2NT shows a limit raise or better. Redouble shows at least 10 points, but is a last resort for hands that qualify for neither 2NT nor one in a suit bid. Jump raises are weak. Jump shifts are "to play," like weak 2-bids or opening 3-bids [but these opening bids are not "to play" facing better than minimum opening-strength hands, so the SAYC description of the corresponding jump shifts just can't be right---DK].

SSS. A suit-response at either the 1-level or 2-level shows a good suit (the doubler has advertised length in that suit) but is not forcing.  Jump raises are distributional and preemptive, with 2NT showing a limit raise or better. Redouble shows at least 10 HCP, urges opener to double the runout with good trumps, and creates a one-round force if responder
bids a new suit next. A jump shift is constructive but non-forcing, showing a good 6-card suit with slightly less than game values (about 9-11 HCP).