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Criss Cross Raise - Also known as the Criss Cross Jump Shift or Crossover, a convention to address minor suit openings when responder has a invitation values (some play game forcing) and no 4 card major.
Feb 26, 2020 · criss-cross inverted raises is designed to distinguish game forcing raises of minor suits from raises that are only invitational. (The double raise is still weak and preemptive in either case, but according to Bridge World Standard 2017, shows "some values", i.e. enough to have a shot at 3NT if partner has 18-19 balanced.)
Nov 24, 2017 · When not vulnerable, sometimes when responder has a singleton or void (unsuitable to respond 1NT) and good trump support, he may have to decide whether to make a slight overbid with an invitational raise (Criss-Cross) or a slight underbid with a preemptive jump raise.
Alternately, mikeh's scheme using criss cross allows you to retain the simple single raise as normal which can be useful in fighting for part scores, or making sure (esp important at IMP) that you play and make 2 or 3 m rather than being off 1 in 1NT.
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Using criss cross, the bids of 2♦*after 1♣, and 3♣* after 1♦, Jump Shifts (J/S) in the other minor (an alert – in Red on the Convention Card), show a limit raise (10-12 HCP) and at least 4-card support for the bid minor, and denies a 4-card major. These bids are invitational to game.
