The Top-and-Bottom System
Of Two-Suited Overcalls/Cue-bids
~Play the Unusual NT for the two LOWEST un-bid suits.
~~1C-(2NT) shows diamonds and hearts
~~1D-(2NT) shows clubs and hearts
~~1H-(2NT) shows clubs and diamonds
~~1S-(2NT) shows clubs and diamonds
~Top and Bottom
~~1C-(2C) shows diamonds and spades
~~1D-(2D) shows clubs and spades
~~1H-(2H) shows clubs and spades
~~1S-(2S) shows clubs and hearts
~A jump to 3C shows the two HIGHEST un-bid suits
~~1C-(3C) shows hearts and spades
~~1D-(3C) shows hearts and spades
~~1H-(3C) shows diamonds and spades
~~1S-(3C) shows diamonds and hearts
~~Holding diamonds and hearts, bid 2NT
~~Holding diamonds and spades, bid 2C
~~Holding hearts and spades, bid 3C
This system works for all two-suited hands and ALWAYS shows the two suits held by the overcaller/cue-bidder. Knowing which two suits partner holds will sometimes lead to a great contract or sacrifice.
All you lose in playing this system is the WJS or SJS to 3C. What you gain is far more useful.