One of the more "questionable" ideas that I had in Cuebidding at Bridge was this auction example:
2D-P-3S = stiff spade, diamond support
I still like it, but Eichenbaum has convinced me of a perhaps better treatment, one that we now use.
I have always played that a jump here is a splinter for Opener's SECOND suit. hence:
2D-P-3H = stiff heart, support for diamonds
The theory was that I can support spades with a 2S call and THEN splinter.
So, the logical idea is that 3S IMMEDIATELY handles all splinters with spade support!
2D-P-3S = stiff somewhere (not clubs, obviously) with SPADE support
Now, after the suggestion, it seems obvious.
The beauty of this is that the "spade splinter" stiff exists:
2D-P-4C = diamond support, SPADE shortness!
That's easier to remember.
You may of course then say, well what about the Picture Jump in clubs? Well, because you erased all of the splinters from the 2S call, voila!