Thanks Mike. can't claim any originality to them chords.
I got the first one from gery Silverman and Skip James. Skip calls it a c7+7. Or is that a c7-7? I forget. I found the other one by sliding the shape up and down the fret board.
Skip also calles it the lifeblood of blues and I find it a great bridge twix B7 and E. Use it in E minor too.
Use it a lot as my fence post fingers and work dammaged hands don't contribute to barre chords, but i can hold a B7th shape, and use the fore finger on the two top stings to give me the slash bass thing. fat fingers also foul the B string enough that it doesn't clunk in the posisions it doesn't work. Well good enough for my purposes anyway.
When i was using the G-VOX guitar midi bridge, i used to edit them either out or slide them to a compatable note.
Thank Mike. I asked because no musoes I know have ever used them until they saw me using them and liked them.
Regards.
Graham

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