B(♯4) 7-string bass chord

How to play B(♯4) on 7-string bass

The most common way, the first shape above: your index finger on the E string at the 1st fret, your ring finger on the A string at the 2nd fret and your middle finger on the D string at the 1st fret. Let the B string ring open. Don’t play the G, C and F strings.

From the B string 0 1 2 1 x x x (x: not played, 0: open)

What notes are in B(♯4)?

B(♯4), B major with sharp four, no fifth, is B, D♯ and E♯: the root (B), the major third (D♯) and the augmented fourth (E♯). Its formula is 1 3 ♯4.