Double Bass Simandl method and key of B

[Brunot]

Iam studying with classic Czech and German methods and they have the same system. Fingerboard begins with half position(or also called the usual position) which contains the first 3 half steps. So:
Half pos.
E-F,F#,G
A-Bb,B,C
D-D#,E,F
G- G#,A,Bb
Then it continues with the first position, so it can be confusing because the first pos. is going after the half position which IS first when talking consecutively. In the first position, the C# note can be voiced easily on the A string as it goes : B,C,C#.
So: Half position, then first position.

 

[Beginner Bass]

So do I move my thumb from half position to first or is does it use the same anchor?

I was taught that when shifting, your thumb should always be behind your 2nd finger. Of course pivots and stretches are one thing, but when shifting, your hand shape should stay fairly uniform.

 

[what the pluck]

. In the first position, the C# note can be voiced easily on the A string as it goes : F#,G,C#.

So: Half position, then first position.

Don't you mean B C C#

Edit : or G# in B Maj which I think the op is talkin about.

 

[Brunot]

Thanks for pointing out, havent noticed that I actually mixed it up with E string.