To calculate values of a player's option, temporarily prune the tree by removing the currently not considered alternative option. This leaves two options for the opponent's start.
Your tree has options for both starting players and this makes it more complicated than any of my theory uses explicitly. Nevertheless, your questions are valid for a possibly broader understanding.
With two options for the opponent's start remaining in the pruned tree, CGT techniques must be considered. In particular, we try to detect if any of the opponent's options is dominated or reversible so can also be pruned.
If thereby the tree is without alternative options, calculate the tentative gote move value, Black's tentative sente move value (for the left sente sequence) and White's tentative sente move value (for the right sente sequence) like we always calculate gote or sente move values, respectively.
If, however, two options of the opponent remain and other reasoning cannot choose clearly, then tentative move values are undefined (so far).
If all tentative move values, tentative counts and Black's and White's follow-up move values could be calculated for a particular option, we derive the assessments of the type of the initial position for that option.
"Definitions 17 [types]
For such a local endgame, we define these types:
local gote :<=> MGOTE < MB,SENTE, MW,SENTE,
Black's local sente :<=> MW,SENTE ≥ MGOTE > MB,SENTE,
White's local sente :<=> MB,SENTE ≥ MGOTE > MW,SENTE,
Black's ambiguous :<=> MW,SENTE > MGOTE = MB,SENTE,
White's ambiguous :<=> MB,SENTE > MGOTE = MW,SENTE,
doubly ambiguous :<=> MGOTE = MB,SENTE = MW,SENTE." [22]
Again, I do
NOT define the types of individual moves. I define the types of positions.
https://www.lifein19x19.com/viewtopic.p ... 45#p143245
you play 
in the environment. That means this sequence