Game Review - What exactly is the search depth?

The (Standard) Game Review strength is advertised as having a 3430 rating. Based on page 77 of this paper (http://web.ist.utl.pt/diogo.ferreira/papers/ferreira13impact.pdf), that rating probably translates to a search depth somewhere around 20-30.

However, the evaluation is still inconsistent when compared to the analysis engine. Below is an example from a game I played where the Game Review evaluation is completely off when compared to the analysis engine with a depth of 14, 18 and 28.

Can anyone explain what causes this?

https://www.chess.com/analysis/game/computer/75526783?tab=review

Game Review doesn't use Depth anymore, using a node base process instead. That said, in your examples, those evaluations are very close together. In situations where multiple moves are closely evaluated, any given run could place different moves as best.

Engines won't always provide the same moves at the same depth even, especially in such instances.

Interesting. Could you elaborate on what you mean by node base process? I'm familiar with most search algorithms but not with this.

As for my example: I wasn't trying to point out that 'Game Review got the best move wrong', I was wondering how there can be such a gap in the evaluation between Game Review (-3.40) and the engines (roughly -2.10).

I appreciate the reply.