Why Is This Move Brilliant?

Move 13

Huh, even the game reviews 'show moves' doesn't provide a clear explanation

I mean black does come out with a great position afterwards

Ok Thanks

Something weird going on here, the PGN´s full of stuff like this:

39. Rxc8 Kxc8 $14) 35... Kd6 36. Rd8+ ({+0.13} 36. c7 f5+ 37. Ke3 Kxc7 38. Rg8 g5
39. Rh8 Kd7 40. Rxh6 Ke7 $12) ({0.00} 36. f4 f5+ 37. Ke3 Kxc6 38. Rc8+ Kd7 39. Rg8
g5 40. Rg7+ Ke8 $12) (my colours). Needless to say, the analysis board won´z accept it.

Can´t see anything brilliant about the move either.

To be brilliant a move has to sacrifice material or allow material to be taken and be best or good.

Technically, the move allows the knight to be taken, even though it can't be saved. I believe moves like that are going to be excluded from the brilliant definition bin an upcoming update.

I just ran a review on the game and the move is just best, not brilliant

Maybe it changes based on the rating of the person who’s analyzing it..?

It is influenced by rating but I don't think it used the analyzer's rating if they didn't play the game.

What review strength are you using?

It isn't brilliant but they count it as brilliant. However, black is a rook up and will be an exchange up. Therefore black isn't sacrificing in any real way. It does give black a lot of good activity but the game's probably won anyway. So in the real world it isn't brilliant. I certainly think that d5 is black's best move however. Puts white under a lot of pressure due to the pinned pieces and should win a won game. ...d5 should be an obvious move. Basically the Q on d2 is unsupported so white's d3 pawn is pinned and Ba3 seems misplaced because white has self-inflicted another pin. Black has the more active position.

I’m using standard.

That could be part of it. I ran it as Maximum.

Ok thank you so much