what makes a move brilliant?

@tpr those criteria of yours are highly disputable

• such moves ºcanº be brilliant, but those criteria aren't necessarily required (not ºsine wua nonº) for a 'brilliant' move

@all ' brilliant winning move in a lost position ' -
I also vote for reading this as 'seemingly lost' . . . of course during a game - in situations where brilliant moves happen - no one has certainty about the evaluation

#20
12 Bxh7+ is no brilliant move as it is no quiet move: it is both a check and a capture.
The Greek Gift sacrifice is well known and taught to beginners early on.
https://lichess.org/practice/advanced-tactics/greek-gift/s5pLU7Of
Weaker players recognize the pattern in blitz games.

I guess, back in 1930, tpr was not old enough to be taken as the authority on the subject.

It's the . . . that makes things brilliant. It's a fishing lure ...
Sarcasm: My opponent did a brilliant move. Now I can win. What a brilliant mistake!
Brilliant is the inverse of sarcasm.

A brilliant move is not an obvious one, but it can be too. If a move has a significantly low engine cp evaluation at shallow depths but has gained cp value at high depths, than it should be considered a brilliant move. A good move once played has no lasting effects. For example it was a logical exchange but does not change the result of the game. While a brilliant move increases in value because that was the game changer.

@Toscani said in #25:

A brilliant move is not an obvious one, but it can be too. If a move has a significantly low engine cp evaluation at shallow depths but has gained cp value at high depths, than it should be considered a brilliant move.

What is brilliant about a move that is obvious? Any example?

. While a brilliant move increases in value because that was the game changer.

You mean the evaluation of the position is better after the move than before? Sorry, this is not possible.

Website program code. All these classifications of moves in game analysis are kindergarten.

Look at the debug of an analysis and you will see the cp values change. Try go depth command in the terminal.
Just leave lichess analysis run in infinite and if you are lucky you will see the cp values change with depth. you might even see PV1 becoming PV2 and then returning to PV1.

You don't have to be lucky to see the top moves change position. Happens all the time. If they didn't, there would be no point in searching at greater depths, ever.

Post #26 and #29 don't seem to agree. What are the comments trying to do or say?