How are brilliant moves decided?

My opponent just did a brilliant move and I have no idea why

https://www.chess.com/analysis/game/live/6421566458?tab=report

Not sure about how the algorithm decides what makes a move 'brilliant,' but assuming your opponent expected your eventual move to c2, Kh2 would have prevented a fork (Ne2) should they have countered your move with Rc1?

ik ik ik not the best game ive played XD

Brilliant moves are moves the engine didn’t really detect. The engine calculates to a certain depth after that it does not calculate any further moves, higher depth the longer it takes to calculate of course. If a human plays a move, it forces the engine to reset it’s depth and calculate all new possible moves starting from the new position. The computer might suddenly see that the move played was better than the suggested best move, hence brilliant moves can’t be suggested by the engine and only humans can play them. Even if the move seems “obvious” to us, the engine might have spotted another move that it thought was the best, until of course it is forced to recalculate. I hope this could help!

Well its the only move that doesn't lose for one saving the game as all their other opinions would have lost

True, but like I said because of the engine depth limitations it couldn’t calculate far enough ahead to see that it was the best move. You can change the depth yourself in your analysis setting but like I also mentioned it will take longer to calculate the moves.

its basically about computer analysis depth, if the engine didn't bother to calculate the line and it happens to be better than anything it did calculate, you got yourself a brilliant move,

whats nice about it is that from now on in this position it wont be a brilliant move anymore.. just the best.

got one today for the most obvious move for a human to make.

the Greek gift sacrifice i was pushing for the entire game just waiting for my opponent to castle

so basicly

they are good moves

All bonkers . The tool is off it’s rocker, bugged by inconsistency’s and clueless evaluation. Accuracy scores are a standing joke, the shallow search only revels the obvious blunder. 

It’s because every other moves either loses and not so obvious 

• Brilliant moves are the result of bot's stupidity.

well said

lol

The difference between a best move and a brilliant move is that a brilliant move is the ONLY move that is winning and all other moves are either draws and/or losing moves. If you are in the position to make a brilliant move, you have no good moves, no excellent moves, and only 1 best move, which is considered a brilliant move. There are 2 types of brilliant moves, if you download the game PGN you will notice a brilliant move with either 1 exclamation mark or 2 exclamation marks. When the computer engine analyzes in a much deeper depth, the 2 exclamation mark !! brilliant moves are very rare and MUCH harder to find than the single exclamation mark.

You could also just increase the depth like I said, it will have a better evaluation but it takes longer and people really don't like "wasting their time"!

That's simple not true, it depends on the engine's depth, if you set the depth higher, the engine will suggest the move and it won't be indicated as brilliant.

 

https://www.youtube.com/watch?v=nnx5cfFQ3jw

 

I see what you’re saying but like I said, it still only depends on the engine depth. Even if it is at max depth it might not be able to calculate enough moves for it to know that it is “brilliant”. By playing the move and you force the engine to calculate all following moves starting from that position (resettling the engine’s depth), if the engine sees that this move is better than the best move it was able to find, it’s a “brilliant” move. You can also just download the stockfish engine for yourself, set the depth to like 60, give it a couple hours of time and it will suggest totally different moves than the engine at depth 30. Of course it will take way longer to calculate and analyze the game and it won’t give you this handy game report card but that’s just because of chess.com limitations. Takes more processing power etc. So I would suggest you check out the stockfish engine for yourself if you’re interested, the link is: https://stockfishchess.org or https://github.com/official-stockfish/Stockfish for the source code.

 

Exactly! People don't realize that even though you are in a scenario when there are 1 best move, there are also alternative moves like excellent moves and good moves, which are all WINNING moves. However, in a scenario where all the alternative moves are LOSING moves because all other moves are inaccuracies, mistakes, or blunders, the best move NOW becomes a brilliant move. For example, if you had 1 best move out of 82,179, 345, 864 possible different moves, and the other 82, 179, 345, 863 are all losing moves, than that best move NOW becomes a brilliant move.

 

To put it simply, a brilliant move is the complete OPPOSITE of a missed win.