Invisible to Engines | One Of The Greatest Moves Ever Played

The dog is trying to improve his position

I’m watching this two years later on a Sunday and it was in this position my Sunday was improved.

cheaters: use engine to gain advantage Leko: "That's a blunder."

“White’s pawn structure is awesome. Black’s pawn structure is... you know... rather sad.” 5:30

The dog backstroke swimming is the best part.

In case anyone is wondering how an engine can miss a move like this but see how powerful it is afterwards, I'm something of an expert in chess engines. It's due to something called pruning, which is difficult to describe succinctly, but I'll try. (Edit: due to a lot of feedback I'm editing this slightly to remove some terminology that is triggering to people who are rightly pointing out that there's a technical error in this analysis. I don't think it's a very consequential error, but I want to head-off further objections that are technically correct, but IMO miss the point.) A chess engine searches for moves using something called a move tree. Basically if you pick a move, then try all the moves that result, then try all the moves that result from those moves, etc, you end up with something that looks like a tree, this is called the search tree. With each move that is tried, the search tree grows exponentially. This means no matter how fast the computer, as the search tree gets large, it becomes impossible to check every move. So to search to a greater depth (deeper into the tree) it is necessary to "prune" the tree, meaning we cut off branches that are "obviously" bad, and don't search them at all! How can a move be so obviously bad that we decide to ignore its entire branch in the tree? This is where pruning comes in. Let's say it's blacks turn, and we check a branch and it leads to a plus 3 evaluation for white (i.e. white would get a piece up). If we already found a branch that leads to an even score for black, we cut off the branch a soon as we find the moves that lead to plus three for white, and we no longer have to check anything in that branch. This technique would be fine in theory if it weren't for the fact that engines have a dirty little secret. Engines ABSOLUTELY SUCK at evaluating a board position. If this is true how can they beat the best player in the world? The answer is by looking so far ahead that the crappy board evaluation routine becomes less relevant. If we find a branch that leads to utter domination 20 moves later, it doesn't really matter that our evaluation is off by a point or two. In practice this means engines can miss great moves for a variety of reasons, but it almost certainly comes down to a bad pruning at some point, leading to the engine not even checking the move or even the branch the move is on. As I said this is difficult to explain for non programmers but hopefully this gives you the big idea. Feel free to ask questions for anything that was unclear! I love this stuff and I'd be happy to explain further.

A beautiful dog that will be remembered in the history of chess

It's not about finding the move. It's about understanding why that move is so good, the reason behind it, the whole concept. Leko knew and I believe the moves after that felt natural to him.

6:53 and in this position the dog fell off the couch. Why did he fall? Well theres no moves to be made, hes out of space on the couch and he falls.

Engines: 🤖 ... a disgusting H U M A N line

2 years later here, but Stockfish 12 sees the move Queen to D3 correctly.

Three years later it did improve my Sunday.

One and a half year later, it's now 2020 and Stockfish 10 found this move immediately. The machines are evolving fast.

Agadmator : this is the most legendary move in the history of legendary moves . If you find it you are legendary. Comments: wowow the dog in the background

I recently re-took up chess. As I stopped playing a while ago, I never really watched on line chess or checked out videos. So as I have come home, I have to say they are great. The commentator makes it. He great!!! Chess is great! But like anything else it's nothing without people. And this guy is great at it! Good content, witty yet brief comments. And he's not full of himself! Keep up the great work!

This wonderful channel has rekindled my love for the game of Chess, Well done, and always interesting.

Engines HATE this move

The dog is having the time of his life in the background

I like this dude's narration of these games.

"A beautiful game that will be remembered in the history of chess." *Everyone only focused on the dog.