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31 votes
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Why does chess.com consider this promotion a blunder?

50 points sounds huge, but there actually is no meaningful difference between -6.4 and -62 in such an endgame.* 6.4 is more or less "Black has a queen for a bishop (but I haven't found a way to ...
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28 votes
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Stockfish blunders away a piece

This is not a blunder, expected behaviour from the engine. Everything worked as intended. Try to copy the FEN string out, and you'll know. Although the position looked winning, White didn't have ...
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  • 21.4k
24 votes
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Is this really played by 2200+ players?

In short, after some investigation, I do not believe that white was a 2200 player is the real answer. First, I found it odd that it says he was exactly 2200. This is the only tournament I can find ...
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24 votes
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Why is g3 a bad move here?

Pawn structure. Allowing the exchange ...Nxf4 gxf4 simply weakens your structure considerably. The pawns on f2, f4 and h2 are disjointed and cannot protect each other anymore. Black can immediately ...
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  • 5,774
23 votes

Why does chess.com consider this promotion a blunder?

This sounds like a bug. Using Lichess's analysis engine, it takes Stockfish 14 less than ten seconds to find a mate in 11 moves. Both 1...Kg3 and 1...g1=Q lead to mate in 11. So there should be no ...
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21 votes
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Improving the observation skill & making less blunders

I will go back to what Artur Yusupov, three-time World Championship Candidate, former top-10 player, and one of the greatest living trainers recommends in the first book of his 10-volume series. In ...
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21 votes
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Has there been any blunders in resignation?

The official source that people link to when this question comes up is Tim Krabbe's excellent blog post from more than 20 years ago now: The ultimate blunder. He collected every single game in the ...
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  • 14.9k
17 votes

Is this really played by 2200+ players?

White (Rigaud) did not have a Fide rating. Until 1981, the Fide rating floor was 2200, which means that any rated player had at least 2205 and that non-rated players taking part in a Fide-rated ...
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  • 12.9k
17 votes

Why is Qf5-c2+ a blunder?

The engine considers Qc2+ a blunder because it's a draw by repetition. (I think the position is probably a draw anyway, but Black could at least try for a win.) The problem is that you have already ...
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  • 1,243
16 votes

Why was move 26 in Carlsen-Anand 2014 WC Game 6 a blunder by both players?

Carlsen's 26.Kd2 is a a blunder because it exposes the White King to a tactic that wins two pawns and gives Black terrific pressure. The tactic is effectively a guarantee of victory for Black: [FEN "...
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  • 2,113
15 votes

Opening positions where declining a gambit is a blunder

Sure, for example the Halloween Gambit. This is not a sound gambit at top levels of play, but if White plays it, Black must accept. The alternatives are even worse. [FEN ""] 1. e4 e5 2. Nf3 ...
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14 votes
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How to fix 1 turn tactical errors

It is a common problem to calculate all the variations and then suddenly realize that the first move was simply terrible. Actually, there is a rule that should be applied after finishing a complicated ...
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  • 6,570
13 votes
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Probability of making a game-losing move as a function of Elo?

Coincidentally I already answered exactly this question in response to a similar question. Edit: This similar question was about frequencies of blunders in games, which made the analysis somewhat ...
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13 votes

Why is g3 a bad move here?

Other answers have made many good points. But the main reason g3 is a bad move can be reduced to a very simple explanation: The knight on h5 is a very bad piece, it has almost no squares to go to and ...
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13 votes

Why did Lichess annotate this as a blunder?

Its evaluation drops form +2.3 to +0.0, so it considers it a blunder. Of course this does not match what a human understands as "blunder", but computers are incapable of identifying that. ...
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  • 13.1k
12 votes

What are good ways to check blunders after the match?

Lichess.org has a free browser-based game analysis tool that allows you to copy and paste your PGN file for online analysis. It's powered by Stockfish, and the analysis automatically: Annotates the ...
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12 votes
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Is there a name for this common type of blunder?

It is probably a bit more general than what you describe, but one move blunders are often called (a case of) "chess blindness". I'm not a hundred percent sure, what exactly happened in you're case ...
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12 votes
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What is the difference between an inaccuracy, a mistake and a blunder on lichess?

Blunder: 300 centipawns Mistake: 100 centipawns Inaccuracy: 50 centipawns This is sourced from http://en.lichess.org/qa/75/how-are-these-determined-blunder-mistake-and-inaccuracy It is the first ...
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12 votes

What are the worst blunders ever committed in a world championship match (final)?

By far, the biggest blunder in all world championship is absolutely 32.Bb4?? played by Chigorin in the 1892 match. He threw away the win and the match, landed himself to mate in 2. https://en....
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11 votes
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Can computer analysis really understand human behavior?

This response will be very critical of OP's attitude to chess analysis, and I realize that it may even come across as somewhat harsh. However, it is assumed below that OP is interested in improving, ...
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  • 7,332
11 votes

I am trying to understand chess moves

14.Nxd4 takes a pawn on d4, and it attacks the bishop on h5. So if black takes back with 14...cxd4, then white has 15.Bxh5, leaving white a pawn up (knights and bishops have roughly the same value). ...
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10 votes

Improving the observation skill & making less blunders

One of the most important things we tell players who are a bit above beginner level is to have a checklist they go through before making each move. It looks like this: checks captures threats ...
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  • 75.7k
10 votes

Opening positions where declining a gambit is a blunder

Some gambits whose best response is to accept. 1 e4 c5 2 d4 cxd4 4 c3: Sicilian Defence, Smith-Morra Gambit 1 d4 Nf6 2 c4 e5 3 dxe5 Ng4 4 Bf4 Nc6 5 Nf3 Bb4+ 6 Nbd2 Qe7: Budapest Gambit 1 e4 e5 2 Nf3 ...
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  • 5,570
9 votes
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What percent of chess games contain a blunder?

I happen to have a dataset with 25000 games with stockfish evaluations after every move. I just did a little blunder search and these are my findings: Blunders from an equal position (-1.00 < ...
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9 votes

What is the worst possible first move for White: 1.f3 or 1.g4?

What is the worst possible first move for White: 1.f3 or 1.g4? f3 doesn't contribute to the piece development ( it actually hinders it by taking away the best square for the Ng1 ), it doesn't fight ...
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9 votes

What is the most effective way of reducing blunders?

Chuzhakin's System is written in 70 PDF pages. video:Chuzhakin's System intro It has 18 Rules to find so called "Hazardous Elements" - HE. Before making the move which we selected we need to check ...
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9 votes
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Has a "resignation blunder" ever been refused?

Some quick Googling suggests that the rules (or at least some sets of rules) do allow you to refuse a resignation from your opponent This does not reflect the FIDE Laws of Chess. According to Article ...
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  • 75.7k
8 votes

What is a blunder?

The first English definition of blunder I see is "a stupid or careless mistake", and that's how I have always perceived the term in chess. It's not the severity of the error that matters so much as ...
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  • 14.5k
8 votes
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Having knightmares, what to do?

The solution is: play better chess. Train your tactical skills so you can better anticipate the opponent's knight's threats (and also make a better use of your own knights). Avoid creating weak ...
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  • 13.1k
8 votes
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Why did Lichess annotate this as a blunder?

The "blunder" annotation is derived from server-side analysis using a low engine depth, which is usually inaccurate.
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