Exact, Exacting: Who is the Most Accurate World Champion?

Accuracy won't matter if you can't win. At least with white players should try out some less popular lines and play a real game of chess and 1 win for either player will make the matches more dramatic.
That's all I wanted to say! But lichess is doing a great job!

This should be extended by Paul Morphy

@Lichess @cynosure The game score for game 9 of the 1957 WCC is wrong. Botvinnik played 32. Qxa7+ (which is probably the best move) and went on to draw. Does anybody really think the game went 32. Qxd6 Kh8?? 33. Qd7 Rc3? 34. Qd8??, and that Botvinnik just missed a whole rook and went on to draw? You actually have the correct game on your site here: lichess.org/5ZSgTKU1#56 (Imported by MoveEleven).

I don't know how many game scores are wrong in your studies but you should probably check your sources for the games.

What is weird is that your box and whisker plot does not contain the combined ACPL value 154.90 that you assign to the game in your chart above (titled "The top 5 most accurate and bottom 5 least accurate..."). In fact the maximum Comb. ACPL in your plot is under 100 for the 1957 WCC. Of course I am not sure I am reading it correctly but I always thought the whiskers corresponded to the min and max value of the y-axis. If that is wrong let me know.

Were the chart and plot made seperately? Are the studies you created reliable or do they contain more wrong game scores? Did you not use the studies to mine data and if so, what game scores did you use?

Cheers to the Obama meme

Imagine thinking computers can play chess, or that a completely arbitrary output of an evaluation function means "accuracy".

If we're coming up with our own definitions of words, I'm World Champion. Where's my prize?

Magnus?

Some of the game PGNs are incorrect, for example see Botvinnik - Smyslov 1957 game 9: Lichess lichess.org/study/MPkpQJkr/0XiCd2ia and chessgames www.chessgames.com/perl/chessgame?gid=1032431

It warms my heart to see data being used for the common good rather than for profit.

@Munich said in #25:
> I would like to know who is the most accurate Player? This I would find more interesting than to know what was the most accurate game (which is likely a draw).
> I think by measuring the average accuracy, it should be possible to plot a graph where you can read off the elo strength of each player. For instance, I expect a GM to play more accurate on average than an average club player. There is certainly a strong correlation with strength and accuracy, but it would be interesting to know how reliably strong the correlation is.
>
> The average mistake a player does is certainly also dependent on style. Wild positions will deviate more, short dull games, rich of exchanges and a quick draw will not have many blunders in them, mainly because alternative moves are often almost equally good. But in wild positions the difference in the evaluation of possible candidate moves can deviate quite a lot.
> For example: the second best moves in wild positions can be much weaker than in dull positions.

Indeed it would be interesting to see how much ACPL correlates to player strength. I remember there used to be an online database of games and players located at chess-db.com that had a similar feature on the players profile.
But I suspect that the correlation would not be very strong. I bet there are a lot of FIDE masters that are much more "accurate" players than, say, GM Jobava.

Wow, amazing match, can't say anything less. This may be the hardest and tightest World Championship Match EVER! Good luck to them both :)