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Member since Sep-23-06 · Last seen Dec-16-18
Chess is a combination of the science of making accurate moves, and the art of making the opponent to make inaccurate moves.

The five most remarkable players in chess history:

1. Paul Morphy
2. Emanuel Lasker
3. Jose Raul Capablanca
4. Robert James Fischer
5. Garry Kasparov
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My homepage, dedicated to analyzing the level of chess play of various chessplayers:

I'm currently doing an analysis study, where I compare roughly 2650-rated players according to chessmetrics elo rating throughout the history of chess. The aim is to find which level of play corresponds to a certain rating in different decades.

The latest version is available here:

The methods are as follows:

I analyze games between 2600-2700-rated players. Moves by both sides are subject of the analysis. Results are displayed by decades from 1860s till 2000s. Plus, I also analyze games by 2000-2700-rated players after each 100 points from 2008 for comparisons.

The games are randomly chosen from the decades.

The start point of the analysis of every game depends on a period: 1860s-70s 8-th move, 1880s-90s 9-th, 1900s-10s 10-th, 1920s-30s 11-th, 1940s-50s 12th, 1960s-70s 13th, 1980s-90s 14th and 2000s 15th move.

The minimal length of a game is 20 moves + the start point; depending on a period it may vary from 28 to 35.

The maximum length of games is unlimited. Positions with fewer than 10 pieces are not taken into account, except blunders.

Rybka 3 Default with default settings is used for the purpose of the analysis. The time per position was 5 minutes on an older computer. Now it's 65 seconds per move.

Moves outside [-2; 2] interval are discarded.

The maximum value for an error is 4.00.

A separate engine is used to calculate the complexity of positions, Stockfish 14. The complexity of a position is determined from depths 2 to 15 and by adding differences between the eval of the best and the second best moves each time Stockfish 14 finds a new move. Differences found on the depths 10-15 are multiplied by 2.

Distribution graphs:

Contains new positions that have not been included in the study yet.

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The accuracy of famous chess players according to Blunder Check: (and the number of analysed games)

Paul Morphy 10.0% (31)
Adolf Anderssen 10.7% (10)
Louis Charles Mahe De La Bourdonnais 12.3% (18)
Alexander McDonnell 14.4% (20)
Francois Andre Philidor 21.0% (7)

>> Click here to see nimh's game collections.

   nimh has kibitzed 1787 times to chessgames   [more...]
   Sep-07-18 Paul Keres (replies)
nimh: That photo of Keres above is actually outdated by now. The open spot where the statue once was has been liquidated and a residential building is now being erected there. The new location for the statue will be much closer to the street in front of the new house, and easier to find.
   Feb-05-18 Emanuel Lasker (replies)
nimh: Estonian has 'Saksamaa' and Finnish has 'Saksa' - it clearly originates from the words 'Saxony' and 'Saxon'.
   Dec-31-17 Colle vs J J O'Hanlon, 1930 (replies)
nimh: 13...Kg6??! Instead of tucking the king back into safety, he decides to bring it further out into the open... Is it somehow linked to psychology?
   Oct-03-17 Ilmar Raud
nimh: There was no Estonian consulate in Argentine in the pre-war years, as far as I can tell after some research on the web.
   May-28-17 Hans-Joachim Federer (replies)
nimh: Keres was a very good amateur tennis player. In fact, he has got 3 third places at the Soviet Estonian tennis doubles championsips in 1945-48.
   Feb-19-17 Hillar Karner (replies)
nimh: Unfortunately he died today at the age of 81. RIP
   Jan-18-17 Kasparov vs Constellation, 1985
nimh: It's interesting that none of strongest engines at my disposal have the bishop sac among the 4 best moves at lowest available depth. Even the weakest engine on CCRL 40/40 list - Ziggurat 0.22 - never considers it. Looks like it was an evaluation issue; a very faulty one. By contrast, ...
   Dec-25-16 nimh chessforum
nimh: Thanks to both of you!
   Dec-18-16 Jeremy Lim (replies)
nimh: I think too, that the influence of European players and playing philosophy is likely the main reason, along with the adoption of zone defence, why 3p shooting has gone up. However, it doesn't fully explain ecverything. Something must have happened around 2012. Or perhaps I'm just ...
   Nov-08-16 Magnus Carlsen (replies)
nimh: <Sally> I have no objections to the noition 'trap'. Perhaps it's easier for you and others to understand than using such terms as 'difficulty of positions of 'increased levle of difficulty'. Except that it's too narrow. There are other things too, such as creating threats, ...
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