An ELO rating is the result of statistical calculations designed to measure the playing strength of players. These methods were developed by Arpad Elo and are named after him. The ELO system is in almost universal use and has been further refined by others, notably Glicko, but is still named after its creator.
In devising the ELO scale, some premises were used that are worthy of note. It was decided that a rating of 2000 would be the equivalent to scoring 50% in a US Open Championship. It was also decided that a player's rating would never be negative.
Importantly, the standard deviation was fixed at 200 points. This means that if a player's true strength is 1500, he will score around 68% of his results within the range of 1400 to 1600 (as measured by performance formulae).
Another result of fixing the standard deviation at 200 points is that it also defines playing categories. For example, most International Masters and Grandmasters are in the 2400 - 2600 category, most national masters in the 2200 - 2400 category. Those in the 2000 - 2200 category are called Experts, or Candidate Masters.
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Saying the truth, mis-writing a move in correspondence chess can be fatal for the game.
But it depends, if the miswritten move is still valid or not fully valid. For example if the check mark (+) is missing, our opponent can reject the move, and can send it back to us for correction.
But if we have two knights, one can move to e4 and the other one can move to e5, mis-writing 12.Ne4 to 12.Ne5 can be fatal, and there is no way to proof we wanted to move the other knight.
This is a problem, that can be solved in server based correspondence chess, that this club offers.
By default the server is very indulgent in accepting moves, it accepts invalid moves if they are still unambiguous, adds check and capture marks, doesn't require the move number, etc. This is for reducing the number of rejected moves, but it results that some miswritten moves are not rejected, and are accepted as a different move.
Those players who manually compose their move messages, and therefore sometimes miswrite their moves may find the StrictMode setting useful.
If they turn it on, the server will accept only fully valid, complete moves exactly as shown in the next example:
Move 1234 12.Nd2-e4
In strict mode the server requires the move number, one dot as white and three dots as black, the piece letter (even at pawns), the from square, the capture mark or hyphen, the target square, and the check mark if needed. If any of these parts is missing, or the whole move is invalid the server rejects the move.
This way the chance that a miswritten move can be valid as an other move is lowered quite dramatically.
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