Dmitriy Ivanovich Mendeleev (1834-1907) is best known for devising the Periodic Table of Chemical Elements.
He loved to play chess, among other games, and correspondence chess too. A beautiful but hard chess problem follows from him from July 4, 1889, white mates in two:
The game is the most exciting, when the two players are on the same playing strength. If the difference is too high between their strength, then one player will see the same game boring, that the other will see annihilating.
The playing strength are defined by the elo rating, its value is usually between 800 and 2600 points. Players are divided into different classes according to their playing strength, their elo rating. Players in the same class are in similar playing level. Tournaments are usually class based, so players in the same level play each other in tournaments (mostly).
The following classes are defined in the club:
Class M
2200-
Class X
2000-2199
Class A
1800-1999
Class B
1600-1799
Class C
1400-1599
Class D
1200-1399
Class E
1000-1199
Class F
000-999
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