About 800 years after the birth of Christ, chess was well known in the Arabic World. Al-Adli was the greatest known player of that age until 847. He was the closest friend of the caliph, a poet, and a minister-like official.
The game was a bit different than the modern chess we know. The initial setup was the same, as well as the king, the knight and the rook. The queen was the weakest piece because it could move one square and in diagonals only. Bishop moved in diagonals, but only two sqares, and could jump over pieces, didn't attack and didn't defend the nearest four squares. Pawns could move one step only and there was neider castling.

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Players can use more different time controls in the club. 10/30 - This is the default time control. Club level tournaments and games by pairing use this one. Here 10 moves must be taken in 30 days. Clocks start with 30 days, the thinking time is always subtracted from them, but another 30 days are added at every 10th move. The maximum the clocks can show is 40 days. 10/40 - This is a bit slower time control. 10 moves must be taken in 40 days, the addition is 40 days, and the maximum is 50 days. 10/50 - More slower, 50 days for 10 moves, 50 days addition at every 10th move, the maximum is 65 days. 5+1 - This is a faster one. Here the clocks start with 5 days on them. The used up thinking time is subtracted also, and 1 day is added at each move. The maximum is 30 days here too.
The server manages the clocks, it calculates the thinking times, adds, subtracts, and does everything. Records everything in the game logs.
If a clock runs out of time, the player will be considered as being on an unannounced vacation. If it elapses also, he'll loose the game, the opponent can claim result.

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