Many years ago, searching for the Internet over chess problem, I bumped into a very interesting piece.
Find it on the bottom as a FEN row, clicking on it the board will also appear.

The task is: white mates in one!

Can't be too hard, I thought, but scrolling over the possibilities the solution just didn't come up.
I check everything once more, then again, and again, and once I found another way that was hidden for me before. The solution also hid there. It became my favourite chess problem then, but of course, it's true, there are many many beautiful problems out there.

This was the first problem I submitted to the server. Some players can solve it, some don't. Some believe there is no valid solution.
So, check this problem if you want. And enjoy.

The following list contains all the stories gathered from here and there.
Click on any of them.

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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