OK, there's something here I'm not quite clear on and would appreciate an explanation, please. When the median time is calculated, for the purpose of setting the 1500 level of performance, are Fehlversuch five-minute penalties included?Calavera wrote:you are assigned a "virtual" score between 0 (not solved/worst time) and 3000 (best time) with 1500 being at the median of all participants.

Second question: on the techdata page, what do the figures mean, please? I associate 6 kyu with 1500, or the median, so I'm not clear why the time listed for 6 kyu tends to be faster than the median time. Is it the case that the time listed for for 6 kyu on that page reflects an "average 6 kyu performance", i.e. half-way between the lower boundary from a 1500 performance and the higher boundary from a 1600 performance, thus the 6 kyu time reflects a 1550 performance? If this is the case, is it also true that the time listed for 7 kyu represents a 1450-level performance, and so on up and down the scale, with the time listed for 20 kyu representing a 150-level performance and the time listed for 9 dan representing a 2950-level performance?

I'll add a little more to what Calavera said about kyu and dan. When you click on someone's name on the rating list, you'll see a graph for them with three lines: a black line, which shows your rating updated every day, a green line which reflects a rolling average of your 50 last daily ratings and a red line which reflects a rolling average of your 200 last daily ratings. If you have fewer than 50 or 200 ratings, the rolling average fills up the 50 (or the 200) with lots of zeroes, which will drag it down. When the red line reaches a multiple of 100, you earn the appropriate kyu or dan title; 100 earns you 20th kyu, 200 earns you 19th kyu and so forth; 2000 earns you 1st kyu, 2100 earns 1st dan and so on up to 2900 which earns 9th dan. It took me 70 days to earn 20th kyu, and it took Thomas Snyder (mars) something like 30 days, so I suspect it will take you somewhere in between.

Titles are awarded for life, even if your rolling average sinks well below that threshold later on; this is potentially quite a strong assertion and I cannot back it up, but I have a suspicion that the overall standard of croco-puzzle solvers has improved over the years, so someone who earns 1st dan in 2012 arguably represents greater strength than someone who earnt 1st dan in 2010.

Chris

(who did, indeed, correctly fill in all the numbers and then pressed "Testen" before filling in all the black squares)