Weichi wrote:Hi, Adum. Right now, the difficulty of auto selected problems varies too much from question to question when I try as an unregistered user. For example, when the estimated rank of a player is 12k, the system may give him a question of 6d, and then give him a question of 20kyu. If our best guess of a player's rank is 12k, I think we should give him a question of 12-3 to 12+3 kyu. Any questions that are more than 3 ranks away from a player's true rank will not be informative about the player's ability, because according to most standard rating systems, the probability that the player solves these problems will either be almost 100% or 0. Besides the inefficiency of the estimation algorithm, the playing may be frustrating or boring to the player because the questions are either too hard or too easy.
Put it another way, we wouldn't ask a 12k player to play with a 6d or a 20k player for obvious reasons, so maybe we should not let the 12k player "play" with a a 6d or a 20k problem.
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