In this module you will find five different levels, from beginners to master level, set for the usual rating limits (1000, 1400, 1800, and 2100). At the master level there is the theoretical number of 3000. Chess problems are given at random order out of the given level problems, and when you enter, you will have the first chess problem immediately.

Solution:
Solution is always the strongest, the best continuation. For example, if there is mate in one and mate in two, the mate in two is not the solution to the problem. If you can win a rook or a pawn, which leads to a winning position, too, but it lasts longer, only the winning of the rook is the solution, the other one is not.

Evaluation:
Each step of the puzzle is pointing to a red or black star rating, depending on whether a good or bad solution is made. The first, the key step is 4 points, the other one points 1 point (red star). The wrong solution will be the same number of black stars. Help request (the Go! button) is a black star, at the key step four black stars. By clicking on the 'SOLUTION' button, four black stars are the rewards. The program evaluates the solution between 0 and 100 (percentage) based on good and faulty steps (blue number). There is no time limit, but takes account of the elapsed time when calculating the value number. Each puzzle has a time limit within which a plus 10 points will be added, with minus 20 points being exceeded. Timeline: + 15sec for good solution, + 5sec for bad solution. For one-step puzzles this is 1 minute.

Rating:
After the registration, everybody starts from 1000 points and everyone has only one rating, independently of the level. When you change levels, the program will approximately adjust your rating to the level, depending on your score, after solving a couple of problems. At the same time, it will add a percentage which refers to the result at the given level. The normal value should be around 100 %. If it is too high or too low after solving some problems, it is advisable change levels into the suitable direction.

Have a nice game and a useful pastime: the authors.