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Competition Rules and DD Master Points Scheme

It is possible that several minor issues are not resolved in the following rules, which are therefore subject to minor revisions and additions from time to time.  Please feel free to e-mail the webmaster if you think of something that you would like to see addressed or clarified.

1. To enter the scheme or make progress in it, you must submit a correct solution to a Competition Problem before the closing date.  It is assumed that you solve without using a computer program for that purpose.  Normally, the closing date is one month after the problem's appearance on the front page, but the webmaster may vary this from time to time.

2. Successful solvers (and the composer of the problem) are awarded DD Master Points, according to the Difficulty Rating of the problem, ranging from one to eight.  The DR is determined by the webmaster, based on suggestions from solvers among other things.  There are also Star Points for special solving or composing endeavour.  Solvers get two star points when the DR is eight, one when it is seven. Composers get two star points when the DR is more than four, otherwise one (but none at all if the problem is "cooked" or insoluble).

3. Whoever scores the largest number of DD Master Points in a given calendar year is proclaimed Problemist of The Year for that year.  Star Point scores are used, where possible, to resolve ties.  If there is still a tie, it is resolved at the webmaster's discretion (for example, solvers are usually favoured over composers.)

4. Thanks to DD solving programs that are available these days, unsound problems are unlikely to appear.  However, mistakes might still be made.  A solver who thinks a problem has no solution may submit a substantiated claim to that effect.  If this turns out to be right, only such entries will qualify for master points. A solver who thinks there is more than one solution (i.e., no single important variation is unique) may say so. If this turns out to be right, that solver will get one or two additional Star Points; if it is wrong, the solution is deemed to be incorrect.

5. Solvers are awarded certificates when they achieve certain rankings during their lifetime accumulation of master points and star points. These are: Problemist (50 MPs), Expert Problemist (100 MPs), Master Problemist (200 MPs, 5 SPs), Life Master Problemist (400, 10) and Grand Master Problemist (750, 25).

DDC Home Problemist tables Previous competition problems
Problem archive George Coffin's collection