Time to recall 60 minutes

Memorizing paper

1. Computer generated numbers are presented in rows of 30 digits with 25 rows per page. (750 digits per page)
2. 5250 digits (7 sheets) are presented although more are available from the adjudicator and must be requested one month in advance of the competition.

Recall paper

1. Contestants may use the Recall Papers provided.
2. If a contestant wishes to use his/her own Recall Papers, these must be approved by the adjudicator before the competition. Contestants must write their recalled numbers in rows of 30 digits, and the rows must be clearly numbered.
3. It must be clear how the rows presented on the Recall Paper relate to the rows on the Memorizing Paper (missing rows must be clearly indicated).

Scoring

1. 30 points are awarded for every complete row that is correctly recalled in order.
2. For every complete row of 30 that has a single mistake in it (this includes a missing digit), 15 points are awarded.
3. For every complete row of 30 that has two or more mistakes (including missing digits) 0 points are awarded for that row.
4. For the last row only. If the last row is incomplete (e.g. only the first 19 numbers have been written down) and all of the digits are correct, then the points awarded will equal the number of digits recalled (19 in this example).
5. If the last row is incomplete and there is a single mistake (this includes a missing digit) then the points awarded will equal half the number of digits recalled. (For an odd number of digits the fraction is rounded up e.g. 19 the score would be 19/2 rounded up equals 10)
6. In the case of tied winning scores, the winner will be decided by looking at the extra lines the contestant has tried to recall but for which he/she got 0 points. For every correctly positioned binary number there will be given 1 decision point. The contestant with more of those decision points is the winner.

World record: 4140 digits (Ben Pridmore, World Championship 2007)

1000 championship points standard: 4000 digits

Calculation factor: 1 digit - 0.25 points