Individual Calculations September 2009
 Chahrani, Ibrahim  Total change: -22.50  Rating chartPersonal card
 2009 African Individual Chess Championship (gen) Tripoli LBA 2009-07-21
 2232 2280 3.00 8 -1.50 15 -22.50 
  Amin, Bassem g2551 EGY0.5010.33154.95 
  Asabri, Hussien f2220 LBA0.501-0.0815-1.20 
  Humrana, Mostafa 2114 LBA0.001-0.7215-10.80 
  El, Kamel Adel Mahmoud 2239 TUN1.0010.44156.60 
  Kobese, Watu m2391 RSA0.001-0.3515-5.25 
  Oatlhotze, Providence 2164 BOT0.001-0.6615-9.90 
  Solomons, Deon c2210 RSA0.001-0.6015-9.00 
  Al-Zayat, Ahmed 1969 LBA1.0010.14152.10 

Rc - average rating of rated opponents, Ro - rating of a player in a tournament, Rp - rating performance of an unrated player, W - points won in a tournament against rated opponents, N - total number of games against rated opponents, Change - change used for calculation according to formula, K - development coefficient, Kchg - rating change of a player calculated as (K * change)


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