Система Койя

Система Койя — метод определения лучшего результата (коэффициента) в случае, если несколько участников шахматного турнира набрали одинаковое количество очков.

Описание

Система Койя учитывает число очков, набранных против всех соперников, которые достигли результата 50% или более (то есть набрали более 50% максимально возможных очков). Применяется в круговых турнирах[1].

Система Койя может быть расширена шаг за шагом с включением очковых групп, имеющих менее 50% очков, или сокращена шаг за шагом с исключением игроков, набравших 50% и больше очков. Тогда она называется, соответственно, расширенной или сокращённой системой Койя[2].

Пример

Итоговая таблица гипотетического кругового турнира:

№ Участники 1 2 3 4 5 6 7 + − = Очки Место СК
1 Иванов ½ ½ 1 1 1 1 4 0 2 5 I 2
2 Петров ½ ½ ½ 1 1 1 3 0 3 4½ II 1,5
3 Сидоров ½ ½ ½ ½ 1 1 2 0 4 4 III 1,5
4 Кузнецов 0 ½ ½ 1 1 1 3 1 2 4 IV 1
5 Смирнов 0 0 ½ 0 1 1 2 3 1 2½ V 0,5
6 Васильев 0 0 0 0 0 1 1 5 0 1 VI 0
7 Николаев 0 0 0 0 0 0 0 6 0 0 VII 0

Обозначения: 1 — победа, ½ — ничья, 0 — поражение, СК — Коэффициент по Системе Койя.

Участники Сидоров и Кузнецов набрали одинаковое количество очков, по 4 очка. Кто из них займет третье место, решается по системе Койя.

Коэффициент по системе Койя участника Сидорова вычисляется так: 0,5 (количество очков, набранных против Иванова) + 0,5 (против Петрова) + 0,5 (против Кузнецова) = 1,5.

Коэффициент по системе Койя участника Кузнецова вычисляется так: 0 (за поражение от Иванова) + 0,5 (количество очков, набранных против Петрова) + 0,5 (против Сидорова) = 1

Примечания

  1. ↑ Словарь шахматных терминов. Дата обращения: 22 августа 2015. Архивировано 30 июля 2015 года.
  2. ↑ Один игрок – один номер. Дата обращения: 22 августа 2015. Архивировано 16 марта 2015 года.

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