Question: What type of surface is the all-england championships at wimbledon played on?
qaPairs: question: What general type of surface is the all-england championships at wimbledon played on?
answer: grass
outdoor grass courts
Grass outdoors
question: What type of grass was the all-england championships at wimbledon played on before 2002?
answer: 70% ryegrass and 30% Creeping Red Fescue
question: What type of grass is the all-england championships at wimbledon played on since 2002?
answer: 100% perennial ryegrass