Listen to the clips below of competitors' thoughts from 2015 and previous years.
Jonelle is the leading Kiwi after the cross country in 6th having picked up just over 8 time faults.
Pippa Funnell is left frustrated after a run out on Or Noir de la Loge leaves her down the field.
The British rider has the only clear round inside the time on Cross Country day and lies in 4th going into Sunday's Show Jumping.
The Oxfordshire based rider leads by 1.5 penalty after the Cross Country following an exclellent round on Fenyas Elegance, picking up just 4 time faults.
Eric gives his reaction to the Cross Country day which saw only 1 rider go clear inside the time and many big names struggling.
An impressive round with only 5.2 faults to add catapaults the rider who is based with William Fox-Pitt up the leaderboard.
The Canadian rider is delighted after picking up 17.6 time faults around the very testing Cross Country course.
Oxfordshire's Charlotte Agnew scored 42.9 penalty points to put her on 87 penalties overnight with Out of Africa.
The Gloucestershire based American picks up just 2.8 time faults to be on a score of 45.5.
The American rider picks up time faults with Ben but is still pleased
Blenheim Palace Horse Trials Office: Blenheim Palace, Woodstock, Oxon, OX20 1PS Tel: 01993 813335