He won all eight of his heat games in impressive fashion, amassing an impressive 856 points and returning for the final rounds as #2 seed. He beat Christine Armstrong impressively in the quarter-final in a low scoring contest, but lost to eventual runner-up Matthew Shore in the semi-final on the crucial conundrum GASPFROWN which Shore turned into FROGSPAWN. As the competitiors for Championship of Champions XII had been decided before Corby's octochamp run, he did not participate, but competed in the Championship of Champions XIII.
In his first round match, he beat Richard Brittain and held him to just 52 points after his famous conundrum guess of GANDISEEG. In the quarter-final, he faced Jonathan Coles and again won comfortably without facing a crucial conundrum. In the semi-final, he faced Charlie Reams. Reams put on a strong performance, scoring in every round apart from the conundrum, including five eight-letter words in a row - a Countdown record. Corby couldn't keep up, and eventually lost 110 – 76. Corby also used his Countdown run to raise money for charity.
|#||Date||Type||Contestant 1||Score||Contestant 2||Presenters||Guest||Lex||Max|
|4092||28/04/2006||P||Helen Shutler||42 – 110||Jon Corby||Des Lynam||Carol Vorderman||Rick Wakeman||Susie Dent||135|
|4093||1/05/2006||P||Jon Corby||95 – 65||Margaret Hillman||Des Lynam||Carol Vorderman||Rick Wakeman||Susie Dent||121|
|4094||2/05/2006||P||Jon Corby||109 – 51||Andy Willets||Des Lynam||Carol Vorderman||Rick Wakeman||Susie Dent||117|
|4095||3/05/2006||P||Jon Corby||97 – 82||Jack Welsh||Des Lynam||Carol Vorderman||Rick Wakeman||Susie Dent||122|
|4096||4/05/2006||P||Jon Corby||118 – 57||Carol Parker||Des Lynam||Carol Vorderman||Rick Wakeman||Susie Dent||131|
|4097||5/05/2006||P||Jon Corby||128 – 61||Chris Bailiffe||Des Lynam||Carol Vorderman||Richard Stilgoe||Susie Dent||141|
|4098||8/05/2006||P||Jon Corby||102 – 44||Len Oakes||Des Lynam||Carol Vorderman||Richard Stilgoe||Susie Dent||131|
|4099||9/05/2006||P||Jon Corby||97 – 51||Terry Norman||Des Lynam||Carol Vorderman||Richard Stilgoe||Susie Dent||126|
|4107||19/05/2006||QF||Jon Corby||77 – 66||Christine Armstrong||Des Lynam||Carol Vorderman||Richard Digance||Susie Dent||128|
|4111||25/05/2006||SF||Jon Corby||78 – 94||Matthew Shore||Des Lynam||Carol Vorderman||Richard Digance||Susie Dent||122|
|4735||14/01/2009||CP||Jon Corby||92 – 52||Richard Brittain||Jeff Stelling||Rachel Riley||Andrew Sachs||Susie Dent||112|
|4743||26/01/2009||CQF||Jon Corby||96 – 62||Jonathan Coles||Jeff Stelling||Rachel Riley||Paul Zenon||Susie Dent||117|
|4746||29/01/2009||CSF||Charlie Reams||110 – 76||Jon Corby||Jeff Stelling||Rachel Riley||Paul Zenon||Susie Dent||132|