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||Guest||Lex||Max|
|4092||28/04/2006||P||Helen Shutler||42 – 110||Jon Corby||Rick Wakeman||Susie Dent||135|
|4093||1/05/2006||P||Jon Corby||95 – 65||Margaret Hillman||Rick Wakeman||Susie Dent||121|
|4094||2/05/2006||P||Jon Corby||109 – 51||Andy Willets||Rick Wakeman||Susie Dent||117|
|4095||3/05/2006||P||Jon Corby||97 – 82||Jack Welsh||Rick Wakeman||Susie Dent||122|
|4096||4/05/2006||P||Jon Corby||118 – 57||Carol Parker||Rick Wakeman||Susie Dent||131|
|4097||5/05/2006||P||Jon Corby||128 – 61||Chris Bailiffe||Richard Stilgoe||Susie Dent||141|
|4098||8/05/2006||P||Jon Corby||102 – 44||Len Oakes||Richard Stilgoe||Susie Dent||131|
|4099||9/05/2006||P||Jon Corby||97 – 51||Terry Norman||Richard Stilgoe||Susie Dent||126|
|4107||19/05/2006||QF||Jon Corby||77 – 66||Christine Armstrong||Richard Digance||Susie Dent||128|
|4111||25/05/2006||SF||Jon Corby||78 – 94||Matthew Shore||Richard Digance||Susie Dent||122|
|4735||14/01/2009||CP||Jon Corby||92 – 52||Richard Brittain||Andrew Sachs||Susie Dent||112|
|4743||26/01/2009||CQF||Jon Corby||96 – 62||Jonathan Coles||Paul Zenon||Susie Dent||117|
|4746||29/01/2009||CSF||Charlie Reams||110 – 76||Jon Corby||Paul Zenon||Susie Dent||132|