My TV Debut! Watch and see how I get on :) The presenter is Shane Richie (from Eastenders, amongst other things). I'm on the whole show but my main bits are from about 26:00 mins if you've got no attention span.
So there's two ways to approach this name: 1. Literal meaning: "Decimate" means "severely destroy something", which, if you don't get a question right your prize is "decimated". 2. If you watch the show, number 10 comes up here and there. This is because "Deci" is also a prefix for "one-tenth", as in the prize is divided into 10.
Fairly simple - the game starts with £20,000 in play, split up among 10 columns (so £2,000 each). Each member of the team faces the initial round, which goes like this: 1) 10 keywords are shown, with 20 seconds for the team to discuss questions that may relate to the keywords 2) 10 questions are asked, in which the keywords, in the order presented, have some relation to the question 3) The player may answer or Pass Back to the other team members to answer for them (the team gets only 5 passbacks over the 3 rounds). If the player does answer, the other team members may use an Overrule to change the answer (Just like the passbacks, the team only gets 5 Overrules) 4) Correct answers light up a column, protecting the money in said column, wrong answers remove the money in that column, eliminating 1/10 of the current prize fund. 5) After the round is over, the money is redistributed so 10% of the remaining prize is in each column, and the round is repeated until all three members have played. After all 3 initial rounds, the remaining prize is split into 10 one more time for the final. The team chooses one member to start, and as a team, they have 2 minutes to complete all 10 columns, with no passbacks or overrules allowed. There are up to 3 questions on each keyword, a correct answer on any of the three moving onto the next column, but getting all 3 questions wrong decimates the column, and the next team member must step forward to pick up on the column their teammate left off at, with a new keyword. If all 10 columns are completed, the team splits the remaining money in the prize fund, but if all three team members are eliminated or time runs out, all the money is lost.