Speaking to The Sun, the chef said that the new format - a move which encountered criticism from regular viewers of the BBC One show - rewards people with a breadth of knowledge about cooking.
He said: "People try to beat the system. It's human nature. Then you don't end up with a competition because they will try to work out how the format works at each stage.
"In the last series people would do that and you would then find they didn't have the breadth of knowledge to back it up. That's what we don't have this series."
Torode has previously said that under the previous format, some promising contestants had "lost their nerve" during the invention test.
Four contestants - research analyst Jackie, intensive care nurse Sara, food buyer Tim and advertising account director Tom - remain in the competition.
MasterChef airs on Wednesdays at 9pm on BBC One.
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