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"With seven races to go last year, I had the McLaren that was around half a second quicker than us at every grand prix and it was impossible to beat them, only when they had mechanical problems did we win the race.
"This year with Ferrari, some races we win and some races they win depending on the tyres and it is much more equal.
"But they don't have the mechanical problems so they get good points always and the championship is not decided."
Even though both he and McLaren's Kimi Raikkonen won seven races each last year, the Spaniard clinched the title with two rounds to spare.
While Schumacher has the momentum, Alonso recalled that the last time this season that the German won two races in a row it was followed by Alonso winning the next four.
"The important thing is how the package works every weekend, every grand prix," he said. "It is so different every race. In Canada we were winning, and yet a week later with the same car and engine we were one second down compared to Ferrari.
"This is what is going to happen for the rest of the season."