Team boss Peter Sauber labeled Kamui Kobayashi's move in the Canadian Grand Prix as over-optimistic after the Japanese crashed out of the race.
Kobayashi made a superb start from 18th position but then crashed when trying to pass Michael Schumacher at the end of the first lap. The Japanese driver bounced off the final chicane and crashed into the wall. Sauber was critical of his driver's move.
"As is often the case in Canada, it was easy to score championship points today, however, we didn't collect them," said Sauber. "We lost one car which was in 10th at the end of lap one through an over-optimistic move, and the second one through an engine failure."
Kobayashi himself said Schumacher was going too slowly and he was left with no place to go.
"This should not have happened. I had made a very good start from 18th and on the first lap was fighting with Nico Hulkenberg down the back straight for ninth.
"In front of us was Michael Schumacher, apparently having some troubles with braking before the chicane. All three of us were braking late and then I suddenly had nowhere to go. I hit the curb, the car jumped and I had damaged it so badly that I had to stop."
Teammate Pedro de la Rosa retired with an engine problem.