Golfer Tiger Woods spent nearly an hour playing blackjack on a casino riverboat in Davenport, Iowa, despite being too young to gamble legally, the Quad Cities Times reported yesterday.

An Iowa Racing and Gaming Commission official said the casino operator will not face any penalties because a security guard checked Woods's identification.

Tom Peters, the agency's representative on the Lady Luck casino, said there are two possibilities to explain why Woods -- who is 20 -- was able to board: Either the security guard misread the ID card or it was altered in some way to make it appear that Woods was 21.

"No one should be under the assumption that we saw Tiger Woods coming and didn't bother to check for {identification}. That is not the case," said Jim Prescott, a casino representative. "Quite frankly, I'm not sure that the guard would know Tiger Woods if he walked up to him."

Peters said he has reviewed the surveillance tapes of Woods's visit to the boat on the evening of Wednesday, Sept. 11. He said a man who appears to be Woods spent about 42 minutes on the Lady Luck and played blackjack on the boat's lower deck. He did not drink alcohol, Peters said.

Peters said the security tapes show that Woods approached the boat with three other people, two older people, whose identification cards were not checked, and a younger man who was turned away by a security guard because he was not 21.

Woods's ID card was checked and he was allowed to enter the boat.

Woods played in the Quad City Classic golf tournament, a PGA event, that began Sept. 12. He is playing in the Texas Open this week and did not return messages left by the Associated Press with PGA Tour officials there.