SAN FRANCISCO -- San Francisco 49ers coach Steve Mariucci was not happy the Washington Redskins, under new coach Steve Spurrier, kept throwing late in a 38-7 rout of the 49ers in the preseason opener Saturday night. After the game, he told some Washington coaches, "We'll see you in six weeks."

The 49ers and Redskins play in the regular season in Week 3 on Sept. 22 in San Francisco.

The San Francisco 49ers' rookies and defensive reserves looked frighteningly unprepared for the NFL during the Washington Redskins' 38-7 exhibition victory in Osaka, Japan, last weekend -- but there was a good reason, the Niners' coach said.

Mariucci stewed on the San Francisco sideline as Washington's first-string offensive line helped the Redskins widen their lead in the second half against the 49ers' fringe players and roster hopefuls.

''It was a different sort of a preseason game that way, from that standpoint,'' Mariucci said Monday night. ''You've got to look at what the Redskins were trying to accomplish. I know the Redskins wanted to start off with a bang and come away feeling good and getting the organization and the players and the fans excited.

''By playing their (first-string) guys a bit longer, they tried to accomplish that. The teams had two different goals in mind, I think. But when you come away from it feeling you got a lot of those things accomplished without looking at the score, it was worth doing.''

In all, the Redskins passed for 434 yards -- almost all of it after the 49ers' starting defensive backs left the game late in the first quarter.

Spurrier, who ran up the score with flair and impunity during his 12 seasons at Florida, used every opportunity to showcase the potential of his wide-open offense. Spurrier said he kept charging for the end zone after halftime to give identical game conditions to quarterbacks Sage Rosenfels and Danny Wuerffel.

By contrast, Mariucci didn't run a single play that the Redskins couldn't have seen on game film from last season. That's because the teams meet on Candlestick Point on Sept. 22 -- first-string against first-string this time.

''To get some things accomplished, sometimes you've just got to turn away from the score and stay to the plan and force yourself to play the guys that you've absolutely got to see,'' Mariucci said. ''Our starters would have loved to stay in there. Our defense was feeling really good. They didn't like it, but that was our plan, and I stuck to it.''

The Associated Press contributed to this report.