The phrase "able to play effectively" is correct and usable in written English.
You can use it when discussing someone's capability or skill in performing a task, particularly in a context related to games, sports, or any activity requiring proficiency.
Example: "After months of practice, she is finally able to play effectively in competitive matches."
Alternatives: "capable of playing well" or "skilled at playing".
The best the Knicks can hope for in Game 3 is having three starters — Stoudemire, Billups and Turiaf — able to play effectively despite their pain.
Although cornerback Corey Webster broke his right hand, Coughlin expressed optimism that he would be able to play effectively with a cast.
to be able to play effectively Rooney was always keen to be involved, and certainly never hid, but his enthusiasm often led to imprecision, his haste often slowed England down.
You start out only able to play effectively from the shortest tees and then improve your distance and other golf skills until you can eventually play from the longest ones.
In a series between two familiar rivals that offers little potential for surprise, one significant question looms over the Knicks-Miami Heat matchup that begins Sunday: will Tim Hardaway, who has a sprained left foot, be able to play effectively, and if not, can the Heat still win?
But how has he been able to play so effectively with his turf toe? "It's just emotion," Shockey said.
While Dajuan Wagner of Memphis is not a true point guard -- he plays more like Philadelphia's Allen Iverson -- he may be able to play the position effectively.
They are also tactically flexible, able to play both 4-4-2 or 4-2-3-1 effectively, as they demonstrated with 2-1 victories home and away against Tottenham Hotspur in the group stage.
The former executives, who spoke on the condition of anonymity in order to preserve relationships with former colleagues, said that a big question was whether Mr. Page would be able to play that internal management role effectively, and if not, whether he would hire a chief operating officer — which Google has not had — to handle it.
People would effectively be able to play the world.
Later Bembry noted that he was a power forward who was able to play center, adding that at Michigan he was "most effective playing with his back to the basket" but could also pass effectively and hit medium-range jumpers.
