The Kansas City Chiefs listed running back Jamaal Charles as questionable for Sunday's game against the Dolphins in Miami. According to the league's injury guidelines, that means Charles has a 50-50 chance of playing. Charles practiced on Friday for the second straight day after sitting out Wednesday's workout. Charles suffered what the Chiefs called a high ankle sprain in last weekend's game against the Broncos in Denver. "He did practice and he moved around and did a decent job," coach Andy Reid said. "We'll see how it all works out. He looked a little sore but he did OK. He worked yesterday but he loosened up.