CHAMPAIGN—D.J. Richardson went into halftime Tuesday night with three points and his Illini looking for a way to get past Yale.No. 19 Illinois found it. Richardson scored 13 second-half points and Illinois played smothering defense, holding the Bulldogs to 27 percent shooting in a 73-47 win.Demetri McCamey added 11 for the Illini and Mike Tisdale had 10 points and a game-high 13 rebounds.Illinois led 30-17 at the half, but needed Richardson’s second-half shooting to put the Bulldogs away. Richardson was 6 for 8 from the field and 3 for 4 from the 3-point line.Yale, coming off a 75-67 upset of Boston College last week, stayed close to Illinois for much of the night.But the key to the Bulldogs win over B.C. was 11 for 17 3-point shooting, including 6 for 9 by Austin Morgan, who had 25 points against the Eagles.Yale couldn’t duplicate that effort on Tuesday.The Bulldogs were 4 for 20 from the 3-point line.Still, Yale closed within 40-31 with 15 minutes to play when Morgan hit a 3-pointer.But the Illini quickly widened the gap over their next three possessions, turning a dunk by Mike Davis and a 3-pointer and a short jumper by D.J. Richardson to a 47-31 lead with 13:41 to play.Yale got no closer.The Illini shot 61 percent in the second half, and tightened their defense over the final 15 minutes. That included holding Yale to five points over a seven-minute span as Illinois stretched the lead to 22 points at 58-36.