It was the last step in a recovery on a day when several players had a chance to win. Forrest made three bogeys on the front nine, then worked back to even par for the round with a birdie at the par-five 14th. His closing birdie completed four rounds of 66, 67, 67 and 70 at Club de Campo Villa de Madrid.
Chacarra gave the home crowd its strongest challenge. Playing through a broken toe, he shot 66 and birdied the 18th to set the clubhouse target. His early charge included an eagle at the seventh, but a bogey at the par-three 17th left him needing the closing birdie just to reach 13 under.
The same stretch hurt other contenders. Jacob Skov Olesen bogeyed the 17th and finished fourth. Joe Dean, who began Sunday tied with Forrest for the lead, dropped a shot at the 16th and ended tied for fifth with Dan Brown. Brown closed with five consecutive birdies for a 64, the lowest round of the day.