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Play it 100 times. Or more. Ricardo Morales was quoted as suggesting this. A passerby once stop and listened to Vladimir Horowitz practicing, and reported that the great pianist spent over two hours intensely focused on a single bar. For another example, as one of the young Sviatoslav Richter's early lessons with great teacher Heinrich Neuhaus, he was assigned Liszt's Sonata, a monumental and demanding work; the next week when Richter played if for Neuhaus, the teacher pointed to a passage known as one of the piano literature's touchstones for difficulty, and he asked how Richter had dealt with it . . . Richter said he just kept repeating it until it came out right.