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With ORTF miking, you place a pair of cardioid mics about 6.69 inches apart and facing outward at a 110-degree angle The mics are aimed at the left and right edges of the sound source.
ORTF is pretty easy to use and gives good spatial definition. ORTF works better with small-diaphragm condenser microphones (like the ones in our pictures) than with large-diaphragm microphones, which have a weaker off-axis response. I like to experiment between the ORTF technique and the XY technique to see which gives a better recorded piano sound.
