Scheck wanted to sell a parcel of his real property. He made an offer to pay a commission to Marchiondo, a real estate broker, if Marchiondo caused the sale of the property to a particular buyer within six days. However, Scheck revoked his offer to Marchiondo on the morning of the sixth day. Later that day, Marchiondo obtained the prospect’s acceptance of Scheck’s offer, but Scheck refused to pay the commission. Marchionado sued, claiming the offer could not be revoked because he had begun performance. The trial court dismissed the complaint, stating that Scheck could revoke his offer at any time before completion of the requested act. Marchiondo appealed. Who should win the case? (Marchiondo v. Scheck, 78 N.M. 440, 432 P.2d 405)