As both sides reached a stalemate at Guandu and Cao Cao's forces ran out of supplies, Xun You advised Cao Cao, "Yuan Shao's supplies will be reaching in one day.
Ketika kedua belah pihak mencapai jalan buntu di Guandu dan pasukan Cao Cao kehabisan persediaan, Xun You menyarankan Cao Cao, "Persediaan Yuan Shao akan mencapai satu hari.