項(xiàng)羽坐失良機(jī)：秦末,劉邦和項(xiàng)羽先后進(jìn)入咸陽(yáng),其時(shí)項(xiàng)羽率部40萬(wàn)駐新豐鴻門,劉邦率部10萬(wàn)駐霸上,兩軍相距很近,此時(shí)項(xiàng)羽消滅劉邦勢(shì)力易如反掌.在 “鴻門宴”上,項(xiàng)羽若聽(tīng)謀士范增之言殺掉劉邦也如囊中探物,可項(xiàng)羽沽名釣譽(yù),聽(tīng)信項(xiàng)伯“仁義”之說(shuō),放走當(dāng)時(shí)處于絕對(duì)劣勢(shì)的對(duì)手,并封劉邦為“漢王”.旋從咸陽(yáng)引兵東歸彭城,打算回鄉(xiāng)炫耀一番,以致后來(lái)反為劉邦所滅.項(xiàng)羽最后兵敗身亡的悲劇,固然還有其他許多主客觀因素,但與他當(dāng)初在鴻門坐失良機(jī)不無(wú)關(guān)系.當(dāng)項(xiàng)羽在鴻門放走劉邦時(shí),范增就曾忿然感慨地說(shuō)：“實(shí)在不能與這小子（實(shí)指項(xiàng)羽）謀劃大事,將來(lái)奪取項(xiàng)羽天下的,必定是劉邦,我們都將成為劉邦的階下囚.”