question: When did Beijing lose to Li Zicheng 's rebel forces and the Manchu-led Qing dynasty ?
answer: 1644
turker_answer: Beijing lost to Li Zicheng 's rebel forces and the Manchu-led Qing dynasty in 1644 .
rule-based: Beijing lost to Li Zicheng 's rebel forces and the Manchu-led Qing dynasty in 1644 .