牛僧孺
An alternative origin theory contends that chess arose from xiangqi or a predecessor thereof, existing in China since the 3rd century BC. David H. Li, a translator of ancient Chinese texts, hypothesizes that general Han Xin drew on the earlier game of Liubo to develop an early form of Chinese chess in the winter of 204–203 BC. The German chess historian Peter Banaschak, however, points out that Li's main hypothesis "is based on virtually nothing." He notes that the "Xuanguai lu", authored by the Tang Dynasty minister Niu Sengru (779–847), remains the first real source on the Chinese chess variant xiangqi.