对弈程序是个系统工程，它是以下四个系统的有机结合：(1) 棋盘结构，(2) 局面评价，(3) 搜索技术，(4) 其他。-Chess program is a systematic project, which is an organic combination of the following four systems: (1) board structure, (2) situation assessment, (3) search technology, (4) other.