这个残局怎么解？

蒙古高原

下图是我校两位老师下成的残局图，轮黑棋先走，大家讨论了很久，没有定论。（注：黑炮除在原位外，还可摆在1、2、3、4、5、6六个点，结论是否一样？）请各位高手不吝赐教！

zhaodi

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蒙古高原

黑方应当胜不了呀