哪一个是主变？

afool

[DhtmlXQ] [DhtmlXQ_ver]www_dpxq_com[/DhtmlXQ_ver] [DhtmlXQ_init]520,450[/DhtmlXQ_init] [DhtmlXQ_movelist]63339GZM000032331JXD000164349GZM000233631JZP000388681CZG000486469TZL000557485IYK000658481NZL000768481GZK000863651PXF000987653CXG00106757BPZN001134389MYI001246449LYF001347293KYO0006[/DhtmlXQ_movelist] [DhtmlXQ_binit]88nn875749nn47nn656463nnnn41nnnn58nnnnnn30nnnn6832nn86nnnn67nnnn[/DhtmlXQ_binit] [DhtmlXQ_title]精忠报国[/DhtmlXQ_title] [DhtmlXQ_type]残局[/DhtmlXQ_type] [DhtmlXQ_result]未知[/DhtmlXQ_result] [DhtmlXQ_comment7]这个能算主变吗？||[/DhtmlXQ_comment7] [DhtmlXQ_comment14]和||[/DhtmlXQ_comment14] [DhtmlXQ_comment15]黑又如何应付呢？||[/DhtmlXQ_comment15] [/DhtmlXQ]

afool

以上是《棋艺》某期封面棋局，后有棋迷朋友向我提出，红第四回合改走飞相，变化比较复杂。希望各位高手帮助。