《定式与战理》中“左马盘河红平车捉马式”中的一个疑问

梅桔

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[DhtmlXQ_title]第三章  中炮过河车对屏风马左马盘河　第一节  黑飞右象型  第40局　红平车捉马式[/DhtmlXQ_title]
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[DhtmlXQ_result]未知[/DhtmlXQ_result]
[DhtmlXQ_open]C37 中炮过河车互进七兵对屏风马左马盘河[/DhtmlXQ_open]
[DhtmlXQ_remark]阎文清，张强[/DhtmlXQ_remark]
[DhtmlXQ_author]陈勇[/DhtmlXQ_author]
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[DhtmlXQ_comment13]　　平车捉马，力图减少黑方反击，以便稳步进取。[/DhtmlXQ_comment13]
[DhtmlXQ_comment15]　　跃马河口，抢占要位。对炮八平九，黑可车１平２，车九平八，炮２进１，从容取得对抗之势。||    如此黑方有两种着法：(甲)炮８平７；(乙)士４进５。分述如下：[/DhtmlXQ_comment15]
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请教对于第８回合注解“跃马河口，抢占要位。对炮八平九，黑可车１平２，车九平八，炮２进１，从容取得对抗之势。”红如走炮九进四，不是可以占优吗？

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[DhtmlXQ_title]第三章  中炮过河车对屏风马左马盘河　第一节  黑飞右象型  第40局　红平车捉马式[/DhtmlXQ_title]
[DhtmlXQ_result]未知[/DhtmlXQ_result]
[DhtmlXQ_open]C37 中炮过河车互进七兵对屏风马左马盘河[/DhtmlXQ_open]
[DhtmlXQ_remark]阎文清，张强[/DhtmlXQ_remark]
[DhtmlXQ_author]陈勇[/DhtmlXQ_author]
[DhtmlXQ_movelist]77477062796780708979102226256364797362541927204273535466170700100919121307036647[/DhtmlXQ_movelist]
[DhtmlXQ_comment13]　　平车捉马，力图减少黑方反击，以便稳步进取。[/DhtmlXQ_comment13]
[DhtmlXQ_comment1_15]　　跃马河口，抢占要位。对炮八平九，黑可车１平２，车九平八，炮２进１，从容取得对抗之势。||    如此黑方有两种着法：(甲)炮８平７；(乙)士４进５。分述如下：[/DhtmlXQ_comment1_15]
[DhtmlXQ_type]实战全局/开局[/DhtmlXQ_type]
[DhtmlXQ_owner]陈勇[/DhtmlXQ_owner]
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梅桔

有道理！