第2章 斗转星移奇数算
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此题斯惟云已演算了多日，亦知是道繁复之题，当下作揖道：“改日定向王妃请教。”
卿尘笑道：“我也只是初窥门径，谈不上请教了。”见斯惟云喜研算数，便说道：“前些时候见了道有趣的题，斯先生若有兴趣，不防研究一下。”说罢在纸上列出一道天元算题来，此题一出，身旁左原孙忍不住道：“二十八星宿周天解？”
卿尘暗中奇怪，这题是她在大内文澜阁收藏的一本《九周算经》中看到的，左原孙怎会知道？脑中突然一闪：“是了！《九周算经》之后有一章附论，将这二十八星宿周天解的题演出一列阵法，可是左先生的手迹？”
这《九周算经》本是当今圣上胞弟景王府上的藏书，圣武十九年景王因事获罪流放客州死于途中，府第被查抄后多数藏书流入大正宫。左原孙当年是景王府首席幕僚，素有军中智囊之称，因事景王曾被收监三年，朝廷多方招纳而不得，后来其人便不知所踪了。
左原孙垂眸看了看那二十八星宿周天解，面色微动：“多年前一时兴起之作，不想王妃竟知道。”
卿尘命人将菜肴移开，取了几道象牙银箸，一箸代表一千精兵，在桌上将阵法列出：“我对那阵法很是佩服，但有些许不明之处，还请先生不吝赐教。”
南宫竞等人都是带兵的武将，于阵法多有研究，一同围上来看。
左原孙短暂的惊讶过后，依旧气定神闲，一袭长衫衬着鬓角略见的几丝白发，周身沉淀着闲淡的自信，立在桌旁说道：“王妃请说。”抬手将几支银箸挪动了位置。
卿尘见他移阵，凝神看去，稍会儿叹道：“左先生这三支银箸，将我要问的弥补了。”
“哦？”左原孙不禁看了她一眼：“王妃先前可是要问那阵法几处破解？”
“正是。”卿尘道：“先前那阵法虽精妙，但却有几点死处可破，而如今想要破阵怕需费周折才行。”
说话间将几只嵌金的象牙箸取在手中，看似随意的摆放下去。
左原孙不语，手指拨动原先的银箸，阵法忽变。卿尘眉梢轻动，立刻撤了两箸。
左原孙道声：“妙！”手下再动，银箸围成的圆阵忽然开裂，形如鹤翼。卿尘却不以为惑，诱敌之计，若按鹤翼阵去破说不得便全军覆没了。
金箸兵马紧合，成八卦状而列，却暗藏机锋。左原孙微微点头，阵归浑圆，立时将卿尘困在其中。
卿尘稍思片刻，以不变应万变稳稳周旋，几合之下，却有两路兵马忽往左原孙阵中巽门杀去。此处正是左原孙阵中帅位隐在，他嘴角一挑，合阵而成锋锐之势，众人只看得眼花缭乱心驰神摇，似乎这小小木桌化为纵横沙场，陈兵列马刀光剑影，端得是惊心动魄。
如此不知过了多久，卿尘突然以箸点桌，笑道：“呵呵，不行，以此兵力只能自保，要破阵尚难，我认输了！”
左原孙抬头，语中透出些感慨：“王妃将在下逼的甚苦！”
卿尘摇头：“是左先生承让，战场之中敌人岂会待我这般思量布阵？”
左原孙看着那满桌筷箸：“这阵法在下钻研了数年不止，王妃却以未带兵之身处处克敌，毫发不伤，在下佩服。”
卿尘露出个潜静的微笑：“先生这阵势既来自二十八星宿周天解，待我请莫先生开解了几个星相上的问题，再请教先生高明。”
左原孙呵呵一笑，笑中亦带着几分爽朗，隐约透出当年戎马驰骋的豪情。夏步锋此时方从阵中回神过来，叹道：“不想一道算术也能化成如此阵势，今日当真见识神奇！”
“天数之中自与物合，夏将军可知这道大衍求一？的算题中也藏着点兵的学问？”卿尘笑问道。
“愿闻其详！”
“大衍求一？：今有物不知其数，三三数之剩二，五五数之剩三，七七数之剩二，问物几何？”卿尘将算题重复，随即铺纸润墨，笔走龙蛇，边写边道：“三岁孩儿七十稀，五留廿一事尤奇，七度上元重相会，寒食清明便可知。依此解算口诀，点兵之时，若兵卒以三三、五五、七七的阵势排列，默察阵势便可反推兵员总数，瞬间既知。”
杜君述不懂兵法，只看字赞了一声：“不想王妃写的一手好行书。若再锋峻些，竟和四殿下的如出一辙。”
卿尘笑搁了笔：“这字当初便是随他学来的。”一边将那点兵之道细细说于夏步锋等人听。
道理听起来简单，但用起来却难之又难，必要有出神入化的心算才行，几人之中反是不带兵却精通算术的斯惟云反复一推便得心应手。
过得稍会儿，南宫竞亦入其门径，演示几遍后，兴奋说道：“果然奇妙，兵贵神速，这点兵的法子甚是有效，当要好好研究才是！”
“南宫什么事大呼小叫的？”话音方落，门厅处传来夜天凌沉稳的声音。众人自一处抬起头来，才知看的专注，竟连夜天凌来了也不知道。
倒是冥魇原本望着外面出神，第一个看见夜天凌进来，先叫了声“四殿下”。夜天凌点头，眼底似洒了片清泠天星，微微一抬，那星光便尽数落在了卿尘身畔，嘴角笑意轻荡。
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