Momentum & Readiness
夫兵之四备：曰阵、曰势、曰变、曰权。
The four essentials of warfare: formation, momentum, flexibility, and authority.
夫兵之四备：曰阵、曰势、曰变、曰权。四者俱备，而后可以破敌决胜。
因其势、利其地、激其气、权其变，以寡击众，以弱制强。
用兵的四大要素：阵形、态势、变化、权衡。四者兼备，才能破敌制胜。利用态势、借助地形、激励士气、掌控变化，就能以少胜多、以弱胜强。
The four essentials of warfare: formation, momentum, flexibility, and authority. Only when all four are complete can you defeat the enemy. Use momentum, take advantage of terrain, inspire morale, control changes — defeat the many with the few.
阵、势、变、权为兵之四备；造势、用地、激气、权变，是以弱胜强的关键
Formation, momentum, flexibility, authority — four essentials for victory.
"四备"理论是孙膑对孙子"势篇"的重要发展。将"阵、势、变、权"四者并列，形成一个完整的战斗力生成模型：阵是结构、势是能量、变是适应、权是决策。
Compare to Napoleon's "Coup d'œil" (military glance) — rapid assessment. Compare to agile methodology's four values.
谢玄利用前秦军心不稳（势）、淝水地形（阵）、诱敌渡河（变）、果断出击（权），以少胜多。
Xie Xian exploited the Former Qin's unstable morale (momentum), the Feishui terrain (formation), a ruse to lure them across (flexibility), and decisive strikes (authority) to win against superior numbers.
以色列空军先发制人摧毁埃及空军，掌握制空权后快速推进，六天击败三国联军。
Israel's air force launched a preemptive strike destroying Egypt's air force, then advanced rapidly with air superiority, defeating a three-nation coalition in six days.
联军以空中优势造势，地面战仅100小时即结束，展现了现代四备理论的威力。
The coalition built momentum with air superiority; the ground war ended in just 100 hours, demonstrating the power of the four essentials in modern warfare.