FightUK.com

"The very best Janissaries were sent on to the Sultan's palace, where they would form his elite bodyguard"
----------------------------------------

This practice has a Psychology
that allows for individual freeform and technique
Systema (using a broad stroke) is a generic term used to cover several disciplines of practice because they all have similarities at the philosophical core. Spetsnaz/KGB/FSB/OSNAZ/OMON Psychological training concentration, emotional manipulation and the psychological manipulation of the influence on a person's conscience.
This is mainly the hand to hand fighting system taught to the highly respected and deadly special elite Soviet groups
---------------------------------------
(Janissaries-Balkan-born Christian Boys Forced/slaves to Become
Islam's Most Elite Soldiers)

Balkan - By 1389 when the Serbs fell to the ottoman empire the Sultan ordered a tax to be paid by every Christian family -- a son. The sons that would go on to form the elite unit known as the "Janissaries." "Yes, it is the Muslims, not the white Europeans who were the first and greatest slave traders.
---------------------------------------- -

Once the Janissaries had recovered from their long trek from the Balkans, they were put under both mental and physical tests by the Turks. They were trained for eight years in archery, swordsmanship, horsemanship, wrestling and weightlifting. Some would go on to work on the estates of Turkish nobles as farmhands. Others learned skills like blacksmithing, masonry and carpentry. The very best Janissaries were sent on to the Sultan's palace, where they would form his elite bodyguard.