Here is Sengoku BASARA X system.
-buttons-
A:attack(L)
B:attack(M)
C:attack(H)
Reinforce:Reinforce (in japanese "援軍" )
button map is different by author in MUGEN.
-System-
Chaincombo: A>B>C
Throw: 4C or 6C
Overhead-attack: 6B
Aerial combo start: 2B+C
Aerial spike : (in Aerial combo) 2C
Blow attack : B+C
Guard cancel : (in guard) 6B+C
Perfect guard :4A+B
-other-
All character has "BASARA waza(BASARA技)", this is same as Hyper combo. These command is 236236+C and 214214+C.
And all character has " Ichigeki Basara waza(一撃BASARA技)" too, "Ichigeki(一撃)" means one hit KO.
When there is flashing "Ichigeki(一撃)" icon next to Reinforce icon, press A+B+C to "Preparation Ichigeki BASARA waza(一撃BASARA技発動準備)".
In preparation Ichigeki BASARA waza, can use Ichigeki BASARA waza.(command: 2141236+C)
If fail to hit Ichigeki BASARA waza , lose all BASARA gauge and Ichigeki gauge as penalty.
summarizing the above,
when flashing Ichigeki(一撃) icon,press A+B+C(preparation Ichigeki BASARA waza) -> 2141236+C: Ichigeki BASARA waza.
This is all !