How is luck calculated

Is it from your dice roll? Idk how this following game turned out to have 34.8% luck, I never won anything.

waldov's turn
Austin89 defeated 5v4, 16 to 12, (1,1,4,5,5 to 4,1,4,3)
+4 dice
Josh =)'s turn
Austin89 defeated 4v2, 14 to 8, (4,5,4,1 to 3,5)
+6 dice
Austin89's turn
gen. sherman defended 2v2, 4 to 10, (2,2 to 4,6)
+1 dice
Petercules's turn
Austin89 defeated 5v4, 21 to 12, (4,4,2,6,5 to 4,4,2,2)
+4 dice
Austin89's turn
+1 dice
Austin89's turn
gen. sherman defended 3v3, 7 to 16, (1,5,1 to 6,4,6)
(-100 for 7th and +0 for dominance)
Rank: 1174th Score: -100 to 701◆.