diff --git a/2013/4-knockout/players.ini b/2013/4-knockout/players.ini
new file mode 100644
index 0000000..905ca02
--- /dev/null
+++ b/2013/4-knockout/players.ini
@@ -0,0 +1,69 @@
+[player1]
+name    = redgremlin
+lichess = gremlin_the_red
+elo     = 1853
+
+[player2]
+name    = Magian
+lichess = Magian
+elo     = 1939
+
+[player3]
+name    = iVS
+lichess = iVS
+elo     = 1929
+
+[player4]
+name    = HunOL
+lichess = HunOL
+elo     = 1832
+
+[player5]
+name    = Nedis
+lichess = Nedis
+elo     = 1737
+
+[player6]
+name    = aptyp
+lichess = aptypr
+elo     = 1713
+
+[player7]
+name    = Michkova
+lichess = Michkova
+elo     = 1696
+
+[player8]
+name    = MyTrooName
+lichess = sshilovsky
+elo     = 1627
+
+[player9]
+name    = Nokman
+lichess = Nokman
+elo     = 1576
+
+[player10]
+name    = DoctorSinus
+lichess = fat0troll
+elo     = 1328
+
+[player11]
+name    = shell-script
+lichess = cppmm
+elo     = 1321
+
+[player12]
+name    = trex6
+lichess = txgames
+elo     = 1350
+
+[player13]
+name    = Zodd
+lichess = zodd
+elo     = 1805
+
+[player14]
+name    = nanonymous
+lichess = n_lor
+elo     = 1433
diff --git a/2013/4-knockout/players.yml b/2013/4-knockout/players.yml
deleted file mode 100644
index 54cf08f..0000000
--- a/2013/4-knockout/players.yml
+++ /dev/null
@@ -1,55 +0,0 @@
-- number:  1
-  lor:     redgremlin
-  lichess: gremlin_the_red
-
-- number:  2
-  lor:     Magian
-  lichess: Magian
-
-- number:  3
-  lor:     iVS
-  lichess: iVS
-
-- number:  4
-  lor:     HunOL
-  lichess: HunOL
-
-- number:  5
-  lor:     Nedis
-  lichess: Nedis
-
-- number:  6
-  lor:     aptyp
-  lichess: aptypr
-
-- number:  7
-  lor:     Michkova
-  lichess: Michkova
-
-- number:  8
-  lor:     MyTrooName
-  lichess: sshilovsky
-
-- number:  9
-  lor:     Nokman
-  lichess: Nokman
-
-- number:  10
-  lor:     DoctorSinus
-  lichess: fat0troll
-
-- number:  11
-  lor:     shell-script
-  lichess: cppmm
-
-- number:  12
-  lor:     trex6
-  lichess: txgames
-
-- number:  13
-  lor:     Zodd
-  lichess: zodd
-
-- number:  14
-  lor:     nanonymous
-  lichess: n_lor