diff --git a/fsharp/ygosim/src/Board.fs b/fsharp/ygosim/src/Board.fs
index 64aa8f4..69e349e 100644
--- a/fsharp/ygosim/src/Board.fs
+++ b/fsharp/ygosim/src/Board.fs
@@ -1,8 +1,42 @@
 module Board
 
-open Player
+module Side =
+    open Card
 
-type Board =
-    { players: Player * Player }
+    type Side =
+        { field: Card option
+          monsters: Card list
+          spells: Card list
+          graveyard: Card list
+          deck: Card list }
 
-let emptyBoard = { players = (initialPlayer 8000, initialPlayer 8000) }
+    let emptySide =
+        { field = None
+          monsters = []
+          spells = []
+          graveyard = []
+          deck = [] }
+
+
+module Player =
+    open Side
+
+    type Player =
+        { lifePoints: int
+          side: Side }
+
+    let inflictDamage (player: Player) amount = { player with lifePoints = player.lifePoints - amount }
+
+    let initialPlayer lp =
+        { lifePoints = lp
+          side = emptySide }
+
+
+
+module Board =
+    open Player
+
+    type Board =
+        { players: Player * Player }
+
+    let emptyBoard = { players = (initialPlayer 8000, initialPlayer 8000) }
diff --git a/fsharp/ygosim/src/Player.fs b/fsharp/ygosim/src/Player.fs
deleted file mode 100644
index 7ed00f5..0000000
--- a/fsharp/ygosim/src/Player.fs
+++ /dev/null
@@ -1,13 +0,0 @@
-module Player
-
-open Side
-
-type Player =
-    { lifePoints: int
-      side: Side }
-
-let inflictDamage (player: Player) amount = { player with lifePoints = player.lifePoints - amount }
-
-let initialPlayer lp =
-    { lifePoints = lp
-      side = emptySide }
diff --git a/fsharp/ygosim/src/Side.fs b/fsharp/ygosim/src/Side.fs
deleted file mode 100644
index 493852c..0000000
--- a/fsharp/ygosim/src/Side.fs
+++ /dev/null
@@ -1,17 +0,0 @@
-module Side
-
-open Card
-
-type Side =
-    { field: Card option
-      monsters: Card list
-      spells: Card list
-      graveyard: Card list
-      deck: Card list }
-
-let emptySide =
-    { field = None
-      monsters = []
-      spells = []
-      graveyard = []
-      deck = [] }
diff --git a/fsharp/ygosim/ygosim.fsproj b/fsharp/ygosim/ygosim.fsproj
index f2badb6..607de4c 100644
--- a/fsharp/ygosim/ygosim.fsproj
+++ b/fsharp/ygosim/ygosim.fsproj
@@ -7,8 +7,6 @@
 
   <ItemGroup>
     <Compile Include="src/Card.fs" />
-    <Compile Include="src/Side.fs" />
-    <Compile Include="src/Player.fs" />
     <Compile Include="src/Board.fs" />
     <Compile Include="src/Program.fs" />
   </ItemGroup>