diff --git a/pos.py b/pos.py
new file mode 100644
index 0000000..a82f2e8
--- /dev/null
+++ b/pos.py
@@ -0,0 +1,52 @@
+# position implementation
+
+class TwoDUtils:
+    mappings = {
+            'a': 0,
+            'b': 1,
+            'c': 2,
+            'd': 3,
+            'e': 4,
+            'f': 5,
+            'g': 6,
+            'h': 7,
+            'i': 8,
+    }
+    reverse = {i[1]:i[0] for i in mappings.items()}
+    def __init__(self):
+        pass
+
+class TwoDPos:
+    g = 0
+    l = 1
+    def __init__(self, mode, param):
+        if mode == TwoDPos.g:
+            self.pos = (
+                    TwoDUtils.mappings[param[0]],
+                    int(param[1]) - 1,
+            )
+        elif mode == TwoDPos.l:
+            self.pos = (
+                    param[0] * 3 + param[2],
+                    param[1] * 3 + param[3] + 1,
+            )
+
+    def glob(self):
+        ret = []
+        ret.append(TwoDUtils.reverse[self.pos[0]])
+        ret.append(str(self.pos[1] + 1))
+
+        return ''.join(ret)
+
+    def local(self):
+        subboard = (
+                int(self.pos[0] / 3),
+                int(self.pos[1] / 3),
+        )
+
+        localpos = (
+                self.pos[0] % 3,
+                self.pos[1] % 3,
+        )
+
+        return (subboard[0], subboard[1], localpos[0], localpos[1])