diff --git a/tinybrain/src/err.rs b/tinybrain/src/err.rs
new file mode 100644
index 000000000..6032f899b
--- /dev/null
+++ b/tinybrain/src/err.rs
@@ -0,0 +1,20 @@
+use serde_derive::{Deserialize, Serialize};
+#[derive(Debug, Copy, Clone, Serialize, Deserialize)]
+pub struct CoordOutOfRange;
+
+impl From<std::num::ParseIntError> for CoordOutOfRange {
+    fn from(_: std::num::ParseIntError) -> Self {
+        CoordOutOfRange
+    }
+}
+
+#[derive(Debug)]
+pub enum KataGoParseErr {
+    UuidErr(uuid::Error),
+    WrongFormat,
+}
+impl From<uuid::Error> for KataGoParseErr {
+    fn from(u: uuid::Error) -> Self {
+        KataGoParseErr::UuidErr(u)
+    }
+}
diff --git a/tinybrain/src/lib.rs b/tinybrain/src/lib.rs
index 2680edd24..32dcacb64 100644
--- a/tinybrain/src/lib.rs
+++ b/tinybrain/src/lib.rs
@@ -12,6 +12,7 @@ extern crate http;
 
 mod authorization;
 pub mod env;
+mod err;
 pub mod katago;
 pub mod websocket;
 
@@ -29,7 +30,7 @@ pub struct ComputeMove {
 pub struct MoveComputed(MakeMoveCommand);
 
 impl MoveComputed {
-    pub fn from(response: KataGoResponse) -> Result<Self, katago::json::KataGoParseErr> {
+    pub fn from(response: KataGoResponse) -> Result<Self, err::KataGoParseErr> {
         let game_id = response.game_id()?;
         let player = response.player()?;
         let coord: Option<Coord> = todo!("figure out the reverse conversion");
@@ -43,6 +44,23 @@ impl MoveComputed {
     }
 }
 
+fn from_alphanum(a: &str) -> Result<Coord, err::CoordOutOfRange> {
+    if a.len() < 2 {
+        Err(err::CoordOutOfRange)
+    } else {
+        let letter: char = a.chars().collect::<Vec<char>>()[0];
+        let number = &a[1..];
+        let y_plus_one = number.to_string().parse::<u16>()?;
+        let r = (b'A'..=b'Z');
+        todo!();
+
+        Ok(Coord {
+            x: todo!(),
+            y: y_plus_one - 1,
+        })
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;