diff --git a/app/routes.php b/app/routes.php
index 01d604b..4f5605b 100644
--- a/app/routes.php
+++ b/app/routes.php
@@ -4,7 +4,6 @@
 
 use Chess\Heuristics\EvalFunction;
 use Chess\Heuristics\SanHeuristics;
-use Chess\Variant\Classical\Board as ClassicalBoard;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Slim\App;
 use Slim\Http\Response as Response;
@@ -31,10 +30,8 @@
 
         // TODO: Parameter validation
 
-        $board = new ClassicalBoard();
-
         $evalFunction = new EvalFunction();
-        $heuristics = new SanHeuristics($params['movetext'], $board);
+        $heuristics = new SanHeuristics($params['movetext']);
 
         $json = [
             'evalNames' => $evalFunction->names(),
diff --git a/public/main.js b/public/main.js
index 8c34695..32dd6c2 100644
--- a/public/main.js
+++ b/public/main.js
@@ -1,7 +1,22 @@
 const gameForm = document.getElementById('gameForm');
 
-gameForm.querySelector('button').onclick = (event) => {
-  // TODO: Send the data to the /api/heuristics endpoint
-  console.log(gameForm.querySelector('textarea').value);
+gameForm.querySelector('button').onclick = async (event) => {
   event.preventDefault();
+  await fetch(`http://localhost:8080/api/heuristics`, {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json',
+    },
+    body: JSON.stringify({
+      movetext: gameForm.querySelector('textarea').value
+    })
+  })
+  .then(res => res.json())
+  .then(res => {
+    // TODO
+    console.log(res);
+  })
+  .catch(error => {
+    alert('Whoops! Something went wrong, please try again.');
+  });
 }