diff --git a/composer.lock b/composer.lock
index 812475f7..39dd67d8 100644
--- a/composer.lock
+++ b/composer.lock
@@ -621,11 +621,11 @@
         },
         {
             "name": "chesslablab/php-chess",
-            "version": "1.4.93",
+            "version": "1.4.95",
             "source": {
                 "type": "git",
                 "url": "https://github.com/chesslablab/php-chess.git",
-                "reference": "688496ce81a70d5ed607ac07652df4b5c47a2215"
+                "reference": "d4070f2dbbd27e2904ca3029ddba42cb200dec4a"
             },
             "require": {
                 "imagine/imagine": "^1.2",
@@ -682,7 +682,7 @@
                 "validate",
                 "validator"
             ],
-            "time": "2025-01-04T15:20:18+00:00"
+            "time": "2025-01-09T17:47:06+00:00"
         },
         {
             "name": "evenement/evenement",
@@ -5687,12 +5687,12 @@
     ],
     "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": [],
+    "stability-flags": {},
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
         "php": ">=8.1"
     },
-    "platform-dev": [],
+    "platform-dev": {},
     "plugin-api-version": "2.6.0"
 }
diff --git a/src/Command/Game/Async/ExtractCommand.php b/src/Command/Game/Async/ExtractCommand.php
new file mode 100644
index 00000000..16c320bb
--- /dev/null
+++ b/src/Command/Game/Async/ExtractCommand.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace ChessServer\Command\Game\Async;
+
+use ChessServer\Command\AbstractAsyncCommand;
+use ChessServer\Socket\AbstractSocket;
+
+class ExtractCommand extends AbstractAsyncCommand
+{
+    public function __construct()
+    {
+        $this->name = '/extract';
+        $this->description = 'Extracts oscillations data from a game.';
+        $this->params = [
+            'params' => '<string>',
+        ];
+    }
+
+    public function validate(array $argv)
+    {
+        return count($argv) - 1 === count($this->params);
+    }
+
+    public function run(AbstractSocket $socket, array $argv, int $id)
+    {
+        $params = json_decode(stripslashes($argv[1]), true);
+
+        $this->pool->add(new ExtractTask($params))
+            ->then(function ($result) use ($socket, $id) {
+                return $socket->getClientStorage()->send([$id], [
+                    $this->name => $result,
+                ]);
+            });
+    }
+}
diff --git a/src/Command/Game/Async/ExtractTask.php b/src/Command/Game/Async/ExtractTask.php
new file mode 100644
index 00000000..a4043a83
--- /dev/null
+++ b/src/Command/Game/Async/ExtractTask.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace ChessServer\Command\Game\Async;
+
+use Chess\FenToBoardFactory;
+use Chess\SanExtractor;
+use Chess\Function\CompleteFunction;
+use Chess\Variant\Capablanca\Board as CapablancaBoard;
+use Chess\Variant\CapablancaFischer\Board as CapablancaFischerBoard;
+use Chess\Variant\Chess960\Board as Chess960Board;
+use Chess\Variant\Classical\Board as ClassicalBoard;
+use ChessServer\Command\AbstractAsyncTask;
+
+class ExtractTask extends AbstractAsyncTask
+{
+    public function run()
+    {
+        $f = new CompleteFunction();
+        
+        if ($this->params['variant'] === Chess960Board::VARIANT) {
+            $startPos = str_split($this->params['startPos']);
+            $board = isset($this->params['fen'])
+                ? FenToBoardFactory::create($this->params['fen'], new Chess960Board($startPos))
+                : new Chess960Board($startPos);
+        } elseif ($this->params['variant'] === CapablancaBoard::VARIANT) {
+            $board = isset($this->params['fen'])
+                ? FenToBoardFactory::create($this->params['fen'], new CapablancaBoard())
+                : new CapablancaBoard();
+        } elseif ($this->params['variant'] === CapablancaFischerBoard::VARIANT) {
+            $startPos = str_split($this->params['startPos']);
+            $board = isset($this->params['fen'])
+                ? FenToBoardFactory::create($this->params['fen'], new CapablancaFischerBoard($startPos))
+                : new CapablancaFischerBoard($startPos);
+        } elseif ($this->params['variant'] === ClassicalBoard::VARIANT) {
+            $board = isset($this->params['fen'])
+                ? FenToBoardFactory::create($this->params['fen'], new ClassicalBoard())
+                : new ClassicalBoard();
+        }
+
+        return [
+            'steinitz' => SanExtractor::steinitz($f, $board->clone(), $this->params['movetext']),
+            'mean' => SanExtractor::mean($f, $board->clone(), $this->params['movetext']),
+            'sd' => SanExtractor::sd($f, $board->clone(), $this->params['movetext']),
+        ];
+    }
+}
diff --git a/src/Command/Game/Cli.php b/src/Command/Game/Cli.php
index 133964af..5ff591ce 100644
--- a/src/Command/Game/Cli.php
+++ b/src/Command/Game/Cli.php
@@ -3,6 +3,7 @@
 namespace ChessServer\Command\Game;
 
 use ChessServer\Command\AbstractCli;
+use ChessServer\Command\Game\Async\ExtractCommand;
 use ChessServer\Command\Game\Async\HeuristicCommand;
 use ChessServer\Command\Game\Async\LeaveCommand;
 use ChessServer\Command\Game\Async\PlayCommand;
@@ -43,6 +44,7 @@ public function __construct(Pool $pool)
         $this->commands->attach(new TakebackCommand());
         // param-based commands
         $this->commands->attach(new AcceptPlayRequestCommand());
+        $this->commands->attach((new ExtractCommand())->setPool($pool));
         $this->commands->attach((new HeuristicCommand())->setPool($pool));
         $this->commands->attach((new LeaveCommand())->setPool($pool));
         $this->commands->attach(new LegalCommand());