diff --git a/README.md b/README.md
index e3905fb..bdb641d 100644
--- a/README.md
+++ b/README.md
@@ -94,7 +94,7 @@ The `trainer` block has the following options to tweak:
 * `balance_play_min_eval`: when needing to balance score, the AI will pick a move which is at least this good.
 * `balance_play_min_visits`: never pick a move with fewer playouts than this.
 * `undo_eval_threshold`, `undo_point_threshold`: prompt player to undo if move is worse than this in terms of points AND evaluation.
-* `num_undo_prompts`: automatically undo bad moves when `undo` is on at most this many times.
+* `num_undo_prompts`: automatically undo bad moves when `undo` is on at most this many times. Can be a fraction like 0.5 for 50% chance of being granted an undo on a bad move.
 
 The cfg file has additional configuration for kata. In particular, it changes the default to being more exploratory and score-based (and therefore nicer as an opponent, but weaker as analysis tool).
 
diff --git a/board.py b/board.py
index 9cba08f..618c326 100644
--- a/board.py
+++ b/board.py
@@ -259,6 +259,8 @@ class Board:
 
     # Play a Move from the current position, raise IllegalMoveException if invalid.
     def play(self, move, ignore_ko=False):
+        if not move.is_pass and not (0 <= move.coords[0] < self.board_size and 0 <= move.coords[1] < self.board_size):
+            raise IllegalMoveException(f"Move {move} outside of board coordinates")
         played_move = self.current_move.play(move)
         try:
             self._validate_move_and_update_chains(played_move, ignore_ko)
diff --git a/controller.py b/controller.py
index 0ffeafe..b5360b0 100644
--- a/controller.py
+++ b/controller.py
@@ -201,6 +201,17 @@ class EngineControls(GridLayout):
         for el in [self.ai_lock.checkbox, self.hints.black, self.hints.white, self.ai_auto.black, self.ai_auto.white, self.auto_undo.black, self.auto_undo.white, self.ai_move]:
             el.disabled = False
 
+    def universal_read(self, file):
+        with open(file, "rb") as f:
+            bin_c = f.read()
+        for encoding in ["utf-8", "iso-8859-1", "cp949", "GB18030"]:
+            try:
+                return bin_c.decode(encoding=encoding)
+            except:
+                pass
+        self.info.text = f"could not decode file contents of {file}"
+        return ""
+
     def _do_analyze_sgf(self, sgf, faster=False, rewind=False):
         sgfprops = {k: v for k, v in re.findall(r"\b(\w+)\[(.*?)\]", sgf)}
         size = int(sgfprops.get("SZ", self.board_size))
@@ -220,8 +231,7 @@ class EngineControls(GridLayout):
 
             def readfile(files, mouse):
                 fileselect_popup.dismiss()
-                with open(files[0]) as f:
-                    self.action("analyze-sgf", f.read(), cbfast.active, cbrewind.active)
+                self.action("analyze-sgf", self.universal_read((files[0])), cbfast.active, cbrewind.active)
 
             fc.on_submit = readfile
             fileselect_popup.open()