diff --git a/engine.py b/engine.py
index 55f9211..4929ada 100644
--- a/engine.py
+++ b/engine.py
@@ -34,6 +34,33 @@ class Event(TPrs):
             if ev in tok.mpevDgoob and tok.mpevDgoob[ev](value):
                 raise Event.OobBreakException()
 
+    @classmethod
+    def select(cls, tok, *rgev):
+        for ev in rgev:
+            ev.rgtk.append(tok)
+        chNotify = tok.chEv
+        fOob = False
+        while True:
+            evRcv, value = chNotify.receive()
+            if evRcv in tok.mpevDgoob:
+                if tok.mpevDgoob[ev](value):
+                    fOob = True
+                    break
+            else:
+                break
+        for ev in rgev:
+            if ev != evRcv:
+                ev.rgtk.remove(tok)
+        if fOob:
+            raise Event.OobBreakException()
+        return evRcv, value
+
+    @classmethod
+    def selectDg(cls, tok, *rgev_dg):
+        rgev, rgdg = zip(*rgev_dg)
+        ev, value = cls.select(tok, *rgev)
+        rgdg[rgev.index(ev)](value)
+        
     def fire(self, value = None):
         self.stkValue.append(value)
         self.game.queueEv.append(self)