diff --git a/swad_changelog.h b/swad_changelog.h
index 1168bc9e7..92f5162fa 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -61,7 +61,6 @@
 /*********************************** TODO ************************************/
 /*****************************************************************************/
 
-// TODO: Víctor Cabrita Gómez, 2019-02-27: "Para cuando un tema oscuro de SWAD?"
 // TODO: Is it necessary FileType in table "files"?
 // TODO: When notifications are marked as seen, do it in a priori function
 // TODO: Use the library http://fukuchi.org/works/qrencode/index.html.en instead Google QR
@@ -606,10 +605,11 @@ TODO: Fix bug: error al enviar un mensaje a dos recipientes, error on duplicate
 
 TODO: Attach pdf files in multimedia.
 */
-#define Log_PLATFORM_VERSION	"SWAD 22.50.2 (2022-10-19)"
+#define Log_PLATFORM_VERSION	"SWAD 22.50.3 (2022-10-19)"
 #define CSS_FILE		"swad22.49.4.css"
 #define JS_FILE			"swad22.49.js"
 /*
+	Version 22.50.3:  Oct 19, 2022  Fixed bug in keys when playing matches. (333456 lines)
 	Version 22.50.2:  Oct 19, 2022  Code refactoring related to dates. (333456 lines)
 	Version 22.50.1:  Oct 19, 2022  Code refactoring related to dates. (333332 lines)
 	Version 22.50:    Oct 19, 2022  Code refactoring related to dates. (333318 lines)
diff --git a/swad_match.c b/swad_match.c
index a066ba85b..398ddb778 100644
--- a/swad_match.c
+++ b/swad_match.c
@@ -205,7 +205,7 @@ static const char *Mch_GetClassBorder (unsigned NumRow);
 static void Mch_PutParamNumOpt (unsigned NumOpt);
 static unsigned Mch_GetParamNumOpt (void);
 
-static void Mch_PutBigButton (Act_Action_t NextAction,
+static void Mch_PutBigButton (Act_Action_t NextAction,const char *Id,
 			      long MchCod,const char *Icon,const char *Txt);
 static void Mch_PutBigButtonHidden (const char *Icon);
 static void Mch_PutBigButtonClose (void);
@@ -2539,7 +2539,7 @@ static void Mch_PutMatchControlButtons (const struct Mch_Match *Match)
 	       break;
 	    default:
 	       /* Put button to go back */
-	       Mch_PutBigButton (ActBckMch,Match->MchCod,
+	       Mch_PutBigButton (ActBckMch,"backward",Match->MchCod,
 				 Mch_ICON_PREVIOUS,Txt_Go_back);
 	       break;
 	   }
@@ -2549,7 +2549,7 @@ static void Mch_PutMatchControlButtons (const struct Mch_Match *Match)
       HTM_DIV_Begin ("class=\"MCH_BUTTON_CENTER_CONT\"");
 	 if (Match->Status.Playing)					// Match is being played
 	    /* Put button to pause match */
-	    Mch_PutBigButton (ActPlyPauMch,Match->MchCod,
+	    Mch_PutBigButton (ActPlyPauMch,"play_pause",Match->MchCod,
 			      Mch_ICON_PAUSE,Txt_Pause);
 	 else								// Match is paused, not being played
 	   {
@@ -2557,7 +2557,7 @@ static void Mch_PutMatchControlButtons (const struct Mch_Match *Match)
 	      {
 	       case Mch_START:	// Match just started, before first question
 		  /* Put button to start playing match */
-		  Mch_PutBigButton (ActPlyPauMch,Match->MchCod,
+		  Mch_PutBigButton (ActPlyPauMch,"play_pause",Match->MchCod,
 				    Mch_ICON_PLAY,Txt_Start);
 		  break;
 	       case Mch_END:	// Match over
@@ -2566,7 +2566,7 @@ static void Mch_PutMatchControlButtons (const struct Mch_Match *Match)
 		  break;
 	       default:
 		  /* Put button to resume match */
-		  Mch_PutBigButton (ActPlyPauMch,Match->MchCod,
+		  Mch_PutBigButton (ActPlyPauMch,"play_pause",Match->MchCod,
 				    Mch_ICON_PLAY,Txt_Resume);
 	      }
 	   }
@@ -2579,7 +2579,7 @@ static void Mch_PutMatchControlButtons (const struct Mch_Match *Match)
 	    Mch_PutBigButtonClose ();
 	 else						// Match not over
 	    /* Put button to show answers */
-	    Mch_PutBigButton (ActFwdMch,Match->MchCod,
+	    Mch_PutBigButton (ActFwdMch,"forward",Match->MchCod,
 			      Mch_ICON_NEXT,Txt_Go_forward);
       HTM_DIV_End ();
 
@@ -3264,11 +3264,11 @@ static unsigned Mch_GetParamNumOpt (void)
 /*********************** Put a big button to do action ***********************/
 /*****************************************************************************/
 
-static void Mch_PutBigButton (Act_Action_t NextAction,
+static void Mch_PutBigButton (Act_Action_t NextAction,const char *Id,
 			      long MchCod,const char *Icon,const char *Txt)
   {
    /***** Begin form *****/
-   Frm_BeginForm (NextAction);
+   Frm_BeginFormId (NextAction,Id);
       Mch_PutParamMchCod (MchCod);
 
       /***** Put icon with link *****/