diff --git a/CHANGES.md b/CHANGES.md
index 2bc395b..2335f98 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,7 +1,9 @@
 Changes in version 2017-06-19 (20170619)
-- Fix Moodle 3.4 compatibility problems
-- Fix codeprechecks problems
-- Stable version
+- Change field name game_snakes_database.cols => usedcols
+- Change field name game_snakes_database.rows => usedrows
+
+Changes in version 2017-06-10 (20170610)
+- Fix phpdocs problems
 
 Changes in version 2017-06-09 (20170609)
 - Fix Moodle 3.4 compatibility problems
diff --git a/db/install.xml b/db/install.xml
index b64bd27..a17e49e 100755
--- a/db/install.xml
+++ b/db/install.xml
@@ -287,8 +287,8 @@
       <FIELDS>
         <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
         <FIELD NAME="name" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false"/>
-        <FIELD NAME="cols" TYPE="int" LENGTH="3" NOTNULL="false" SEQUENCE="false"/>
-        <FIELD NAME="rows" TYPE="int" LENGTH="3" NOTNULL="false" SEQUENCE="false"/>
+        <FIELD NAME="usedcols" TYPE="int" LENGTH="3" NOTNULL="false" SEQUENCE="false"/>
+        <FIELD NAME="usedrows" TYPE="int" LENGTH="3" NOTNULL="false" SEQUENCE="false"/>
         <FIELD NAME="data" TYPE="text" NOTNULL="false" SEQUENCE="false"/>
         <FIELD NAME="fileboard" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false"/>
         <FIELD NAME="direction" TYPE="int" LENGTH="2" NOTNULL="false" SEQUENCE="false"/>
diff --git a/db/upgrade.php b/db/upgrade.php
index 12dd2d1..9b6bf60 100644
--- a/db/upgrade.php
+++ b/db/upgrade.php
@@ -1556,6 +1556,23 @@ function xmldb_game_upgrade($oldversion) {
         $dbman->change_field_type($table, $field);
     }
 
+    if ($oldversion < ($ver = 2017061604)) {
+        $table = new xmldb_table('game_cross');
+        $field = new xmldb_field('usedrows', XMLDB_TYPE_INTEGER, '3', XMLDB_UNSIGNED, null, null, '0', 'id');
+        if (!$dbman->field_exists($table, $field)) {
+            $dbman->add_field($table, $field);
+        }
+
+        $field = new xmldb_field('rows', XMLDB_TYPE_INTEGER, '3', XMLDB_UNSIGNED, null, null, '0', 'id');
+        if ($dbman->field_exists($table, $field)) {
+            $sql = "UPDATE {$CFG->prefix}game_cross SET usedrows=rows";
+            $DB->execute( $sql);
+            $dbman->drop_field($table, $field);
+        } else {
+            $dbman->add_field($table, $field);
+        }
+    }
+
     if ($oldversion < ($ver = 2017061604)) {
         $table = new xmldb_table('game_cross');
         $field = new xmldb_field('usedcols', XMLDB_TYPE_INTEGER, '3', XMLDB_UNSIGNED, null, null, '0', 'id');
@@ -1573,8 +1590,8 @@ function xmldb_game_upgrade($oldversion) {
         }
     }
 
-    if ($oldversion < ($ver = 2017061604)) {
-        $table = new xmldb_table('game_cross');
+    if ($oldversion < ($ver = 2017061901)) {
+        $table = new xmldb_table('game_snakes_database');
         $field = new xmldb_field('usedrows', XMLDB_TYPE_INTEGER, '3', XMLDB_UNSIGNED, null, null, '0', 'id');
         if (!$dbman->field_exists($table, $field)) {
             $dbman->add_field($table, $field);
@@ -1582,7 +1599,7 @@ function xmldb_game_upgrade($oldversion) {
 
         $field = new xmldb_field('rows', XMLDB_TYPE_INTEGER, '3', XMLDB_UNSIGNED, null, null, '0', 'id');
         if ($dbman->field_exists($table, $field)) {
-            $sql = "UPDATE {$CFG->prefix}game_cross SET usedrows=rows";
+            $sql = "UPDATE {$CFG->prefix}game_snakes_database SET usedrows=rows";
             $DB->execute( $sql);
             $dbman->drop_field($table, $field);
         } else {
@@ -1590,5 +1607,22 @@ function xmldb_game_upgrade($oldversion) {
         }
     }
 
+    if ($oldversion < ($ver = 2017061901)) {
+        $table = new xmldb_table('game_snakes_database');
+        $field = new xmldb_field('usedcols', XMLDB_TYPE_INTEGER, '3', XMLDB_UNSIGNED, null, null, '0', 'id');
+        if (!$dbman->field_exists($table, $field)) {
+            $dbman->add_field($table, $field);
+        }
+
+        $field = new xmldb_field('cols', XMLDB_TYPE_INTEGER, '3', XMLDB_UNSIGNED, null, null, '0', 'id');
+        if ($dbman->field_exists($table, $field)) {
+            $sql = "UPDATE {$CFG->prefix}game_snakes_database SET usedcols=cols";
+            $DB->execute( $sql);
+            $dbman->drop_field($table, $field);
+        } else {
+            $dbman->add_field($table, $field);
+        }
+    }
+ 
     return true;
 }
diff --git a/mod_form.php b/mod_form.php
index 1e43bb6..bdbacf2 100644
--- a/mod_form.php
+++ b/mod_form.php
@@ -508,8 +508,8 @@ class mod_game_mod_form extends moodleform_mod {
                 if ($board != 0) {
                     $rec = $DB->get_record( 'game_snakes_database', array( 'id' => $board));
                     $defaultvalues->snakes_data = $rec->data;
-                    $defaultvalues->snakes_cols = $rec->cols;
-                    $defaultvalues->snakes_rows = $rec->rows;
+                    $defaultvalues->snakes_cols = $rec->usedcols;
+                    $defaultvalues->snakes_rows = $rec->usedrows;
                     $defaultvalues->snakes_headerx = $rec->headerx;
                     $defaultvalues->snakes_headery = $rec->headery;
                     $defaultvalues->snakes_footerx = $rec->footerx;
diff --git a/snakes/play.php b/snakes/play.php
index 911d418..4dd7efe 100644
--- a/snakes/play.php
+++ b/snakes/play.php
@@ -74,7 +74,7 @@ function game_snakes_play( $id, $game, $attempt, $snakes, $context) {
     $board = game_snakes_get_board( $game);
     $showboard = false;
 
-    if ($snakes->position > $board->cols * $board->rows && $snakes->queryid <> 0) {
+    if ($snakes->position > $board->usedcols * $board->usedrows && $snakes->queryid <> 0) {
         $finish = true;
 
         if (! $cm = $DB->get_record('course_modules', array( 'id' => $id))) {
@@ -180,11 +180,11 @@ top:<?php p( -2 * round($board->height / 3));?>px; ">
  * @param stdClass $board
  */
 function game_snakes_computeplayerposition( $snakes, $board) {
-    $x = ($snakes->position - 1) % $board->cols;
-    $y = floor( ($snakes->position - 1) / $board->cols);
+    $x = ($snakes->position - 1) % $board->usedcols;
+    $y = floor( ($snakes->position - 1) / $board->usedcols);
 
-    $cellwidth = ($board->width - $board->headerx - $board->footerx) / $board->cols;
-    $cellheight = ($board->height - $board->headery - $board->footery) / $board->rows;
+    $cellwidth = ($board->width - $board->headerx - $board->footerx) / $board->usedcols;
+    $cellheight = ($board->height - $board->headery - $board->footery) / $board->usedrows;
 
     $pos = new stdClass();
     $pos->width = 22;
@@ -196,7 +196,7 @@ function game_snakes_computeplayerposition( $snakes, $board) {
     switch( $board->direction) {
         case 1:
             if (($y % 2) == 1) {
-                $x = $board->cols - $x - 1;
+                $x = $board->usedcols - $x - 1;
             }
             $pos->x = $board->headerx + $x * $cellwidth + ($cellwidth - $pos->width) / 2 + $pos->ofsx;
             $pos->y = $board->footery + $y * $cellheight + ($cellheight - $pos->height) / 2 + $pos->ofsy;
@@ -488,8 +488,8 @@ function game_snakes_position( $id, $game, $attempt, $snakes, $correct, $query,
     }
 
     $board = $DB->get_record_select( 'game_snakes_database', "id=$snakes->snakesdatabaseid");
-    $gradeattempt = $snakes->position / ($board->cols * $board->rows);
-    $finished = ( $snakes->position > $board->cols * $board->rows ? 1 : 0);
+    $gradeattempt = $snakes->position / ($board->usedcols * $board->usedrows);
+    $finished = ( $snakes->position > $board->usedcols * $board->usedrows ? 1 : 0);
 
     game_updateattempts( $game, $attempt, $gradeattempt, $finished);
 
diff --git a/version.php b/version.php
index a0e1d80..6d0ce40 100644
--- a/version.php
+++ b/version.php
@@ -39,7 +39,7 @@ $plugin->version   = 2017061901;  // The current module version (Date: YYYYMMDDX
 $plugin->requires  = 2010112400;  // Requires Moodle 2.0.
 $plugin->cron      = 0;           // Period for cron to check this module (secs).
 $plugin->release   = '2017-06-19';
-$plugin->maturity = MATURITY_STABLE;
+$plugin->maturity = MATURITY_BETA;
 
 if ($useplugin != 2) {
     $module = $plugin;