fix some rough spots in the drag-and-drop UI

css/chess.css

@@ -148,3 +148,21 @@
 #cb_phantom > .cb-lt-piece {
 	 left: 22.5%;
 }
+
+.noselect {
+	 cursor: default;
+	 -webkit-touch-callout: none;
+	 -webkit-user-select: none;
+	 -khtml-user-select: none;
+	 -moz-user-select: none;
+	 -ms-user-select: none;
+	 user-select: none;
+}
+
+#cb_board .cb-piece.ui-draggable {
+	 cursor: grab;
+}
+
+#cb_board .cb-piece.ui-draggable-disabled {
+	 cursor: default;
+}

index.html

@@ -13,7 +13,7 @@
          <div id="cb_outer">
             <div id="cb_container">
                <div id="cb_inner">
-                  <table id="cb_board">
+                  <table id="cb_board" class="noselect">
                      <tr>
                         <td></td>
                         <td class="cb-horiz-label"><div>A</div></td>
@@ -141,12 +141,12 @@
       </div>
 
       <div>
-         <form id="cb_control_form">
+         <form id="cb_control_form" onsubmit="return false;">
             <div id="cb_controls">
-               <button id="cb_undo" disabled="true">Undo</button>
-               <button id="cb_redo" disabled="true">Redo</button>
-               <button id="cb_reset">Reset</button>
-               <button id="cb_pass">Pass</button>
+               <button id="cb_undo" type="button" disabled="true">Undo</button>
+               <button id="cb_redo" type="button" disabled="true">Redo</button>
+               <button id="cb_reset" type="button">Reset</button>
+               <button id="cb_pass" type="button">Pass</button>
                <span id="cb_message"></span><br>
             </div>
             <div id="cb_names">
@@ -183,7 +183,7 @@
       </div>
 
       <div style="margin-top: 1em; display: none">
-         <form id="sign">
+         <form id="sign" onsubmit="return false;">
             <input id="alias" placeholder="username">
             <input id="pass" type="password" placeholder="passphrase">
             <input id="in" type="submit" value="sign in">
@@ -194,7 +194,7 @@
          <div id="todo" style="display: none">
             <ul id="todo_list"></ul>
 
-            <form id="said">
+            <form id="said" onsubmit="return false;">
                <input id="say">
                <input id="speak" type="submit" value="speak">
                <input id="sign_out" type="button" value="sign out">

js/chess.js

@@ -454,7 +454,10 @@ function renderBoard(board){
       $('#cb_board .ui-draggable').draggable('disable');
       $('#cb_phantom .ui-draggable-disabled').filter(clss).draggable('enable');
    } else {
-      $('#cb_board .ui-draggable-disabled').filter(clss).draggable('enable');
+      $('#cb_board .ui-draggable').draggable('disable');
+      if (!board['move'] || !board['move']['took'] || board['move']['took'][0] !== 'k') {
+         $('#cb_board .ui-draggable-disabled').filter(clss).draggable('enable');
+      }
    }
 
    if (board['move']) {