--- a/2048.html	Thu Sep 18 11:01:03 2014 +0300
+++ b/2048.html	Sat Sep 20 00:44:00 2014 +0300
@@ -79,7 +79,7 @@
       border: 1px solid tan;
       border-radius: 4px;
     }
-    div.ai > div.option > input.positive, div.settings > div.setting > input {
+    div.ai > div.option > input.positive, div.settings > div.setting > input, div.ai-control input.positive {
       text-align: right;
       max-width: 4em;
       margin-right: 2px;
@@ -162,6 +162,11 @@
       <button id="step">Step</button>
       <button id="finish">Finish</button>
     </div>
+    <div class="ai-control">
+      <button id="until">Continue</button>
+      until <input type="text" class="positive" id="until-score" value="10000"> score
+      and <input type="text" class="positive" id="until-max-value" value="9"> max value
+    </div>
     <div class="clearfix"></div>
     <div class="move-control">
       <table>
@@ -484,14 +489,17 @@
         return false;
       return true;
     }
-    ui.game.finishStep = function() {
-      board.putRandom(ui.board.position);
-      ui.board.turn++;
+    ui.game.refresh = function() {
       ui.board.update(ui.board.position);
       ui.score.update(ui.board.position, ui.board.turn);
       localStorage.savedBoard = JSON.stringify(ui.board.position);
       localStorage.savedTurn = ui.board.turn;
     }
+    ui.game.finishStep = function() {
+      board.putRandom(ui.board.position);
+      ui.board.turn++;
+      ui.game.refresh();
+    }
 
     ////////////////////////////////////////////////////////////////
     // Actions.
@@ -613,6 +621,57 @@
     }
     document.getElementById("finish").addEventListener("click", ui.action.finish, false);
 
+    ui.action.until = function() {
+      if ( ! ui.ai.current) {
+        ui.game.setMessage('Select AI!');
+        return;
+      }
+      if ( ! ui.game.beginStep())
+        return;
+      var step = 0;
+      var safeBdr = board.create();
+      var tsFrom = new Date().getTime();
+      var scoreLimit = parseInt(document.getElementById("until-score").value);
+      if (!isFinite(scoreLimit) || scoreLimit < 0) {
+        scoreLimit = 1;
+        document.getElementById("until-score").value = scoreLimit;
+      }
+      var maxValLimit = parseInt(document.getElementById("until-max-value").value);
+      if (!isFinite(maxValLimit) || maxValLimit < 0 || maxValLimit > 13) {
+        maxValLimit = 1;
+        document.getElementById("until-max-value").value = maxValLimit;
+      }
+      while (true) {
+        if (board.gameOver(ui.board.position)) {
+          ui.game.setMessage("Game over!");
+          break;
+        }
+        var stat = board.score(ui.board.position);
+        if (stat.score >= scoreLimit && stat.max >= maxValLimit)
+          break;
+        board.copy(ui.board.position, safeBdr);
+        var move = ui.ai.current.analyse(safeBdr);
+        if (typeof move === 'undefined') {
+          ui.game.setMessage("I don't know how to move!");
+          return;
+        }
+        var updated = board.move[move].call(null, ui.board.position);
+        if (updated) {
+          board.putRandom(ui.board.position);
+        } else {
+          ui.game.finishStep();
+          ui.game.setMessage("Wrong move!");
+          return;
+        }
+        step++; 
+      }
+      var tsTo = new Date().getTime();
+      ui.game.refresh();
+      ui.score.speed(parseFloat((step*1000.0/(tsTo-tsFrom)).toPrecision(3)), step);
+      ui.ai.current && ui.ai.current.cleanup();
+    }
+    document.getElementById("until").addEventListener("click", ui.action.until, false);
+
     ////////////////////////////////////////////////////////////////
     // Register AIs.