diff -r b3bfa9d1b537 -r 9b49e710f5a7 board.js
--- a/board.js	Sun Sep 07 14:16:26 2014 +0300
+++ b/board.js	Sun Sep 07 23:30:11 2014 +0300
@@ -59,6 +59,13 @@
 BoardArr2d.prototype.set = function(i, j, val) {
     this.brd[i][j] = val;
 }
+BoardArr2d.prototype.equals = function(brd) {
+    for (var i = 0; i < 4; i++)
+        for (var j = 0; j < 4; j++)
+            if (this.brd[i][j] !== brd.brd[i][j])
+                return false;
+    return true;
+}
 /* Return and optionally fill 2d board. */
 BoardArr2d.prototype.exportTo = function(brd) {
     brd = brd || [[],[],[],[]];
@@ -85,6 +92,15 @@
     }
     return score;
 }
+BoardArr2d.prototype.max = function() {
+    var max = 0;
+    for (var i = 0; i < 4; i++) {
+        for (var j = 0; j < 4; j++) {
+            max = Math.max(max, this.brd[i][j]);
+        }
+    }
+    return max;
+}
 
 BoardArr2d.prototype.canRight = function() {
     for (var i = 0; i < 4; i++) {