--- a/ai.js	Wed Sep 10 13:26:10 2014 +0300
+++ b/ai.js	Wed Sep 10 14:49:28 2014 +0300
@@ -1,8 +1,8 @@
 "use strict";
 
 var ai = {};
-ai.dirs = ["up", "down", "left", "right"];
-ai.canDirs = ["canUp", "canDown", "canLeft", "canRight"];
+ai.dirs = ["up", "right", "down", "left"];
+ai.canDirs = ["canUp", "canRight", "canDown", "canLeft"];
 
 // Each strategy is a function that except current board position as 2d array and context from
 // previous call to share state/precomputed values between calls.
@@ -10,7 +10,7 @@
 
 
 ////////////////////////////////////////////////////////////////
-// Random AI.
+// Blind random AI.
 ////////////////////////////////////////////////////////////////
 
 ai.blindRandom = function(brdEngine) {
@@ -20,8 +20,8 @@
     var origBrd = new this.brdEngine(brd);
     while (true) {
         var rnd = Math.floor(Math.random()*4);
-        if (origBrd[["canUp", "canDown", "canLeft", "canRight"][rnd]]())
-            return ["up", "down", "left", "right"][rnd];
+        if (origBrd[ai.canDirs[rnd]]())
+            return ai.dirs[rnd];
     }
 }
 /* Mark that next board will be unrelated to previous, so any stored precompution can be cleared. */
@@ -30,6 +30,49 @@
 
 
 ////////////////////////////////////////////////////////////////
+// Blind weight random AI.
+////////////////////////////////////////////////////////////////
+
+ai.blindWeightRandom = function(brdEngine, cfg) {
+    this.brdEngine = brdEngine;
+    this.cfg = this.cfg || {};
+    var left = ai.blindWeightRandom.fixWeight(this.cfg.left);
+    var right = ai.blindWeightRandom.fixWeight(this.cfg.right);
+    var up = ai.blindWeightRandom.fixWeight(this.cfg.up);
+    var down = ai.blindWeightRandom.fixWeight(this.cfg.down);
+    var total = left + right + up + down;
+    this.threshold1 = left/total;
+    this.threshold2 = (left+down)/total;
+    this.threshold3 = (left+down+right)/total;
+}
+ai.blindWeightRandom.fixWeight = function(val) {
+    val = val && parseFloat(v) || 1;
+    if (val <= 0)
+        val = 1;
+    return val;
+}
+ai.blindWeightRandom.prototype.analyse = function(brd) {
+    var origBrd = new this.brdEngine(brd);
+    while (true) {
+        var rnd = Math.random();
+        if (rnd < this.threshold1)
+            var dir = 0;
+        else if (rnd < this.threshold2)
+            var dir = 1;
+        else if (rnd < this.threshold3)
+            var dir = 2;
+        else
+            var dir = 3;
+        if (origBrd[ai.canDirs[dir]]())
+            return ai.dirs[dir];
+    }
+}
+/* Mark that next board will be unrelated to previous, so any stored precompution can be cleared. */
+ai.blindWeightRandom.prototype.cleanup = function() { }
+
+
+
+////////////////////////////////////////////////////////////////
 // Blind cycle AI.
 ////////////////////////////////////////////////////////////////