diff --git a/BNNBot_garage/BNNBot b/BNNBot_garage/BNNBot
index 30cb43d..88a0d87 100755
Binary files a/BNNBot_garage/BNNBot and b/BNNBot_garage/BNNBot differ
diff --git a/BNNBot_garage/src/BNNBot.nim b/BNNBot_garage/src/BNNBot.nim
index 8cd3794..bd571d0 100644
--- a/BNNBot_garage/src/BNNBot.nim
+++ b/BNNBot_garage/src/BNNBot.nim
@@ -20,6 +20,8 @@ type
     heading:     float   # enemy heading (degrees)
     distance:    float
     tick:        int
+    prevVec:     BinaryVector
+    hasPrev:     bool
 
 method onScannedBot*(bot: BNNBot, e: ScannedBotEvent) =
   let bx = getX(); let by = getY()
@@ -41,7 +43,10 @@ method onScannedBot*(bot: BNNBot, e: ScannedBotEvent) =
     heading:  bot.heading,
   )
   let vec = encode(scan)
-  echo $bot.tick, " ", formatBinary(vec)
+  let distance = if bot.hasPrev: hammingDistance(bot.prevVec, vec) else: 0
+  echo $bot.tick, " ", formatBinary(vec), " ", distance
+  bot.prevVec = vec
+  bot.hasPrev = true
 
 method onRoundStarted*(bot: BNNBot, e: RoundStartedEvent) =
   setAdjustGunForBodyTurn(true)
@@ -51,6 +56,7 @@ method onRoundStarted*(bot: BNNBot, e: RoundStartedEvent) =
   bot.hasContact  = false
   bot.hasLastPos  = false
   bot.tick        = 0
+  bot.hasPrev     = false
   setTargetSpeed(0.0)
   setTurnRate(0.0)