diff --git a/src/ALife/Creatur/Wain/UIVector/Prediction/Experiment.hs b/src/ALife/Creatur/Wain/UIVector/Prediction/Experiment.hs
index 9f851ad..ef0c809 100644
--- a/src/ALife/Creatur/Wain/UIVector/Prediction/Experiment.hs
+++ b/src/ALife/Creatur/Wain/UIVector/Prediction/Experiment.hs
@@ -58,7 +58,7 @@ import ALife.Creatur.Wain.UIVector.Tweaker (PatternTweaker(..))
 import qualified ALife.Creatur.Wain.UIVector.Wain as UW
 import ALife.Creatur.Wain.UnitInterval (UIDouble, uiToDouble,
   doubleToUI)
-import ALife.Creatur.Wain.Util (unitInterval, enforceRange, inRange)
+import ALife.Creatur.Wain.Util (unitInterval)
 import ALife.Creatur.Wain.Weights (makeWeights)
 import Control.Conditional (whenM)
 import Control.Lens hiding (universe)
@@ -235,21 +235,12 @@ startRound = do
   ps <- zoom U.uNewPredictions getPS
   zoom U.uPreviousPredictions $ putPS ps
   zoom U.uNewPredictions $ putPS []
-  let wombat = map thirdOfThree ps
-  U.writeToLog $ "Debug: predictions" ++ show wombat
   when (not . null $ ps) $ do
     let predicted = mean . map (uiToDouble . thirdOfThree) $ ps
     let err = abs (uiToDouble actual - predicted)
     U.writeToLog $ "actual=" ++ show actual
       ++ " predicted=" ++ show predicted
       ++ " err=" ++ show err
-  margin <- use U.uAccuracyMargin
-  let a = doubleToUI . enforceRange unitInterval $
-            (uiToDouble actual - uiToDouble margin)
-  let b = doubleToUI . enforceRange unitInterval $
-            (uiToDouble actual + uiToDouble margin)
-  zoom U.uCurrentAccuracyRange $ putPS (a, b)
-  U.writeToLog $ "margins=" ++ show (a, b)
 
 finishRound :: StateT (U.Universe PatternWain) IO ()
 finishRound = do
@@ -380,11 +371,11 @@ rewardPrediction = do
     Nothing ->
       zoom universe . U.writeToLog $ "First turn for " ++ agentId a
     Just (r, predicted) -> do
-      range <- zoom (universe . U.uCurrentAccuracyRange) getPS
       accuracyDeltaE <- use (universe . U.uAccuracyDeltaE)
-      let deltaE = if inRange range predicted then accuracyDeltaE else 0
-      adjustWainEnergy subject deltaE rPredDeltaE "prediction"
       actual <- head <$> zoom (universe . U.uCurrVector) getPS
+      let accuracy = 1 - abs(actual - predicted) :: UIDouble
+      let deltaE = uiToDouble accuracy * accuracyDeltaE
+      adjustWainEnergy subject deltaE rPredDeltaE "prediction"
       zoom universe . U.writeToLog $
         agentId a ++ " predicted " ++ show predicted
         ++ ", actual value was " ++ show actual
diff --git a/src/ALife/Creatur/Wain/UIVector/Prediction/Universe.hs b/src/ALife/Creatur/Wain/UIVector/Prediction/Universe.hs
index 6b65cc4..7607445 100644
--- a/src/ALife/Creatur/Wain/UIVector/Prediction/Universe.hs
+++ b/src/ALife/Creatur/Wain/UIVector/Prediction/Universe.hs
@@ -69,7 +69,6 @@ module ALife.Creatur.Wain.UIVector.Prediction.Universe
     uCheckpoints,
     uCurrVector,
     uPrevVector,
-    uCurrentAccuracyRange,
     uPreviousPredictions,
     uNewPredictions,
     -- * Other
@@ -154,7 +153,6 @@ data Universe a = Universe
     _uCheckpoints :: [CP.Checkpoint],
     _uCurrVector :: Persistent [UIDouble],
     _uPrevVector :: Persistent [UIDouble],
-    _uCurrentAccuracyRange :: Persistent (UIDouble, UIDouble),
     _uPreviousPredictions
       :: Persistent [(AgentId, Response Action, UIDouble)],
     _uNewPredictions :: Persistent [(AgentId, Response Action, UIDouble)]
@@ -360,9 +358,6 @@ config2Universe getSetting =
       _uCheckpoints = getSetting cCheckpoints,
       _uCurrVector = mkPersistent zeroes (workDir ++ "/currVector"),
       _uPrevVector = mkPersistent zeroes (workDir ++ "/prevVector"),
-      _uCurrentAccuracyRange
-        = mkPersistent (doubleToUI 0, doubleToUI 0)
-            (workDir ++ "/accuracy"),
       _uPreviousPredictions
         = mkPersistent [] (workDir ++ "/prevPredictions"),
       _uNewPredictions = mkPersistent [] (workDir ++ "/newPredictions")