diff --git a/src/GEval/Core.hs b/src/GEval/Core.hs
index c5a7194..bed64b7 100644
--- a/src/GEval/Core.hs
+++ b/src/GEval/Core.hs
@@ -83,7 +83,7 @@ defaultLogLossHashedSize :: Word32
 defaultLogLossHashedSize = 10
 
 data Metric = RMSE | MSE | BLEU | Accuracy | ClippEU | FMeasure Double | NMI | LogLossHashed Word32 | CharMatch
-              | MAP | LogLoss | BIOF1
+              | MAP | LogLoss | Likelihood | BIOF1 | LikelihoodHashed Word32
               deriving (Eq)
 
 instance Show Metric where
@@ -100,9 +100,16 @@ instance Show Metric where
                                                        ""
                                                       else
                                                        (show nbOfBits))
+  show (LikelihoodHashed nbOfBits) = "LikelihoodHashed" ++ (if
+                                                               nbOfBits == defaultLogLossHashedSize
+                                                            then
+                                                              ""
+                                                            else
+                                                              (show nbOfBits))
   show CharMatch = "CharMatch"
   show MAP = "MAP"
   show LogLoss = "LogLoss"
+  show Likelihood = "Likelihood"
   show BIOF1 = "BIO-F1"
 
 instance Read Metric where
@@ -118,7 +125,11 @@ instance Read Metric where
   readsPrec p ('L':'o':'g':'L':'o':'s':'s':'H':'a':'s':'h':'e':'d':theRest) = case readsPrec p theRest of
     [(nbOfBits, theRest)] -> [(LogLossHashed nbOfBits, theRest)]
     _ -> [(LogLossHashed defaultLogLossHashedSize, theRest)]
+  readsPrec p ('L':'i':'k':'e':'l':'i':'h':'o':'o':'d':'H':'a':'s':'h':'e':'d':theRest) = case readsPrec p theRest of
+    [(nbOfBits, theRest)] -> [(LikelihoodHashed nbOfBits, theRest)]
+    _ -> [(LikelihoodHashed defaultLogLossHashedSize, theRest)]
   readsPrec _ ('L':'o':'g':'L':'o':'s':'s':theRest) = [(LogLoss, theRest)]
+  readsPrec _ ('L':'i':'k':'e':'l':'i':'h':'o':'o':'d':theRest) = [(Likelihood, theRest)]
   readsPrec p ('C':'h':'a':'r':'M':'a':'t':'c':'h':theRest) = [(CharMatch, theRest)]
   readsPrec _ ('M':'A':'P':theRest) = [(MAP, theRest)]
   readsPrec _ ('B':'I':'O':'-':'F':'1':theRest) = [(BIOF1, theRest)]
@@ -134,9 +145,11 @@ getMetricOrdering ClippEU  = TheHigherTheBetter
 getMetricOrdering (FMeasure _) = TheHigherTheBetter
 getMetricOrdering NMI = TheHigherTheBetter
 getMetricOrdering (LogLossHashed _) = TheLowerTheBetter
+getMetricOrdering (LikelihoodHashed _) = TheHigherTheBetter
 getMetricOrdering CharMatch = TheHigherTheBetter
 getMetricOrdering MAP = TheHigherTheBetter
 getMetricOrdering LogLoss = TheLowerTheBetter
+getMetricOrdering Likelihood = TheHigherTheBetter
 getMetricOrdering BIOF1 = TheHigherTheBetter
 
 defaultOutDirectory = "."
@@ -308,6 +321,8 @@ gevalCore metric inputFilePath expectedFilePath outFilePath = do
                      (fileAsLineSource expectedFilePath)
                      (fileAsLineSource outFilePath)
 
+logLossToLikehood logLoss = exp (-logLoss)
+
 gevalCoreOnSources :: (MonadIO m, MonadThrow m, MonadBaseControl IO m) => Metric
                      -> LineSource (ResourceT m)
                      -> LineSource (ResourceT m)
@@ -317,6 +332,14 @@ gevalCoreOnSources RMSE inputLineSource expectedLineSource outLineSource = do
   mse <- gevalCoreOnSources MSE inputLineSource expectedLineSource outLineSource
   return $ mse ** 0.5
 
+gevalCoreOnSources Likelihood inputLineSource expectedLineSource outLineSource = do
+  logLoss <- gevalCoreOnSources LogLoss inputLineSource expectedLineSource outLineSource
+  return $ logLossToLikehood logLoss
+
+gevalCoreOnSources (LikelihoodHashed b) inputLineSource expectedLineSource outLineSource = do
+  logLoss <- gevalCoreOnSources (LogLossHashed b) inputLineSource expectedLineSource outLineSource
+  return $ logLossToLikehood logLoss
+
 gevalCoreOnSources metric inputLineSource expectedLineSource outLineSource = do
   gevalCore' metric inputLineSource expectedLineSource outLineSource
 
diff --git a/src/GEval/CreateChallenge.hs b/src/GEval/CreateChallenge.hs
index 3e00993..0d141d5 100644
--- a/src/GEval/CreateChallenge.hs
+++ b/src/GEval/CreateChallenge.hs
@@ -101,6 +101,8 @@ Cluster proverbs for languages.
 This is a sample challenge for flat clustering (unsupervised learning challenge).
 |] ++ (commonReadmeMDContents testName)
 
+readmeMDContents (LikelihoodHashed b) testname = readmeMDContents (LogLossHashed b) testname
+
 readmeMDContents (LogLossHashed _) testName = [i|
 GEval sample challenge — language model evaluation
 ==================================================
@@ -203,6 +205,16 @@ This a sample challenge for the log-loss metric.
 
 |] ++ (commonReadmeMDContents testName)
 
+readmeMDContents Likelihood testName = [i|
+Give the probability of a positive sentiment
+============================================
+
+Give the probability that a sentence expresses a positive sentiment.
+
+This a sample challenge for the likelihood metric.
+
+|] ++ (commonReadmeMDContents testName)
+
 readmeMDContents BIOF1 testName = [i|
 Tag and normalize names
 =======================
@@ -284,6 +296,7 @@ trainContents NMI = [hereLit|pl	Kto pod kim dołki kopie, ten sam w nie wpada.
 en	The pen is mightier than the sword.
 pl	Baba z wozu, koniom lżej.
 |]
+trainContents (LikelihoodHashed b) = trainContents (LogLossHashed b)
 trainContents (LogLossHashed _) = [hereLit|Ala ma psa i kota
 Basia ma psa
 Nie kupujemy kota w worku
@@ -299,6 +312,7 @@ honour	GB	honor
 titbit	GB	smakołyk
 tidbit	US	smakołyk
 |]
+trainContents Likelihood = trainContents LogLoss
 trainContents LogLoss = [hereLit|0.0	Hell, no!!!
 0.0	I hate this stuff
 1.0	Lekker!!!
@@ -328,6 +342,7 @@ When the going gets tough, the tough get going.
 devInContents (FMeasure _) = [hereLit|b	b	W	29520	779	-28	-32	a	0	0	0	0	0	0	0	0	0	0
 b	b	W	55200	1259	35	9	a	1	0	1	0	0	0	0	0	4000	4000
 |]
+devInContents (LikelihoodHashed b) = devInContents (LogLossHashed b)
 devInContents (LogLossHashed _) = [hereLit|Nie kupuj	w worku
 Ona	psa
 |]
@@ -339,6 +354,7 @@ devInContents MAP = [hereLit|US	noc
 GB	wózek dziecięcy
 GB	wizualizować
 |]
+devInContents Likelihood = devInContents LogLoss
 devInContents LogLoss = [hereLit|Great stuff!
 Boring stuff
 That's good
@@ -364,6 +380,7 @@ devExpectedContents NMI = [hereLit|en
 pl
 en
 |]
+devExpectedContents (LikelihoodHashed b) = devExpectedContents (LogLossHashed b)
 devExpectedContents (LogLossHashed _) = [hereLit|kota
 ma
 |]
@@ -375,6 +392,7 @@ devExpectedContents MAP = [hereLit|night	nite
 pram
 visualise
 |]
+devExpectedContents Likelihood = devExpectedContents LogLoss
 devExpectedContents LogLoss = [hereLit|1.0
 0.0
 1.0
@@ -402,6 +420,7 @@ W marcu, jak w garncu.
 A cada necio agrada su porrada.
 Kwiecień plecień, bo przeplata trochę zimy, trochę lata.
 |]
+testInContents (LikelihoodHashed b) = testInContents (LogLossHashed b)
 testInContents (LogLossHashed _) = [hereLit|Ala	ma
 Ona ma kota	worku
 |]
@@ -413,6 +432,7 @@ testInContents MAP = [hereLit|US	wózek dziecięcy
 GB	słoń
 US	słoń
 |]
+testInContents Likelihood = testInContents LogLoss
 testInContents LogLoss = [hereLit|That's great, ha, ha, I love it!
 Super-duper!!
 That is incredibly boring.
@@ -440,6 +460,7 @@ pl
 es
 pl
 |]
+testExpectedContents (LikelihoodHashed b) = testExpectedContents (LogLossHashed b)
 testExpectedContents (LogLossHashed _) = [hereLit|ma
 w
 |]
@@ -451,6 +472,7 @@ testExpectedContents MAP = [hereLit|trolley
 elephant
 elephant
 |]
+testExpectedContents Likelihood = testExpectedContents LogLoss
 testExpectedContents LogLoss = [hereLit|1.0
 1.0
 0.0
diff --git a/src/GEval/OptionsParser.hs b/src/GEval/OptionsParser.hs
index eaabd31..d8ce4e7 100644
--- a/src/GEval/OptionsParser.hs
+++ b/src/GEval/OptionsParser.hs
@@ -100,7 +100,7 @@ metricReader = option auto
                  <> value defaultMetric
                  <> showDefault
                  <> metavar "METRIC"
-                 <> help "Metric to be used - RMSE, MSE, Accuracy, LogLoss, F-measure (specify as F1, F2, F0.25, etc.), MAP, BLEU, NMI, ClippEU, LogLossHashed, BIO-F1 or CharMatch" )
+                 <> help "Metric to be used - RMSE, MSE, Accuracy, LogLoss, Likelihood, F-measure (specify as F1, F2, F0.25, etc.), MAP, BLEU, NMI, ClippEU, LogLossHashed, LikelihoodHashed, BIO-F1 or CharMatch" )
 
 runGEval :: [String] -> IO (Either (ParserResult GEvalOptions) (Maybe MetricValue))
 runGEval args = do
diff --git a/test/Spec.hs b/test/Spec.hs
index 5784042..68f595c 100644
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -102,6 +102,9 @@ main = hspec $ do
       runGEvalTest "log-loss-hashed-probs-normalized" `shouldReturnAlmost` 1.55537749098853
     it "with log probs whose probs are summing up to less than 1.0" $ do
       runGEvalTest "log-loss-hashed-normalization" `shouldReturnAlmost` 5.16395069238851
+  describe "LikelihoodHashed challenge" $ do
+    it "example with unnormalized values" $ do
+      runGEvalTest "likelihood-hashed-not-normalized" `shouldReturnAlmost` 0.351043364110715
 
   describe "reading options" $ do
     it "can get the metric" $ do
@@ -190,6 +193,9 @@ main = hspec $ do
       runGEvalTest "logloss-simple" `shouldReturnAlmost` 0.31824
     it "perfect" $ do
       runGEvalTest "logloss-perfect" `shouldReturnAlmost` 0.0
+  describe "Likelihood" $ do
+    it "simple" $ do
+      runGEvalTest "likelihood-simple" `shouldReturnAlmost` 0.72742818469866
   describe "evaluating single lines" $ do
     it "RMSE" $ do
       gevalCoreOnSingleLines RMSE (LineInFile "stub1" 1 "blabla")
diff --git a/test/likelihood-hashed-not-normalized/likelihood-hashed-not-normalized-solution/test-A/out.tsv b/test/likelihood-hashed-not-normalized/likelihood-hashed-not-normalized-solution/test-A/out.tsv
new file mode 100644
index 0000000..02c35e7
--- /dev/null
+++ b/test/likelihood-hashed-not-normalized/likelihood-hashed-not-normalized-solution/test-A/out.tsv
@@ -0,0 +1,2 @@
+tak:10 nie:8.9
+niebieski:0 żółty:1.5 czerwony:-0.5
diff --git a/test/likelihood-hashed-not-normalized/likelihood-hashed-not-normalized/config.txt b/test/likelihood-hashed-not-normalized/likelihood-hashed-not-normalized/config.txt
new file mode 100644
index 0000000..00b7f18
--- /dev/null
+++ b/test/likelihood-hashed-not-normalized/likelihood-hashed-not-normalized/config.txt
@@ -0,0 +1 @@
+--metric LikelihoodHashed8
diff --git a/test/likelihood-hashed-not-normalized/likelihood-hashed-not-normalized/test-A/expected.tsv b/test/likelihood-hashed-not-normalized/likelihood-hashed-not-normalized/test-A/expected.tsv
new file mode 100644
index 0000000..70d9d14
--- /dev/null
+++ b/test/likelihood-hashed-not-normalized/likelihood-hashed-not-normalized/test-A/expected.tsv
@@ -0,0 +1,2 @@
+tak
+niebieski
diff --git a/test/likelihood-simple/likelihood-simple-solution/test-A/out.tsv b/test/likelihood-simple/likelihood-simple-solution/test-A/out.tsv
new file mode 100644
index 0000000..6978be2
--- /dev/null
+++ b/test/likelihood-simple/likelihood-simple-solution/test-A/out.tsv
@@ -0,0 +1,4 @@
+0.7
+0
+0.0
+0.6
diff --git a/test/likelihood-simple/likelihood-simple/config.txt b/test/likelihood-simple/likelihood-simple/config.txt
new file mode 100644
index 0000000..34e7898
--- /dev/null
+++ b/test/likelihood-simple/likelihood-simple/config.txt
@@ -0,0 +1 @@
+--metric Likelihood
diff --git a/test/likelihood-simple/likelihood-simple/test-A/expected.tsv b/test/likelihood-simple/likelihood-simple/test-A/expected.tsv
new file mode 100644
index 0000000..968ac3e
--- /dev/null
+++ b/test/likelihood-simple/likelihood-simple/test-A/expected.tsv
@@ -0,0 +1,4 @@
+1
+0
+0
+0