diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4b72604..10fc5cd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,9 @@
 
+## 1.20.1.0
+
+* Fix Soft2D-F1 metric
+* Check for invalid rectangles in Soft2D-F1 metric
+
 ## 1.20.0.0
 
 * Add --list-metrics options
diff --git a/geval.cabal b/geval.cabal
index b46a6b8..775b386 100644
--- a/geval.cabal
+++ b/geval.cabal
@@ -1,5 +1,5 @@
 name:                geval
-version:             1.20.0.0
+version:             1.20.1.0
 synopsis:            Machine learning evaluation tools
 description:         Please see README.md
 homepage:            http://github.com/name/project
diff --git a/src/GEval/Clippings.hs b/src/GEval/Clippings.hs
index 5b20b64..9b3b527 100644
--- a/src/GEval/Clippings.hs
+++ b/src/GEval/Clippings.hs
@@ -104,11 +104,13 @@ rectangleParser = do
   x1 <- decimal
   char ','
   y1 <- decimal
-  return $ Rectangle (Point x0 y0) (Point x1 y1)
+  if x1 < x0 || y1 < y0
+  then fail "wrong coordinates"
+  else return $ Rectangle (Point x0 y0) (Point x1 y1)
 
 rectangleArea :: Rectangle -> Integer
 rectangleArea (Rectangle (Point x0 y0) (Point x1 y1)) =
-  (fromIntegral $ x1 - x0) * (fromIntegral $ y1 - y0)
+  (fromIntegral $ x1 - x0 + 1) * (fromIntegral $ y1 - y0 + 1)
 
 clippingArea :: LabeledClipping -> Integer
 clippingArea (LabeledClipping _ (Clipping _ rect)) = rectangleArea rect
diff --git a/src/GEval/MetricsMeta.hs b/src/GEval/MetricsMeta.hs
index eb84ad9..84c0fb0 100644
--- a/src/GEval/MetricsMeta.hs
+++ b/src/GEval/MetricsMeta.hs
@@ -121,8 +121,8 @@ expectedScore (EvaluationScheme (SoftFMeasure beta) [])
         recall = 0.75
       in weightedHarmonicMean beta precision recall
 expectedScore (EvaluationScheme (Soft2DFMeasure beta) [])
-  = let precision = 0.21117747440273
-        recall = 0.27423822714681
+  = let precision = 0.211622914314256
+        recall = 0.2749908502976
       in (weightedHarmonicMean beta precision recall) / 2.0
 
 listOfAvailableEvaluationSchemes :: [EvaluationScheme]
diff --git a/test/Spec.hs b/test/Spec.hs
index 57222e9..047eb3d 100644
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -276,7 +276,9 @@ main = hspec $ do
       runGEvalTest "probabilistic-soft-f1-calibrated" `shouldReturnAlmost` 0.88888888888
   describe "Soft2D-F1" $ do
     it "simple test" $ do
-      runGEvalTest "soft2d-f1-simple" `shouldReturnAlmost` 0.218457349437945
+      runGEvalTest "soft2d-f1-simple" `shouldReturnAlmost` 0.22053934201995676
+    it "very narrow rectangles" $ do
+      runGEvalTest "soft2d-f1-one-pixel" `shouldReturnAlmost` 0.281992045358382
   describe "test edit-distance library" $ do
     it "for handling UTF8" $ do
       levenshteinDistance defaultEditCosts "źdźbło" "źd好bło" `shouldBe` 1
diff --git a/test/soft2d-f1-one-pixel/soft2d-f1-one-pixel-solution/test-A/out.tsv b/test/soft2d-f1-one-pixel/soft2d-f1-one-pixel-solution/test-A/out.tsv
new file mode 100644
index 0000000..252ddf8
--- /dev/null
+++ b/test/soft2d-f1-one-pixel/soft2d-f1-one-pixel-solution/test-A/out.tsv
@@ -0,0 +1,6 @@
+3/100,200,100,200
+3/100,200,101,200
+3/100,200,100,200
+3/100,200,102,202
+2/1000,2000,1000,2000 1/1000,2000,1000,2000
+1/100,150,300,350
diff --git a/test/soft2d-f1-one-pixel/soft2d-f1-one-pixel/config.txt b/test/soft2d-f1-one-pixel/soft2d-f1-one-pixel/config.txt
new file mode 100644
index 0000000..f5443ee
--- /dev/null
+++ b/test/soft2d-f1-one-pixel/soft2d-f1-one-pixel/config.txt
@@ -0,0 +1 @@
+--metric Soft2D-F1
diff --git a/test/soft2d-f1-one-pixel/soft2d-f1-one-pixel/test-A/expected.tsv b/test/soft2d-f1-one-pixel/soft2d-f1-one-pixel/test-A/expected.tsv
new file mode 100644
index 0000000..681b9cb
--- /dev/null
+++ b/test/soft2d-f1-one-pixel/soft2d-f1-one-pixel/test-A/expected.tsv
@@ -0,0 +1,6 @@
+3/100,200,100,400
+3/100,200,101,201
+3/100,200,101,201
+3/100,200,101,201
+3/1000,2000,1000,2000 4/1000,2000,1000,2000
+2/100,150,300,350