diff --git a/exercises/go-counting/canonical-data.json b/exercises/go-counting/canonical-data.json
new file mode 100644
index 0000000000..a2e0efd7c0
--- /dev/null
+++ b/exercises/go-counting/canonical-data.json
@@ -0,0 +1,200 @@
+{
+  "exercise": "go-counting",
+  "version": "1.0.0",
+  "comments": [
+    "Territory consists of [x, y] coordinate pairs."
+  ],
+  "cases": [
+    {
+      "description": "Black corner territory on 5x5 board",
+      "property": "territory",
+      "input": {
+        "board": [
+          "  B  ",
+          " B B ",
+          "B W B",
+          " W W ",
+          "  W  "
+        ],
+        "x": 0,
+        "y": 1
+      },
+      "expected": {
+        "owner": "BLACK",
+        "territory": [[0, 0], [0, 1], [1, 0]]
+      }
+    },
+    {
+      "description": "White center territory on 5x5 board",
+      "property": "territory",
+      "input": {
+        "board": [
+          "  B  ",
+          " B B ",
+          "B W B",
+          " W W ",
+          "  W  "
+        ],
+        "x": 2,
+        "y": 3
+      },
+      "expected": {
+        "owner": "WHITE",
+        "territory": [[2, 3]]
+      }
+    },
+    {
+      "description": "Open corner territory on 5x5 board",
+      "property": "territory",
+      "input": {
+        "board": [
+          "  B  ",
+          " B B ",
+          "B W B",
+          " W W ",
+          "  W  "
+        ],
+        "x": 1,
+        "y": 4
+      },
+      "expected": {
+        "owner": "NONE",
+        "territory": [[0, 3], [0, 4], [1, 4]]
+      }
+    },
+    {
+      "description": "A stone and not a territory on 5x5 board",
+      "property": "territory",
+      "input": {
+        "board": [
+          "  B  ",
+          " B B ",
+          "B W B",
+          " W W ",
+          "  W  "
+        ],
+        "x": 1,
+        "y": 1
+      },
+      "expected": {
+        "owner": "NONE",
+        "territory": []
+      }
+    },
+    {
+      "description": "Invalid because X is too low for 5x5 board",
+      "property": "territory",
+      "input": {
+        "board": [
+          "  B  ",
+          " B B ",
+          "B W B",
+          " W W ",
+          "  W  "
+        ],
+        "x": -1,
+        "y": 1
+      },
+      "expected": {
+        "error": "Invalid coordinate"
+      }
+    },
+    {
+      "description": "Invalid because X is too high for 5x5 board",
+      "property": "territory",
+      "input": {
+        "board": [
+          "  B  ",
+          " B B ",
+          "B W B",
+          " W W ",
+          "  W  "
+        ],
+        "x": 5,
+        "y": 1
+      },
+      "expected": {
+        "error": "Invalid coordinate"
+      }
+    },
+    {
+      "description": "Invalid because Y is too low for 5x5 board",
+      "property": "territory",
+      "input": {
+        "board": [
+          "  B  ",
+          " B B ",
+          "B W B",
+          " W W ",
+          "  W  "
+        ],
+        "x": 1,
+        "y": -1
+      },
+      "expected": {
+        "error": "Invalid coordinate"
+      }
+    },
+    {
+      "description": "Invalid because Y is too high for 5x5 board",
+      "property": "territory",
+      "input": {
+        "board": [
+          "  B  ",
+          " B B ",
+          "B W B",
+          " W W ",
+          "  W  "
+        ],
+        "x": 1,
+        "y": 5
+      },
+      "expected": {
+        "error": "Invalid coordinate"
+      }
+    },
+    {
+      "description": "One territory is the whole board",
+      "property": "territories",
+      "input": {
+        "board": [
+          " "
+        ]
+      },
+      "expected": {
+        "territoryBlack": [],
+        "territoryWhite": [],
+        "territoryNone": [[0, 0]]
+      }
+    },
+    {
+      "description": "Two territory rectangular board",
+      "property": "territories",
+      "input": {
+        "board": [
+          " BW ",
+          " BW "
+        ]
+      },
+      "expected": {
+        "territoryBlack": [[0, 0], [0, 1]],
+        "territoryWhite": [[3, 0], [3, 1]],
+        "territoryNone": []
+      }
+    },
+    {
+      "description": "Two region rectangular board",
+      "property": "territories",
+      "input": {
+        "board": [
+          " B "
+        ]
+      },
+      "expected": {
+        "territoryBlack": [[0, 0], [2, 0]],
+        "territoryWhite": [],
+        "territoryNone": []
+      }
+    }
+  ]
+}
diff --git a/exercises/go-counting/description.md b/exercises/go-counting/description.md
index 6127207b4f..4e5c012f09 100644
--- a/exercises/go-counting/description.md
+++ b/exercises/go-counting/description.md
@@ -9,6 +9,8 @@ Write a function that determines the territory of each player. You may
 assume that any stones that have been stranded in enemy territory have
 already been taken off the board.
 
+Write a function that determines the territory which includes a specified coordinate.
+
 Multiple empty intersections may be encircled at once and for encircling
 only horizontal and vertical neighbours count. In the following diagram
 the stones which matter are marked "O" and the stones that don't are