diff --git a/models/round_result.js b/models/round_result.js
new file mode 100644
index 0000000..ea010ab
--- /dev/null
+++ b/models/round_result.js
@@ -0,0 +1,58 @@
+"use strict";
+
+import { Round, Team } from "./round.js";
+
+export default class RoundResult {
+  /** How many points the round was worth.
+   * @type {number}
+   */
+  #points;
+  /** Who wan the round.
+   * @type {Team}
+   */
+  #winner;
+
+  constructor(value, winner) {
+    if (typeof value === "number"
+      && (winner === Team.We || winner === Team.They))
+    {
+      this.#points = value;
+      this.#winner = winner;
+    } else if (typeof value === "object" && winner === undefined) {
+      if (!("points" in value))
+        throw new TypeError("missing points in deserialization object");
+      if (typeof value.points !== "number")
+        throw new TypeEror("points in deserialization object must be number");
+      this.#points = value.points;
+
+      if (!("winner" in value))
+        throw new TypeError("missing winner in deserialization object");
+      if (value.winner !== Team.We && value.winner !== Team.They)
+        throw new TypeError("winner in deserialization object not real team");
+      this.#winner = value.winner;
+    } else {
+      throw new TypeError("unknown form for RoundResult constructor");
+    }
+  }
+
+  /** Get the points the round was worth. */
+  get points() {
+    return this.#points;
+  }
+
+  /** Get the winner of the round.
+   *
+   * @returns {Team} The winner of the round.
+   */
+  get winner() {
+    return this.#winner;
+  }
+
+  /** Export needed data for JSON serialization. */
+  toJSON() {
+    return {
+      points: this.#points,
+      winner: this.#winner,
+    };
+  }
+}
diff --git a/models/round_result.test.js b/models/round_result.test.js
new file mode 100644
index 0000000..5d2ad60
--- /dev/null
+++ b/models/round_result.test.js
@@ -0,0 +1,52 @@
+"use strict";
+
+import { Team } from "./round.js";
+import RoundResult from "./round_result.js";
+
+QUnit.module("models", function() {
+  QUnit.module("RoundResult", function() {
+    QUnit.test("regular construction", function(assert) {
+      let rr = new RoundResult(2, Team.We);
+      assert.strictEqual(rr.points, 2, "correct points");
+      assert.strictEqual(rr.winner, Team.We, "correct winner");
+    });
+
+    QUnit.test("serialization", function(assert) {
+      let rr = new RoundResult(3, Team.They);
+      assert.deepEqual(
+        rr.toJSON(),
+        {
+          points: 3,
+          winner: Team.They,
+        },
+        "correct serialization object",
+      );
+    });
+
+    QUnit.test("deserialization", function(assert) {
+      let rr = new RoundResult({
+        points: 4,
+        winner: Team.We,
+      });
+      assert.strictEqual(rr.points, 4, "correct points");
+      assert.strictEqual(rr.winner, Team.We, "correct winner");
+    });
+
+    QUnit.test("invalid deserialization", function(assert) {
+      let deso = {};
+      assert.throws(function() { new RoundResult(deso); }, "no points");
+
+      deso.points = "5";
+      assert.throws(function() { new RoundResult(deso); }, "string points");
+
+      deso.points = 5;
+      assert.throws(function() { new RoundResult(deso); }, "no winner");
+
+      deso.winner = "Team.They";
+      assert.throws(function() { new RoundResult(deso); }, "string winner");
+
+      deso.winner = Team.They;
+      new RoundResult(deso);
+    });
+  });
+});
diff --git a/test.html b/test.html
index 8aceb3d..ace4f27 100644
--- a/test.html
+++ b/test.html
@@ -12,6 +12,7 @@
   <div id="qunit-fixture"></div>
   <script src="vendored/qunit-2.25.0.js"></script>
   <script src="models/round.test.js" type="module"></script>
+  <script src="models/round_result.test.js" type="module"></script>
 </body>
 
 </html>
\ No newline at end of file