diff --git a/package.json b/package.json
index af37d53..0d05bce 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "minesweeper",
-    "version": "0.0.9",
+    "version": "0.0.10",
     "description": "Just Minesweeper!",
     "author": "Felix W. Dekker",
     "browser": "dist/bundle.js",
diff --git a/src/main/js/index.js b/src/main/js/index.js
index 7c66233..e3aaab0 100644
--- a/src/main/js/index.js
+++ b/src/main/js/index.js
@@ -30,6 +30,9 @@ class Game {
         this.display = new Display(this.canvas, this.field);
         this.display.startDrawLoop();
 
+        this.leftDown = false;
+        this.rightDown = false;
+
 
         this.solverForm.addEventListener(
             "submit",
@@ -57,7 +60,18 @@ class Game {
         );
         this.canvas.addEventListener(
             "mousedown",
-            event => event.preventDefault()
+            event => {
+                event.preventDefault()
+
+                switch (event.button) {
+                    case 0:
+                        this.leftDown = true;
+                        break;
+                    case 2:
+                        this.rightDown = true;
+                        break;
+                }
+            }
         );
         this.canvas.addEventListener(
             "mouseup",
@@ -67,13 +81,23 @@ class Game {
                 const square = this.display.posToSquare({x: event.clientX, y: event.clientY});
                 switch (event.button) {
                     case 0:
-                        square.uncover();
+                        if (this.leftDown && this.rightDown)
+                            square.chord();
+                        else
+                            square.uncover();
+
+                        this.leftDown = false;
                         break;
                     case 1:
                         square.chord();
                         break;
                     case 2:
-                        square.flag();
+                        if (this.leftDown && this.rightDown)
+                            square.chord();
+                        else
+                            square.flag();
+
+                        this.rightDown = false;
                         break;
                 }