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diff --git a/resources/bitboards.html b/resources/bitboards.html
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+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Bitboard editor</title>
+  <style>
+    :root {
+      --square-side-length: 6rem;
+      --dark-color: #779556;
+      --light-color: #ebecd0;
+      --selected-color: #f37f6b;
+      --background-color: #0f0f0f;
+      --text-color: #fefefe;
+    }
+    body {
+      display: flex;
+      flex-direction: column;
+      align-items: center;
+      background-color: var(--background-color);
+      color: var(--text-color);
+    }
+    #board {
+      display: grid;
+      grid-template-columns: repeat(9, 1fr);
+      grid-template-rows: repeat(9, 1fr);
+    }
+    .dark {
+      background-color: var(--dark-color);
+    }
+    .light {
+      background-color: var(--light-color);
+    }
+    .selected {
+      background-color: var(--selected-color);
+    }
+    .square {
+      width: var(--square-side-length);
+      height: var(--square-side-length);
+    }
+    .label {
+      width: var(--square-side-length);
+      height: var(--square-side-length);
+      display: flex;
+      align-items: center;
+      justify-content: flex-end;
+    }
+    .horizontal_label {
+      width: var(--square-side-length);
+      height: var(--square-side-length);
+      display: flex;
+      justify-content: center;
+    }
+  </style>
+</head>
+<body>
+  <div id="board">
+  </div>
+  <div id="output">
+  </div>
+  <script>
+    const output = document.getElementById("output");
+
+    let bitboard = 0n;
+    function trackBitboard(i, selected) {
+      const mask = 1n << BigInt(i);
+      if (selected) {
+        bitboard |= mask;
+      } else {
+        bitboard &= ~mask;
+      }
+      output.textContent = bitboard.toString();
+    }
+
+    const selectedAction = trackBitboard;
+
+    const board = document.getElementById("board");
+    for (let i = 0; i < 64; i++) {
+      if (i % 8 == 0) {
+        const label = document.createElement("div");
+        label.classList.add("label");
+        label.textContent = 8 - Math.round(i / 8);
+        board.appendChild(label);
+      }
+      const square = document.createElement("div");
+      square.classList.add("square");
+      const shift = Math.floor(i / 8);
+      square.classList.add((i + shift) % 2 ? "dark" : "light");
+      square.onclick = () => {
+        const selected = square.classList.contains("selected");
+        selectedAction((i % 8) - 8 * Math.floor(i / 8) + 56, !selected);
+        if (selected) {
+          square.classList.remove("selected");
+        } else {
+          square.classList.add("selected");
+        }
+      };
+      board.appendChild(square);
+    }
+    const label = document.createElement("div");
+    label.classList.add("horizontal_label");
+    board.appendChild(label);
+    for (let i = 0; i < 8; i++)  {
+      const label = document.createElement("div");
+      label.classList.add("horizontal_label");
+      label.textContent = ["a", "b", "c", "d", "e", "f", "g", "h"][i];
+      board.appendChild(label);
+    }
+  </script>
+</body>
+</html>