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Better Related Posts

{% assign hasSimilar = '' %}
{% for post in site.related_posts %}
  {% assign postHasSimilar = false %}
  {% for tag in post.tags %}
    {% for thisTag in page.tags %}
      {% if postHasSimilar == false and hasSimilar.size < 6 and post != page and tag == thisTag %}
        {% if hasSimilar.size == 0 %}
        <h4>Similar Posts</h4>
        <ul>
        {% endif %}
        <li class="relatedPost">
          <a href="{{ site.url }}{{ post.url }}">{{ post.title }}
          {% if post.series %}
            (Series: {{ post.series }})
          {% endif %}
          </a>
        </li>
        {% capture hasSimilar %}{{ hasSimilar }}*{% endcapture %}
        {% assign postHasSimilar = true %}
      {% endif %}
    {% endfor %}
  {% endfor %}
{% endfor %}
{% if hasSimilar.size > 0 %}
    </ul>
{% endif %}