<story><title>The number of legal chess positions estimated at 4.5x10^44 – proof games wanted</title><url>https://github.com/tromp/ChessPositionRanking</url></story><parent_chain></parent_chain><comment><author>Fang_</author><text>&amp;gt; Black to move, and in the final position, the pawn at h4 can be captured en-passant.&lt;p&gt;&amp;gt; They&amp;#x27;re all legal.&lt;p&gt;But then, looking at the final position[1], black is in check by the knight on b2. If white&amp;#x27;s pawn can be captured en passant, this implies the knight was not the most recent move, so the black king was in check on the previous turn as well.&lt;p&gt;It&amp;#x27;s obviously not legal to remain in check. What am I missing?&lt;p&gt;[1] &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;raw.githubusercontent.com&amp;#x2F;tromp&amp;#x2F;ChessPositionRanking&amp;#x2F;72608cf14906b989753024810fc642142605cca5&amp;#x2F;img&amp;#x2F;8686186724060380137654941364776065067846290128.png&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;raw.githubusercontent.com&amp;#x2F;tromp&amp;#x2F;ChessPositionRanking...&lt;/a&gt;</text></comment>
<story><title>The number of legal chess positions estimated at 4.5x10^44 – proof games wanted</title><url>https://github.com/tromp/ChessPositionRanking</url></story><parent_chain></parent_chain><comment><author>TheDudeMan</author><text>This is pretty interesting, too.  Linked in the README:&lt;p&gt;Number of legal Go positions
&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;tromp.github.io&amp;#x2F;go&amp;#x2F;legal.html&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;tromp.github.io&amp;#x2F;go&amp;#x2F;legal.html&lt;/a&gt;</text></comment>