user29820: Imagine that all White pieces are in their initial position and Black only has their king on e8. What is the smallest number of moves needed for White to give checkmate?

user17425: There seem to be many ways to mate in 6.  That is the best I found.  Here is one.
[FEN "4k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - 0 1"]

1.e4 Ke7 2.Qg4 Kd6 3.Qg7 Kc5 4.d4+ Kb4 5.Bd2+ Ka4 6.b3#


29820: <p>Imagine that all White pieces are in their initial position and Black only has their king on e8. What is the smallest number of moves needed for White to give checkmate?</p>
 17425: <p>There seem to be many ways to mate in 6.  That is the best I found.  Here is one.</p>
<pre><code>[FEN &quot;4k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - 0 1&quot;]

1.e4 Ke7 2.Qg4 Kd6 3.Qg7 Kc5 4.d4+ Kb4 5.Bd2+ Ka4 6.b3#
</code></pre>
