user16403: 
In this game white must win. Please help me. 

user825: The key move is the g3 move.

If the e3 rook is unpinned, black has lot's of troubles
If the b8 knight is under-protected, Qxb8 wins easily

1.g3 achieves both.
 1.g3 Qc7 2.Rxd7 now wins (Qxb8 or Rxe8 coming)

Black should resign.

16403: <p><img src="https://i.imgur.com/tSv5f3Z.png" alt="game"></p>

<p>In this game white must win. Please help me. </p>
 825: <p>The key move is the <strong>g3</strong> move.</p>

<ul>
<li>If the e3 rook is unpinned, black has lot's of troubles</li>
<li>If the b8 knight is under-protected, Qxb8 wins easily</li>
</ul>

<p>1.g3 achieves both.</p>

<pre><code> 1.g3 Qc7 2.Rxd7 now wins (Qxb8 or Rxe8 coming)
</code></pre>

<p>Black should resign.</p>
