user16483: This time an easy puzzle I made up today. White mates in three.
[FEN "7k/4Kp2/P4Np1/6R1/8/R6P/8/8 w - - 1 0"]


user14079: Herb's solution works perfectly, but since you indicated in a comment that you were expecting for another one, maybe that's it.
[fen "7k/4Kp2/P4Np1/6R1/8/R6P/8/8 w - - 1 0"]

1. Rag3 Kg7
2. Rh5 g5
3. Rgxg5#


Edit:
Here is a simple suggestion to fix the cook and make this solution the only one:
[fen "7k/4Kp2/P4Np1/6R1/7P/R7/8/8 w - - 1 0"]

1. Rag3 (1.Rh5? gxh5 2.Rg3? {stalemate}) (1.h5 Kg7) Kg7
2. Rh5 g5
3. Rgxg5#


user9025: [fen "7k/4Kp2/P4Np1/6R1/8/R6P/8/8 w - - 1 0"]

1. Rh5+ gxh5 {if Kg7, Rh7#}
2. Rg3  h4
3. Rg8#


16483: <p>This time an easy puzzle I made up today. White mates in three.</p>

<pre><code>[FEN "7k/4Kp2/P4Np1/6R1/8/R6P/8/8 w - - 1 0"]
</code></pre>
 14079: <p>Herb's solution works perfectly, but since you indicated in a comment that you were expecting for another one, maybe that's it.</p>
<pre><code>[fen &quot;7k/4Kp2/P4Np1/6R1/8/R6P/8/8 w - - 1 0&quot;]

1. Rag3 Kg7
2. Rh5 g5
3. Rgxg5#
</code></pre>
<hr />
<p><strong>Edit</strong>:</p>
<p>Here is a simple suggestion to fix the cook and make this solution the only one:</p>
<pre><code>[fen &quot;7k/4Kp2/P4Np1/6R1/7P/R7/8/8 w - - 1 0&quot;]

1. Rag3 (1.Rh5? gxh5 2.Rg3? {stalemate}) (1.h5 Kg7) Kg7
2. Rh5 g5
3. Rgxg5#
</code></pre>
 9025: <pre><code>[fen "7k/4Kp2/P4Np1/6R1/8/R6P/8/8 w - - 1 0"]

1. Rh5+ gxh5 {if Kg7, Rh7#}
2. Rg3  h4
3. Rg8#
</code></pre>
