user19717: [FEN "2r1r1k1/5ppp/8/8/Q7/8/5PPP/4R1K1 w - - 0 1"]

The important square of e8 square is hanging. It is hanging because if white can take that square it's checkmate. Is this a hanging square tactic?
If the rook on Rook on c8 is deflected from the  protection of e8, is it called a deflection tactic?
[FEN "6k1/3qb1pp/4p3/ppp1P3/8/2PP1Q2/PP4PP/5RK1 w - - 0 1"]

Here, the important f8 square is not hanging, so white plays Qf7+ to deflect the king from protection of f8 square, thus leading to checkmate.

user12873: I haven't heard of the term "hanging square" before. But you're right that the c8-rook would be deflected (or "attracted") if it were taken away from defending the rook on e8.

19717: <pre><code>[FEN "2r1r1k1/5ppp/8/8/Q7/8/5PPP/4R1K1 w - - 0 1"]
</code></pre>

<p>The important square of e8 square is hanging. It is hanging because if white can take that square it's checkmate. Is this a hanging square tactic?</p>

<p>If the rook on Rook on c8 is deflected from the  protection of e8, is it called a deflection tactic?</p>

<pre><code>[FEN "6k1/3qb1pp/4p3/ppp1P3/8/2PP1Q2/PP4PP/5RK1 w - - 0 1"]
</code></pre>

<p>Here, the important f8 square is not hanging, so white plays Qf7+ to deflect the king from protection of f8 square, thus leading to checkmate.</p>
 12873: <p>I haven't heard of the term "hanging square" before. But you're right that the c8-rook would be deflected (or "attracted") if it were taken away from defending the rook on e8.</p>
