user1120: Black to move:
[fen "4rbk1/pp3pp1/1nq4p/8/1PP5/P3N1P1/Q2BrP1P/3R1RK1 b - - 0 1"]

I've tried to solve this chess problem - black to move, find the best move. I couldn't work it out so I checked the solution, which was R8xe3. I don't understand why this is the best move - could someone explain please?

user1113: Ideally, what does Black wants to do? He wants to put the Queen on g2. But that square is protected by the Knight on e3. The knight must be removed. If the pawn is recaptured then it will be mate. If the bishop recapture, the Queen will get captured. So, black is up material.

user167: 1...R8xe3 wins a piece (the knight on e3), because either recapture leads to worse things for White, since the d2 bishop is pinned to the white queen, and the f-pawn recapture opens the possibility of mate on g2:
[fen "4rbk1/pp3pp1/1nq4p/8/1PP5/P3N1P1/Q2BrP1P/3R1RK1 b - - 0 1"]

1...R8xe3 2.Bxe3 (2.fxe3 Qg2#) Rxa2 


1120: <p>Black to move:</p>

<pre><code>[fen "4rbk1/pp3pp1/1nq4p/8/1PP5/P3N1P1/Q2BrP1P/3R1RK1 b - - 0 1"]
</code></pre>

<p>I've tried to solve this chess problem - black to move, find the best move. I couldn't work it out so I checked the solution, which was R8xe3. I don't understand why this is the best move - could someone explain please?</p>
 1113: <p>Ideally, what does Black wants to do? He wants to put the Queen on g2. But that square is protected by the Knight on e3. The knight must be removed. If the pawn is recaptured then it will be mate. If the bishop recapture, the Queen will get captured. So, black is up material.</p>
 167: <p><code>1...R8xe3</code> wins a piece (the knight on e3), because either recapture leads to worse things for White, since the d2 bishop is pinned to the white queen, and the f-pawn recapture opens the possibility of mate on g2:</p>

<pre><code>[fen "4rbk1/pp3pp1/1nq4p/8/1PP5/P3N1P1/Q2BrP1P/3R1RK1 b - - 0 1"]

1...R8xe3 2.Bxe3 (2.fxe3 Qg2#) Rxa2 
</code></pre>
