user917: Today I was solving a chess problem as following picture : 
[fen "r1bqr1k1/1p3nbp/2pp2p1/2n2P2/p1PN1P2/2N1B1PP/PPQ3B1/R3R1K1 b - - 0 1"]

The solution given was 1...Rxe3, but I did not get the actual benefit of this solution. Can anyone explain this?

user167: The point is that after 1...Rxe3 Black will be winning material, as the sole defender of the white knight has been removed, and a pin tactic is coming. Specifically, after 2.Rxe3 (anything other than this recapture means Black has just won a piece for nothing) and 2...Bxd4, White has no way to stop the follow-up 3...Bxe3+ since the rook is pinned to the king, and so Black has netted an extra piece anyway.
[FEN "r1bqr1k1/1p3nbp/2pp2p1/2n2P2/p1PN1P2/2N1B1PP/PPQ3B1/R3R1K1 b - - 0 1"]

1...Rxe3 2.Rxe3 Bxd4 *


917: <p>Today I was solving a chess problem as following picture : </p>

<pre><code>[fen "r1bqr1k1/1p3nbp/2pp2p1/2n2P2/p1PN1P2/2N1B1PP/PPQ3B1/R3R1K1 b - - 0 1"]
</code></pre>

<p>The solution given was <code>1...Rxe3</code>, but I did not get the actual benefit of this solution. Can anyone explain this?</p>
 167: <p>The point is that after <code>1...Rxe3</code> Black will be winning material, as the sole defender of the white knight has been removed, and a pin tactic is coming. Specifically, after <code>2.Rxe3</code> (anything other than this recapture means Black has just won a piece for nothing) and <code>2...Bxd4</code>, White has no way to stop the follow-up <code>3...Bxe3+</code> since the rook is pinned to the king, and so Black has netted an extra piece anyway.</p>

<pre><code>[FEN "r1bqr1k1/1p3nbp/2pp2p1/2n2P2/p1PN1P2/2N1B1PP/PPQ3B1/R3R1K1 b - - 0 1"]

1...Rxe3 2.Rxe3 Bxd4 *
</code></pre>
