user30167: I'm trying to learn some theory about the Petroff and was reading about the 3.d4 d5 sideline. Eventually, the position below is reached.
[FEN ""]
1.e4 e5 2.Nf3 Nf6 3.d4 d5 4.exd5 exd4 5.Qxd4 Qxd5 6.Qe3+ Qe6 7.Bb5+ Nc6 8.Bxc6+ bxc6 9.Nc3

What I can't wrap my head around is that Stockfish says that this position is completely equal. Why is that? From my perspective, White looks objectively better here - they are ready to castle and have developed an extra knight, while Black is behind on development and has serious damage to their queenside pawn structure. What's Black's advantage here? What do they have to counter all White's advantages?
Edit: Sorry, I jumped the gun a bit - Stockfish actually evaluates this position as -.07 at depth 22, which feels somehow more baffling to me.

user4418: 
What I can't wrap my head around is that Stockfish says that this position is completely equal. Why is that?

Black has the bishop pair in a completely open position (no center pawns). This advantage plus the extra open b file, which black is ready to exploit with Rb8, compensates for the doubled isolated pawns.

30167: <p>I'm trying to learn some theory about the Petroff and was reading about the 3.d4 d5 sideline. Eventually, the position below is reached.</p>
<pre><code>[FEN &quot;&quot;]
1.e4 e5 2.Nf3 Nf6 3.d4 d5 4.exd5 exd4 5.Qxd4 Qxd5 6.Qe3+ Qe6 7.Bb5+ Nc6 8.Bxc6+ bxc6 9.Nc3
</code></pre>
<p>What I can't wrap my head around is that Stockfish says that this position is completely equal. Why is that? From my perspective, White looks objectively better here - they are ready to castle and have developed an extra knight, while Black is behind on development and has serious damage to their queenside pawn structure. What's Black's advantage here? What do they have to counter all White's advantages?</p>
<p>Edit: Sorry, I jumped the gun a bit - Stockfish actually evaluates this position as <em>-.07</em> at depth 22, which feels somehow more baffling to me.</p>
 4418: <blockquote>
<p>What I can't wrap my head around is that Stockfish says that this position is completely equal. Why is that?</p>
</blockquote>
<p>Black has the bishop pair in a completely open position (no center pawns). This advantage plus the extra open b file, which black is ready to exploit with Rb8, compensates for the doubled isolated pawns.</p>
