user11891: In the last few years, the Petroff defense had almost disappeared from the super-grandmaster scene with Top players preferring to play the Berlin. However, in this year itself, the Petroff has seen some sort of a renaissance with Fabiano Caruana in particular playing it 4 times in the Candidates tournament itself. Top players like Nakamura have also played it a few times recently(particularly the US Championship) 
My question is, Why is the Petroff being played more recently? Has there been any novelty that has been uncovered and everyone's just analyzing it more and more?

user12873: Nowadays theory has become so convoluted at the super-GM level that top players want to avoid the main lines more and more. The petroff is a good option, since it hasn't been analyzed and played by super-GMs to such a huge extent. In addition, there's nothing fundamentally wrong with the Petroff (objectively, it may just be slightly worse than 2...Nc6).
By the way, the fact that Caruana played the Petroff 4 times in the Candidates doesn't necessarily signify a resurgence of the opening. He probably just prepared it specifically for that tournament, and the same goes for Nakamura in the US championship.

user4362: Possibly it's the evasion of the evasion of the evasion.
GMs evade the Ruy mainlines by playing the Berlin, then they evade the Berlin by playing the Italian and now they might just start to evade the Italian by playing the Petroff. 
My hope is that they'll evade the Petroff by playing the King's Gambit. 

11891: <p>In the last few years, the Petroff defense had almost disappeared from the super-grandmaster scene with Top players preferring to play the Berlin. However, in this year itself, the Petroff has seen some sort of a renaissance with Fabiano Caruana in particular playing it 4 times in the Candidates tournament itself. Top players like Nakamura have also played it a few times recently(particularly the US Championship) </p>

<p>My question is, <strong>Why is the Petroff being played more recently?</strong> Has there been any novelty that has been uncovered and everyone's just analyzing it more and more?</p>
 12873: <p>Nowadays theory has become so convoluted at the super-GM level that top players want to avoid the main lines more and more. The petroff is a good option, since it hasn't been analyzed and played by super-GMs to such a huge extent. In addition, there's nothing fundamentally wrong with the Petroff (objectively, it may just be <em>slightly</em> worse than 2...Nc6).</p>

<p>By the way, the fact that Caruana played the Petroff 4 times in the Candidates doesn't necessarily signify a resurgence of the opening. He probably just prepared it specifically for that tournament, and the same goes for Nakamura in the US championship.</p>
 4362: <p>Possibly it's the evasion of the evasion of the evasion.</p>

<p>GMs evade the Ruy mainlines by playing the Berlin, then they evade the Berlin by playing the Italian and now they might just start to evade the Italian by playing the Petroff. </p>

<p>My hope is that they'll evade the Petroff by playing the King's Gambit. </p>
