When I saw Svidler’s move, I had to think of the Spanish Inquisition and that it would make the perfect name for that whole line.
How can you spot Rg1 in such a position? Actually it’s very logical if you follow the “Algorithm”. The first cathegory when looking for candidate moves, is king’s safety. The black king is unsafe, because of the pawn on h6. The white rook-move exloits just that. Easy game! On the other hand, it turned out that there was no attack, so either castling or improving the pawn-structure with b4 or h3 would probably have been better. The most amazing thing is that Rg1 has been played before, by MVL against Giri in 2016.
Source: Monty Python on Youtube