Novelty of the Week – TWIC 1642

The Novelty of the Week from TWIC 1642 comes from the game between Tornike Sanikidze and Stamatis Kourkoulos Arditis.

The move in question is the intriguing: 7.Na3!?
At first glance, this might look like a sideline, but it carries a surprisingly deep idea.

A natural question arises: What's the difference between 7.Na3 and the more standard 7.0-0 followed by 8.Na3? Do these lines simply transpose, or is there something more subtle going on?

In some cases, the lines do transpose:
7.Na3 b4 8.Nc4 a5 9.0-0 0-0
7.Na3 a6 8.c4 bxc4 9.Nxc4 0-0 10.0-0

However, the real point of 7.Na3 appears in the line: 7.Na3 a6 8.c4 b4
Here, White deliberately delays castling, and that changes everything.
Compare this with: 7.0-0 0-0 8.Na3 a6 9.c4 b4
In this version, Black equalizes quite comfortably.

However, after 7.Na3 a6 8.c4 b4 White can play for an advantage after 9.Nc2 a5 10.a3 Na6 11.d5 c6 12.e4!
Here we can see the difference: Black cannot take the pawn with Nxe4 as Bg7 is unprotected. If both sides had already castled, this tactical detail would disappear.

Interestingly, this critical line did not occur in the game and instead Black chose 7...b4 8.Nc4 a5.

Even though the full idea didn't appear on the board, 7.Na3!? is a highly instructive novelty: it invites a transposition, but it hides a deep tactical justification.
A great find by GM Tornike Sanikidze and a perfect illustration of how move order subtleties can make all the difference.