3

It is rarely seen at top level nowadays, but in the times of Fischer and Kasparov vs. Karpov matches, it was a very popular opening for Black.

I heard that Kramnik made Kasparov stop playing KID and that the Bayonet attack is one of the main reasons that KID is not played so often anymore.

Is the KID considered to be unsound at the top level today? What are the key games that caused this shift in popularity of the KID?

2

Actually the King's Indian has seen a recent rise in popularity. For a few years now, players like Nakamura and Radjabov have revitalised the opening. And if you take a look at the very recent top level games it is striking how many top players gave it a try: Nakamura, Jobava, Grischuk, Giri, Radjabov, Kasimdzhanov, Bacrot and quite consistently Ding Liren, just to name a few.

Those are all games from 2015 and the list reads like a who's who in top level chess. So there certainly is no big theoretical issue, that would dissuade black from playing the King's Indian.

One of the hottest lines right now is the 6.h3 line (white's choice in most of the games I linked), apparently Aronian introduced some tricky ideas for white in this variation (according to Seirawan).

I have heard this Kramnik-Bayonet-story before, but I'm not sure how close it is to the truth. Kasparov himself said, that he stopped playing the King's Indian because it became too much work to keep up with two ultra-sharp black defences (The other being the Najdorf). A few years ago the Bayonet-variation was still widely played (Nakamura scored some impressive wins against it), but for now the focus seems to have shifted to 6.h3.

1

The King's Indian is very non-symmetric agressiv opening. It was popularized by player like Kasparov or Fischer always looking for big complication even with Black.

In today's chess, players with black are more looking for very solid opening play and try to win a long run game. But still many top level grandmaster are playing it like Nakamura, Giri, Ding Liren, Bacrot, Vachier-Lagrave ... Of course most of the time to avoid preparation they have other weapons than King's Indian like Grunfeld, Benoni or Dutch.

Also the KID doesn't seem unsound as "Quality Chess", which is an editor reknowned for the quality of the books they publish, is publishing a series by GM Vassilios Kotronias on the King's Indian.

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