Najdorf game Duda Vs Idani in World Cup, Sochi

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Avatar of BharatArora23

Hi

I saw this game

https://www.chess.com/events/2021-fide-world-cup/04-01/Duda_Jan_Krzysztof-Idani_Pouya

English attack, mainline( i guess).Maybe a revision perhaps.

What is the significance of move 21. Kb1?  I have seen this move in dragon lines as well.. Thanks..

Bharat

Avatar of JosephReidNZ

Good to know.