Who is Michael Francis Stean? Why did he play 24. ... f5? instead of 24. ... Rf8? I can't understand this kind of moves...
any analysis for this line in the najdorf?
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It is hard to say weather this sac is completely sound or not, but it has been played many times before and is quite theoretical, so I would say white is probably getting enough compensation. You must learn the critical lines though if you are to play this with either colour. If I still played the Bg5 Najdorf as white, I would prefer 10.Bd3, preparing to bring the rook to e1 and threaten a thematic Nd5 sac. This slightly more restrained approach seems better IMO.
I saw this in a Tal game. Is the sacrifice sound?
I've been tempted to play this sac before but have resisted. Here's the Tal game in full;