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At the halfway mark in the 1969 World Championship between Petrosian and Spassky, the match score was level. Petrosian only needed to draw the match to retain his title, and with his super-solid Petroff it looked like he was going to wrap things up. But in game 17 and 19 Petrosian suddenly switched to Sicilian, losing calamitously. John Saunders retraces the course of the match that decided who would defend the title against Fischer three years later.

Mega database is easily the greatest database one can buy. Not only does it come with 8.4 million games, but over 85 thousand of them are annotated, many by world champions and the elite. It doesn't come free, though its asking price includes a full year of unparalleled updates, but what if you could have access to it without having to buy it?...

€29.90 We at ChessBase have seen it happen, time and time again. A high-rank player, or a serious amateur, will say: "I want it to ...", and they will express their wishes for the next version of our database program. But often the answer is: "It can do that – heres how!" A notable exception was Super-GM Fabiano Caruana, who asked for a number of genuinely new functions – which we have built into ChessBase 16. They move the user a big step forward in preparation and analy...