The improvement of the Fritz engine is for the most part the result of implanting a huge amount of chess knowledge into the program. The new code allows this to be done with great efficiency. The program is so designed that additional knowledge will hardly slow it down at all – which ensures that it will not sacrifice tactical strength for general chess principles.
The properties of a chess position are largely determined by the pawn structure, and this is where Fritz has received much more generalised chess knowledge than its predecessor. Another touchy point is king safety. Unlike human beings chess programs tend to be oblivious to dangers looming against the king until these dangers are revealed in concrete variations which the program can calculate. This weakness is not immediately obvious when you play computers against each other, but when they encounter strong opponents it may spell their downfall.
Fritz has also been greatly improved in this area and can detect long-term threats against the king long before they appear in the search tree. This does not just lead to better defensive play, it also causes the program to sense potential dangers to the enemy king and lauch devastating attacks based on these weaknesses. So it becomes more and more difficult to play “anti-computer chess” against the program, while at the same time it has become an even more dangerous opponent for human players. more
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