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Amateurs frequently have the idea that a master can overwhelm them with a few swift blows. How often one hears at a simultaneous exhibition: “Oh, he’ll mate me in five or six moves.”
Such is not usually the case. As a matter of fact, the master sometimes requires more moves to down an amateur than to win from another master, even though the amateurs positon may be clearly inferior or even lost early in the game. This is partly because a master resigns when his position becomes untenable, whereas many amateurs play on until they are mated.
There are, however, types of games in which the master does mate the amateur very rapidly. In many such instances, the master is able to open lines and to develop a perponderance of pieces early in the game because of the faulty play of the amateur. The mating pattern also plays its part in these rapid mates.
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— Max Euwe
Max Euwe was the 5th World Chess Champion.