To pitch the perfect game, the pitcher does not allow any hits, walks, or hit batsmen. In short, "27 up, 27 down".

It is so difficult because the pitcher has to not only avoid throwing down the middle, but also avoid walking anyone.

There have 17 perfect games by modern definition. That's 1 approximately every 8 years or about 1 every 11,000 games. No pitcher has thrown more than one.

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