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what is the difference?
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Enumerate all does just what it says. It enumerates every single board for every hand in the specified ranges and calculates how often each range wins or ties. When you have 2 random hands and 5 cards to come, it is a coin flip whether or not pigs will learn to fly before your simulation finishes.
Monte Carlo uses a "shortcut" to come up with the same numbers and it's very accurate and much faster.
Monte Carlo Simulations