IT'S ALL IN THE NUMBERS
Way back in Chapter Two we learned that computers play chess by using a formula called an algorithm to assign a numerical evaluation to a
particular position. The engine looks ahead as far as it can, evaluating
millions of possible future positions, “backtracks” the numbers, and ultimately plays the one candidate move which leads to that best position.
What's even cooler is that the computer will show us what it's
thinking. Pretty dang near every chess program ever made
has some form of “analysis window” in which it will show the
user what moves it's pondering at any given moment. The
best way to illustrate how to read the info in a computer's
analysis window is by using a practical example (I'll be
running Houdini 2 in the Chess King program):
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chessking.com