>For one, it's not the case that overall white and black win 50% of the time each.
He addresses that (first-move advantage from white moving first) in the parenthesis after that same sentence:
"After extensive experimentation, they realize this: 50% of the time, the white player wins and 50% of the time, the black player wins (we'll ignore draws and any first-move advantage for the example). "
He addresses that (first-move advantage from white moving first) in the parenthesis after that same sentence:
"After extensive experimentation, they realize this: 50% of the time, the white player wins and 50% of the time, the black player wins (we'll ignore draws and any first-move advantage for the example). "