Hot answers tagged

7

the rule is to make a square or rectangle in which each color is the same color with the other guy to move. I'm not quite sure how this sentence makes sense other than there is a typo, and it actually says "...rectangle in which each corner is the same color with the other guy to move". If this is indeed the case, then obviously b4-d4-d8-b8 works ...


3

There is a crucial part missing from the definition. To have the opposition you must have an odd number of squares between the kings when it is your opponent's turn to move. This is obvious when you think about it. Suppose you move your king to be diagonally opposite your opponent's king on a square of side 4. The two kings are on the same diagonal and so on ...


1

I can't speak on the usefulness of ECO for serious study. However, I can tell you that https://www.openingtree.com/ (which is not a printed reference, but is relevant to the title) is much easier than a book to search: just play the moves, and the most common lines with white/draw/black percentages are displayed. You can search by Lichess players, chess.com ...


Only top voted, non community-wiki answers of a minimum length are eligible