The only way you can force them is by limiting the number of moves they can make. When you are playing someone who has mastered the simpler parts of the game I described above, they will only make moves that allow you to get a corner if they are forced to.
First, to review the already mentioned concepts: There are several important concepts that drive Reversi strategy. If you haven't already mastered all of the above, be sure to do so before trying to grasp the more complex and conceptual material to follow. Many people figure out everything I've written so far after 20-50 games. The only easy way to do this is if they have previously placed a piece adjacent to a corner along that same side. This is what I meant earlier about turning a corner against someone. You can see that white can now take the other corner at any time, and irreversibly control the entire side except the corner on the left. Even if you do get that other corner, your opponent can use that other corner against you, like so (you are black, "controlling" the side with 5 blacks, then you get the corner coming in from another direction): _ _ B B B B B _ A second, more subtle reason: If your opponent gets a corner on the other side of that row you control, their next move will be to get the corner you're adjacent to. One is that if the opponent does get that corner by other means, he'll then get the entire row you (thought) you controlled. But unless forced to go adjacent to a corner like this, it's better to avoid it, for 2 reasons. And it may be that for many turns thereafter it will not enable the opponent to get a corner. It can be thought of as less risky to go adjacent to a corner horizontally or vertically if you have control of that side. The turn after that, your opponent gets the corner.
Even if the opponent can't immediately seize the corner after that move, it usually takes a turn or two to find a way to get the color flipped along that diagonal in a way that can't be re-flipped on your turn. The worst move that you can make in Othello is to play a piece diagonally adjacent to a corner.
It's easier to think about avoiding bad moves than making good moves. At the same time, you want to minimize the chances of your opponent gaining the first corner. Key concept all beginners must grasp: All moves prior to the first corner being taken must be geared toward maximizing your chances of being the first to get a corner (or in rare instances, setting up the board to turn your opponent's first corner to your advantage).
None of the pieces can be re-flipped, and eventually your opponent will have so few (or zero) moves that you can control the rest of the game in any way you like. Once you do have a corner, if it's early enough in the game you can simply flip pieces to your color as close as possible to the corner, expanding gradually away from the corner and not doing any other types of moves. More importantly, it is an anchor for getting many more pieces that will never change color. Once you get a corner, it will never change color. I'll start with simple stuff first:Ĭorners are vital. So the approaches I've learned can get you from beginner to intermediate. I am not speaking as a highly expert player, but rather someone who always wins against people with little or no experience, and against overly simplistic computerized versions.
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