you have the _horizon effect_. You do something, but the repercussions are too far in the future to see what the effect will be. This can cause the machine (or

you have the _horizon effect_. You do something, but the repercussions are too far in the future to see what the effect will be. This can cause the machine (or human) to do bad things. For example, trying to postpone the inevitable loss of a Queen which is at the edge of the horizon by giving up a pawn: this "wins" 2 tempi, pushing the loss of the queen behind the horizon. the game moves on, the machine sees the loss of the Queen and this time can give up a Knight to push it behind of the horizon... you get the idea. There's also the positive horizon effect: you do the right thing, but for the wrong reason fe because there's a refutation that you didn't see. However, the refutation is wrong, and a few forced moves later you do spot why.