Sun Tzu held spies in the highest regard, saying that they should be rewarded more liberally than any other relation in war because the foreknowledge they can provide is more valuable than any other commodity. When one knows where the enemy will strike, one doesn’t need to spread one’s forces thin protecting a dozen possible targets. When one knows when the enemy is unprepared, one can strike and be assured of victory. When one knows the habits of the enemy general, those habits can be turned against him. The use of spies to gain foreknowledge is like being able to see into the future.

Yomi

In competitive games, there is little more valuable than knowing the mind of the opponent, which the Japanese call yomi. All the complicated decisions in game theory go away if you know exactly what the opponent will do next. Sun Tzu says that reading minds is for the spirit world, and on that I cannot comment, but I have witnessed firsthand the ability of some players to “achieve things beyond the reach of ordinary men” through eerily powerful yomi. Perhaps these players are simply adept at “studying the details of the enemy,” but it seems to go far beyond that in some. There is one player whom I would even say has a supernatural ability to spy on the minds of others, knowing which moves they will next make – if it weren’t such an absurd thing to say. But believe me, those who have witnessed Japan’s fighting-game player Daigo Umehara do speak of these things in hushed tones, fancying that they may be true.