Does anything interesting happen when top chess programs play against each other?
One interesting observation is that games between powerful computers are drawn significantly less often than between grandmasters. This seems to falsify the previously widespread belief that grandmasters draw games so often because of flawless play that leaves the opponent no chance for winning; rather, it seems like they miss important winning strategies.
Is work being done on humans using chess programs as aids during games?
Yes, it's called "advanced chess."
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Also see the introduction thread.