@SFRuminations

MASTERPLAY by William F. Wu is an entertaining book with an unlikely premise. Sadly way out of print.

In the future, lawsuits take decades to resolve due to proliferation and complexity.
If both plaintiff and defendant agree, they can speed things up by having the winner determined by the outcome of a historical computer wagame.

Each side hires a player from the wargamer's guild to play a famous historical battle, winner take all.