I have detected a difficult to see error in Fifa 99 and Fifa 2000. When two players play against, if one uses the keyboard and the other uses a gamepad ( as sidewinder pad), the team controlled by the pad anticipates the other team players , recovers the ball and tackles too much easly than the team controlled by the keyboard. This makes a big difference in the game and it really happens (Try it).
I would like to know if anybody else has detected the same problem
or if someone knows why it happens or something related to.

dude what's wrong with you? the game itself is a BUG.