The same is true of the strike zone, there is a definition in the rule book but the game has evolved in such a way that the strike zone is really up to the interpretation of the umpire. If you change that by having a robot enforce the rulebook you are changing the way baseball has been played for 100+ years and I dont like that or think it is necesary. Can we let the 'game has been the same way for 100+ years' stuff go? The game has changed many times, and in many ways. I do want to underscore, however, that I agree with the rest of your point here. Maybe they wanted umpires to have be so in charge of the game that they could interpret some rules, you cant say the only reason there are umpires today is because they didnt have computers in 1876. Absolutely. You are assuming that every time some robot could make a call but doesnt it is some limitation of technology instead of an intended design of how the game is called and played. Not at all. I am saying that resisting technology because 'it wasn't around' & 'the game hasn't changed for __ years' is poor reasoning. I by no means -- as I stated -- am the 'robot ump lobbyist'. I think replay has been & will continue to be an invaluable addition to MLB. I also think that MLB should investigate (in great detail) all the ways in which adding something like what ATP (tennis) uses for borderline calls could/would help & hurt the game... not just resist it bc of some 'unwritten rules' interpretation. I would hope that if the idea seemed unlikely to be an overall positive, it would get scrapped. I would also hope, however, that if MLB felt it was a good idea, it would be instituted. I guess, to me, the 'integrity of the game' argument goes both ways. What about horrible, horrible calls that umps make? Aren't they insulting the integrity of the way baseball is meant to be played? Surely we don't simply have to settle for the status quo because some people don't like even the possibility of change.