It was painful, but I did it...
One board showing the positions on the field, 9 red fielder's dice, 6 green batters dice, a pencil, a scorepad and one page of rules, pawns to show the position of players on the field, the outs, runs for that inning, balls and strikes.
The pitcher rolls his die to determine the type of pitch it is. As an example you roll the pitcher die and gets a 4 (a sinker). The batter rolls his #4 die to determine what happens. The 4 batting die has as results 2 strikes, 2 balls, a ground ball and a single. If you rolled the single result you would put a pawn on first. Now you have a new batter and the pitcher rolls his die and gets a 3 (curve ball). The batting player now rolls his 3 die and gets the result (2 balls, 2 strikes, ground ball centre fielder, or fly ball right fielder). The batter rolls a fly ball right fielder, and his means the fielding player rolls his right fielder die. On the right fielder die there are only 2 results, 5 catch results and 1 error. Yes, this means that a fielder will error 1/6th of the time...
If you hit a ball to the infield you get a Safe or Out result.
Another example, let's go back to the 2nd batter and instead he hits a ground ball centre fielder and he rolls a catch. The fielding player then rolls the first baseman dice and gets either a safe result (1 in 3 times) or an out result (2 in 3).
There is no more to this game, all you do is roll dice and look at the results.
If you want to do nothing but roll dice, get a big bucket o dice and roll them, it will mean as much. If you want to add strategy, play a different game.