yes and they r very important! Look at Ballpark effects. the computer uses a 20-sided die to determine whether a #hr or a >single is a homer or a hit. the higher the number rating the better chance for success. some parks have a #HR rating of 20, some zero. so any roll in the 20 park is a homer, any roll of 0, is an out. singles the same. lets say a park is rated 15, and the die rolls a 16 its and out, 15 or below a hit/HR. there r some variations based on the Hitter's cards concerning power and also sometimes HAL seems to have a mind of his own. good luck. P.S. when i started i made the same mistake