I am an old cWod player who just bought Vampire V20. I was surprised to see that V20 kept the old dice system instead of using the new one.
As a reminder :
In oWoD, the Storyteller sets the difficulty for each roll depending on the circumstances, with the default being a difficulty of 6. A success is a roll of that difficulty or higher (6 or above, on most rolls). A roll of 1 is called a botch. If any number of 1's are rolled, they cancel out a single success. No more than one success can be cancelled out in this way, so critical failures (A botch with zero successes) are relatively rare. The net number of successes determines how well you succeed, with one success meaning that you are barely able and a greater number indicating better achievement. When you get zero net successes (if you get no successes or if your 1s cancel out your successes, or if you get at least one success and more ones than successes), you fail the roll. When you get zero successes and at least one 1, you botch-- a critical and spectacular failure. If you have a specialty in either your attribute or ability that is relevant on the roll, you may reroll all 10s to gain extra successes, and rolls of 1 on these rerolls do not count.
In nWoD, a success is an 8, 9, or 10, and 10s explode. A critical success is made when you get five or more successes. Instead of altering the target number of the roll, difficulty and circumstances increase or reduce the number of dice in the pool. When your dice pool is reduced to zero or less, you get a chance die. You roll the die normally, but only succeed on a ten (which still explodes) and if you get a one you get a critical failure. All other rolls are called simple failures.
Do you know if it is possible to play V20 with the new dice system ? I mean only replacing the dynamic difficulty system (which is statisticly flawed) by the fixed difficulty one (difficulty is expressed by adding or removing dices and not by changing the 7+ rule).