http://anydice.com/

http://dreamersanddicepools.blogspot.nl/2013/01/game-design-case-study-vampire_24.html

function: ROLL:s opposed by OPP:s {  result: ROLL - [highest of 0 and OPP]  }
function: N:n diff D:n {  result: Nd{-1,0:D-2,1:11-D}  }

Doorrekenen van D diff D:

function: ROLL:s opposed by OPP:s {  result: ROLL - [highest of 0 and OPP]  }
function: N:n diff D:n {  result: Nd{-1,0:D-2,1:11-D}  }

loop D over {2..10} {
  output [D diff D] named "Auto [D]"
}

(http://anydice.com/program/53e1/at_least/graph)

function: ROLL:s opposed by OPP:s {  result: ROLL - [highest of 0 and OPP]  }
function: N:n diff D:n {  result: Nd{0,0:D-2,1:11-D}  }

\ Noob \
output [3 diff 7] named "Three Die"

\ Alastar \
output [5 diff 7] named "Alastar"

\ EM \
output [9 diff 7] named "Elisabeth-Maria"

(http://anydice.com/program/5342)

function: ROLL:s opposed by OPP:s {  result: ROLL - [highest of 0 and OPP]  }
function: N:n diff D:n {  result: Nd{0,0:D-2,1:11-D}  }
function: N:n diff D:n specialty {  result: Nd{0:100,0:100*(D-2),1:100*(10-D), 1:10,1:10*(D-2),2:10*(10-D), 2,2:D-2,3:11-D}  }

output [5 diff 7] named "Normal"
output [5 diff 7 specialty] named "Specialty"

(http://anydice.com/program/6144)

Speciality dice is implemented by scaling normal faces and adding 'Boom!' faces.

function: botching N:n diff D:n {
  result: [botched [N botch D]]
}

function: N:n botch D:n {  result: Nd{-1,0:D-2,1:11-D}  }
function: botched R:s {
  result: ([count {1} in R] = 0) & ([count {-1} in R] > 0)
}

N: 3
D: 5

output [botching N diff D] named "[N] diff [D], botch"

(http://anydice.com/program/6284)

Outcomes of 1 indicate botch.