Python

Trying to modify this part of a checkers game code so that it evaluates past moves before calculating available moves. Any sort of help would be appreciated.

#+-added to calculate all the available valid moves def movesAvailable(s): moves=[] for j in range(8): for i in range(8): X1,Y1 = [i-1,i+1],[j-1,j+1] for a in range(2): for b in range(2): if 0<=X1[a]<8 and 0<=Y1[b]<8: if s.moveIsValid(i,j,X1[a],Y1[b]): moves.append([i,j,X1[a],Y1[b]]) return moves