internal MovesCalculator(GameBoardState state, CheckerColor color, int fromPosition, List <int> moves)
{
initialMoveState = new MoveState(state, color, fromPosition, moves, new List <Change>());
//Initialises the set of reachable states given the starting GameBoardState, position and moves
IEnumerable <MoveState> tmp1 = initialMoveState.GenerateMoveStatesForPosition();
while (tmp1.Count() > 0)
{
reachableStates.AddRange(tmp1); //Adds all the states in tmp1 to the reachable states
tmp1 = tmp1
//Maps every state 'a' in tmp1 to a list that contains the states that are reachable from 'a'
.Select(s => s.GenerateMoveStatesForPosition())
//Concatenates all the lists, yielding a new set of reachable states
.Aggregate((a, b) => a.Concat(b));
}
}