✅ What is the best way to fix StackOverflow when methods are calling each other?

        public List<int> AllPossiblitiesOfPlayer(int player, Board b) 
        {
            List<int> allMoves = new List<int>(), playerPositions = player == 0 ? whitePositions : blackPositions; ;
            for (int i = 0; i < playerPositions.Count; i++)
            {
                List<int> possibles = new Find(playerPositions[i], board[playerPositions[i]].piece, player, this).FindMoves();
                for (int j = 0; j < possibles.Count; j++)
                {
                    if (!RemovesCheck(i, possibles[j], player, b))
                    {
                        possibles.RemoveAt(j);
                    }
                }
                allMoves.Concat(possibles).ToList();
            }
            return allMoves;
        }
        public int Stalemate(Board b, int player) 
        {
            if (AllPossiblitiesOfPlayer(player, b).Count() == 0)
                return player;
            else return -1;
        }
        public int Checkmate(Board b, int player) 
        {
            if (Stalemate(b, player) == player && Check(player, b))
                return player == 0 ? 1 : player;
            return -1;
        }
        public bool Check(int player, Board b) 
        {
            return AllPossiblitiesOfPlayer(player == 0 ? 1 : player, b).Contains(FindKingPos(player, b));
        }
        public bool RemovesCheck(int source, int dest, int player, Board b) 
        {
            var copy = b.Clone(b);
            Move(source, dest, player, copy);
            return !Check(player, copy);
        }

        public List<int> AllPossiblitiesOfPlayer(int player, Board b) 
        {
            List<int> allMoves = new List<int>(), playerPositions = player == 0 ? whitePositions : blackPositions; ;
            for (int i = 0; i < playerPositions.Count; i++)
            {
                List<int> possibles = new Find(playerPositions[i], board[playerPositions[i]].piece, player, this).FindMoves();
                for (int j = 0; j < possibles.Count; j++)
                {
                    if (!RemovesCheck(i, possibles[j], player, b))
                    {
                        possibles.RemoveAt(j);
                    }
                }
                allMoves.Concat(possibles).ToList();
            }
            return allMoves;
        }
        public int Stalemate(Board b, int player) 
        {
            if (AllPossiblitiesOfPlayer(player, b).Count() == 0)
                return player;
            else return -1;
        }
        public int Checkmate(Board b, int player) 
        {
            if (Stalemate(b, player) == player && Check(player, b))
                return player == 0 ? 1 : player;
            return -1;
        }
        public bool Check(int player, Board b) 
        {
            return AllPossiblitiesOfPlayer(player == 0 ? 1 : player, b).Contains(FindKingPos(player, b));
        }
        public bool RemovesCheck(int source, int dest, int player, Board b) 
        {
            var copy = b.Clone(b);
            Move(source, dest, player, copy);
            return !Check(player, copy);
        }