diff --git a/Board.cpp b/Board.cpp
index 6750ab2..6f30d40 100644
--- a/Board.cpp
+++ b/Board.cpp
@@ -1,4 +1,7 @@
+#include <ctime>
+#include <cstdlib>
 #include <iostream>
+#include <limits.h>
 #include <vector>
 #include "Board.h"
 
@@ -6,7 +9,7 @@ using namespace std;
 
 Board::Board() {
 	Piece* temp; 
-	bool valid = false;
+	
 	for (int i = 0; i < 2; ++i) {	
 		for (int j = 0; j < 8; ++j) {
 			temp = new Piece(i, j, 'X');
@@ -22,14 +25,15 @@ Board::Board() {
 			pieces.push_back(temp);
 		}
 	}
+	
+	valid, xtaken, otaken = false;
 }
 
 Board::Board(const Board& b) {
-	vector<Piece*> xp = b.getXPieces();
-	vector<Piece*> op = b.getOPieces();
+	vector<Piece*> xp = b.getTypePieces('X');
+	vector<Piece*> op = b.getTypePieces('O');
 	Piece* temp;
-	//bool valid = false;
-	char tempturn = b.getTurnPls();
+	char tempturn = b.getTurn();
 	turn = tempturn;
 	
 	for (int i = 0; i < xp.size(); ++i) {
@@ -43,6 +47,8 @@ Board::Board(const Board& b) {
 		opieces.push_back(temp);
 		pieces.push_back(temp);
 	}
+	
+	valid, xtaken, otaken = false;
 }
 
 //make this efficient!
@@ -74,6 +80,8 @@ void Board::isTaken(int r, int c) {
 				for(int x = 0; x < opieces.size(); ++x) {
 					if (opieces[x]->getX() == r && opieces[x]->getY() == c) {
 						opieces.erase(opieces.begin() + x);
+						cout << "otaken set to TRUE\n";
+						otaken = true;
 					}
 				}
 			}
@@ -81,6 +89,8 @@ void Board::isTaken(int r, int c) {
 				for(int x = 0; x < xpieces.size(); ++x) {
 					if (xpieces[x]->getX() == r && xpieces[x]->getY() == c) {
 						xpieces.erase(xpieces.begin() + x);
+						cout << "xtaken set to TRUE\n";
+						xtaken = true;
 					}
 				}
 			}
@@ -90,6 +100,30 @@ void Board::isTaken(int r, int c) {
 	}
 }
 
+bool Board::checkTaken(char c){
+	if (c == 'X'){
+		return xtaken;
+	}
+	
+	else if (c == 'O'){
+		return otaken;
+	}
+	
+	else
+		return false;
+}
+
+vector<Piece*> Board::getTypePieces(char type) const{
+	if (type == 'X')
+		return xpieces;
+	else if (type == 'O')
+		return opieces;
+	else{
+		cout << "Invalid type!\n";
+		return pieces;
+	}
+}
+
 moves Board::parse(string input){
 	input = myToUpper(input);
 	
@@ -136,20 +170,21 @@ bool Board::isGameOver(){
 	return false;
 }
 
-string Board::whoWon(){
+char Board::whoWon(){
 	for (int i = 0; i < xpieces.size(); ++i){
 		if (xpieces[i]->getX() == 7){
-			return "Player X wins!";
+			return 'X';
 		}
 	}
 	
 	for (int i = 0; i < opieces.size(); ++i){
 		if (opieces[i]->getX() == 0){
-			return "Player O wins!";
+			return 'O';
 		}
 	}
 	
-	return "ERROR: function whoWon() called incorrectly.";
+	cout << "ERROR: function whoWon() called incorrectly. Game is not over. \n";
+	return 'a';
 }
 
 void Board::changeTurns(){
@@ -157,6 +192,11 @@ void Board::changeTurns(){
 	else turn = 'O';
 }	
 
+void Board::resetTaken(){
+	xtaken = false;
+	otaken = false;
+}
+
 void Board::displayBoard(){
 	cout << ";    A B C D E F G H"<<endl;
 	for (int i = 0; i < 8; ++i) {
@@ -246,7 +286,6 @@ char Board::intToCharColumn(int input){
 
 void Board::move(string inputMove){
 	moves m = parse(inputMove);
-	//cout << "MOVE: " << m.row << " " << m.column << " " << m.moveType << "\n\n";
 	move(m);
 }
 
@@ -482,8 +521,7 @@ string Board::myToUpper(string input){
 		else output.push_back(input[i]);
 	}
 	
-	return output;
-	
+	return output;	
 }
 
 void Board::undo(Board& tablero){
@@ -537,18 +575,36 @@ void Board::snapshot(vector<Board>& inputVec, Board inputBoard){
 }
 
 int Board::evaluate(char max, char min){
-	//right now just evaluating number of pieces
-	if (max == 'X'){
-		return (xpieces.size() - opieces.size());
+	vector<Piece*> maxPieces = getTypePieces(max);
+	vector<Piece*> minPieces = getTypePieces(min);
+	int reflector, val, x, y = 0;
+	Piece* temp;
+
+	val += 2 * (maxPieces.size() - minPieces.size());
+
+	cout << (checkTaken(max)) << "\n";
+	cout << (checkTaken(min)) << "\n";
+	//check for taken conditions
+	if (checkTaken(min)){
+		cout << "adding 10 to val\n";
+		val += 10;
 	}
-	
-	else if (max == 'O'){
-		return (opieces.size() - xpieces.size());
+
+	if (checkTaken(max)){
+		cout << "subtracting 10 from val\n";
+		val -= 10;
 	}
-	
-	else {
-		cout << "Error in evaluate: unidentified max, must be either 'X' or 'O'.\n";
-		return 0;
+
+	//ultimate condition!
+	if (isGameOver()){
+		if (whoWon() == max)
+			val = INT_MAX / 2;
+
+		else
+			val = INT_MIN / 2;
 	}
+
+	cout << "val: " << val << "\n";
+	return val;
 }
 
diff --git a/Board.h b/Board.h
index 7af5bcf..13a820c 100644
--- a/Board.h
+++ b/Board.h
@@ -28,8 +28,8 @@ class Board {
 	vector<Piece*> xpieces;
 	vector<Piece*> opieces;
 	vector<Piece*> pieces;
+	bool valid, xtaken, otaken;
 	char turn = 'O'; 
-	bool valid = false;
 	
 public:
 	Board();
@@ -40,14 +40,15 @@ public:
 	bool isPiece(int r, int c);
 	Piece* getPiece(int r, int c);
 	void isTaken(int r, int c);
-	vector<Piece*> getXPieces() const { return xpieces; }
-	vector<Piece*> getOPieces() const { return opieces; }
-	char getTurnPls() const { return turn; }
+	bool checkTaken(char c);
+	vector<Piece*> getPieces() const { return pieces; }
+	vector<Piece*> getTypePieces(char type) const;
+	char getTurn() const { return turn; }
 	moves parse(string input);
-	char getTurn() { return turn; }
 	bool isGameOver();
-	string whoWon();
+	char whoWon();
 	void changeTurns();
+	void resetTaken();
 	void displayBoard();
 	string boardToString();
 	int charToIntColumn(char input);
diff --git a/Engine.cpp b/Engine.cpp
index 185cb90..a3024de 100644
--- a/Engine.cpp
+++ b/Engine.cpp
@@ -2,6 +2,9 @@
 #include <vector>
 #include <stdlib.h>
 #include <stdio.h>
+#include <limits.h>
+#include <time.h>
+#include <unistd.h>
 #include "Engine.h"
 
 Engine::Engine(){
@@ -13,13 +16,24 @@ void Engine::startGame(){
 	cout<<"WELCOME\n";
 	
 	cout<<"1. Play against AI?\n";
-	cout<<"2. Play against a human?\n";
+	cout<<"2. Watch AI vs AI?\n";
 	cout<<"Enter choice: \n";
 
 	int choice = -1;
 	cin >> choice;
 	cout << "OK" << endl;
 
+	if (choice == 1)
+		userGame();
+	else if (choice == 2)
+		AIGame();
+	else {
+		cout << "Please enter a valid choice.\n";
+		startGame();
+	}
+}
+
+void Engine::userGame(){
 	string move;
 
 	bool gameOver = false; 
@@ -38,13 +52,14 @@ void Engine::startGame(){
 			
 			if(b->isValid()){
 				b->changeTurns();
+				b->resetTaken();
 				b->setValidFalse();
 			}
 		}
 		
 		while(b->getTurn() == 'X' ){
-			easyAI();
-			//AI(3);
+			//easyAI();
+			AI(3);
 		}
 		
 		gameOver = b->isGameOver();
@@ -58,55 +73,114 @@ void Engine::startGame(){
 	cout << "Game over. " + s + " wins!\n\n";
 }
 
-void Engine::easyAI(){
-	vector<moves> listOfMoves = b->viewPossibleMoves();
-	
-	srand(time(NULL));
-	int randomChoice = rand() % (listOfMoves.size()-1) - 0;
-	
-	b->move(listOfMoves[randomChoice]);
-	b->changeTurns();
+void Engine::AIGame(){
+	bool gameOver = false;
+
+	while (gameOver != true){
+		gameOver = b->isGameOver();
+		
+		while(b->getTurn() == 'O'){
+			AI(3);
+		}
+		
+		b->displayBoard();
+		sleep(1);
+		
+		while(b->getTurn() == 'X' ){
+			AI(3);
+		}
+		
+		gameOver = b->isGameOver();
+	}
 }
 
 void Engine::AI(int depth){
-	Board* temp = new Board(*b);
-	moves empty;
-	MNode* root = new MNode(*temp, empty, 0);
+	Board* state = new Board(*b);
+	moves m;
+	MNode* root = new MNode(*state, m, 0);	
+	createMMTree(root, depth, 1);
+	m = evaluateMMTree(root);
 	
-	//only doing 1 branch right now because testing
-	/*for (int i = 0; i < listOfMoves.size(); ++i){
-		minMax(b, listOfMoves[i]);
-	}*/
-	
-	//remove this soon
-	//b->move(minMax(temp, listOfMoves[0], 0, 0));
-	
-	b->changeTurns();	
-	b->displayBoard();
+	printTree(0, root);
+
+	b->move(m);
+	b->changeTurns();
+	b->resetTaken();
 }
 
-moves Engine::minMax(MNode* node, int depth){
+void Engine::createMMTree(MNode* node, int depth, int alt){
+	MNode* temp;
+	char max, min;
 	Board current = node->getState();
 	vector<moves> listOfMoves = current.viewPossibleMoves();
-	/*
-	if (current.isGameOver() == true){
-		cout << "END OF PATH REACHED\n\n";
-		return m;
+	
+	if (depth >= 0){
+		for (int i = 0; i < listOfMoves.size(); ++i){
+			if(current.getPiece(8 - listOfMoves[i].row, listOfMoves[i].column)->getType() == 
+								current.getTurn() && current.isThisMovePossible(8 - listOfMoves[i].row, 
+																				listOfMoves[i].column, 
+																				listOfMoves[i].moveType)){
+				current.resetTaken();
+				current = current.move(listOfMoves[i]);
+				max = current.getTurn();
+				current.changeTurns();
+				min = current.getTurn();
+				
+				if (current.checkTaken('X'))
+					cout << "xtaken true\n";
+				if (current.checkTaken('O'))
+					cout << "otaken true\n";
+				
+				temp = new MNode(current, listOfMoves[i], current.evaluate(max, min));
+				
+				if (alt == 1)
+					temp->setType("max");
+				else if (alt == 1)
+					temp->setType("min");
+				
+				current.resetTaken();
+				node->addChild(temp);
+				
+				createMMTree(temp, --depth, alt * -1);
+				
+				current.changeTurns();
+			}
+		}
 	}
 
-	else {
-		if(current.getPiece(8 - m.row, m.column)->getType() == current.getTurn() && current.isThisMovePossible(8 - m.row, m.column, m.moveType)){
-			temp->move(m);
-			temp->evaluate('X', 'O');
-			temp->changeTurns();
-		}
-		else {
-			m = minMax(temp, listOfMoves[++r], c, r);
-		}
-		
-		vector<moves> listOfMoves = temp->viewPossibleMoves();
-		minMax(temp, listOfMoves[0], 0, 0);
-		return m;
-	}
-	*/
+	return;
 }
+
+moves Engine::evaluateMMTree(MNode* node){
+	//returns the move from children that maximizes evaluate()
+	MNode* temp;
+	moves m;
+	int max = INT_MIN;
+	int val;
+	vector<MNode*> children = node->getChildren();
+	
+	for (auto &c : children){
+		val = evaluateMMBranch(c, INT_MIN);
+		if(val > max){
+			temp = c;
+			max = val;
+		}
+	}
+	
+	return temp->getMove();
+}
+
+int Engine::evaluateMMBranch(MNode* node, int max){
+	if (node->getMMVal() > max)
+		max = node->getMMVal();
+
+	vector<MNode*> children = node->getChildren();
+	
+	for (auto &c : children){
+		evaluateMMBranch(c, max);
+	}
+
+	//cout << "max: " << max << "\n";
+	
+	return max;
+}
diff --git a/Engine.h b/Engine.h
index 89f3327..fbcb212 100644
--- a/Engine.h
+++ b/Engine.h
@@ -12,7 +12,10 @@ public:
 	Engine();
 	Board* getBoard() { return b; }
 	void startGame();
-	void easyAI();
+	void userGame();
+	void AIGame();
 	void AI(int depth);
-	moves minMax(MNode* node, int depth);
+	void createMMTree(MNode* node, int depth, int alt);
+	moves evaluateMMTree(MNode* node);
+	int evaluateMMBranch(MNode* node, int sum);
 };
diff --git a/MNode.cpp b/MNode.cpp
index 8f4c410..8865b29 100755
--- a/MNode.cpp
+++ b/MNode.cpp
@@ -31,13 +31,13 @@ bool MNode::hasChildren(){
 		return false;
 }
 
-void printTree(int depth, const MNode& n){
+void printTree(int depth, MNode* n){
 	vector<MNode*> children;
-	cout << "depth " << depth << " :" << n.getMMVal() << " ";
-	children = n.getChildren();
+	cout << "depth " << depth << " : " << n->getMMVal() << "\n";
+	children = n->getChildren();
 
 	//print out root
 	for (int i = 0; i < children.size(); ++i){
-		printTree(++depth, *children[i]);
+		printTree(++depth, children[i]);
 	}
 }
\ No newline at end of file
diff --git a/MNode.h b/MNode.h
index 1afe963..1db411e 100755
--- a/MNode.h
+++ b/MNode.h
@@ -11,6 +11,7 @@ class MNode {
 	Board state;
 	moves mvs;
 	int minimax_val;
+	string type; //min or max
 	
 public:
 	MNode();
@@ -20,11 +21,13 @@ public:
 	void addChild(MNode* n) { children.push_back(n); }
 	int getMMVal() const { return minimax_val; }
 	void setMMVal(int mmval);
-	Board getState() { return state; }
+	Board getState() const { return state; }
 	void setState(Board s) { state = s; }
-	moves getMove() { return mvs; }
+	moves getMove() const { return mvs; }
 	void setMove(moves m) { mvs = m; }
+	string getType() { return type; }
+	void setType(string t) { type = t; }
 	bool hasChildren();
 };
 
-void printTree(int depth, const MNode& n);
\ No newline at end of file
+void printTree(int depth, MNode* n);
\ No newline at end of file
diff --git a/Piece.cpp b/Piece.cpp
index a438327..bd78a31 100644
--- a/Piece.cpp
+++ b/Piece.cpp
@@ -63,7 +63,3 @@ void Piece::moveRight(){
 	else 
 		cout << "Error: trying to move an empty piece left.";
 }
-
-void Piece::isTaken(){
-	cout << getX() << " " << getY() << "\n\n";
-}
diff --git a/Piece.h b/Piece.h
index 82f6bed..4da1f83 100644
--- a/Piece.h
+++ b/Piece.h
@@ -20,5 +20,4 @@ public:
 	void setY(int c){ y = c; }
 	char getType(){ return type; }
 	void makeEmpty(){ type = '_'; }
-	void isTaken();
-};
+};
diff --git a/test.cpp b/test.cpp
index c26c406..8b1eb77 100644
--- a/test.cpp
+++ b/test.cpp
@@ -4,7 +4,6 @@ using namespace std;
 
 int main()
 {
-	//Board b;
 	Engine e;
 	e.startGame();
 }