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ChessAI.java
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ChessAI.java
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/**
* @(#)ChessAI.java
*
*
* @author
* @version 1.00 2016/11/2
*/
import java.util.*;
public abstract class ChessAI {
private static boolean ENPASSANT_ENABLED = true;
private static boolean CASTLING_ENABLED = true;
public ChessAI() {
}
public static int[] aiMiniMax(int[][] PARAMETER_ARRAY, int side, int searchDepth){
int[][] arr=ArrayOps.copyArr8(PARAMETER_ARRAY);
//System.out.print("N");
if (testGameOver(arr)||searchDepth==0){
//System.out.print("L");
int[] out={-1,-1,-1,-1,getScore(arr)};
return out;
}
ArrayList<Integer> scores = new ArrayList<Integer>();
ArrayList<int[]> moves = new ArrayList<int[]>();
int[][] myPieces = new int[arr.length][arr[0].length];
for(int i=0; i<arr.length; i++){
for (int j=0; j<arr[0].length; j++){
if(arr[i][j]/(side*10)==1){
int[][] legalMoveBoard=legalMoves(i,j,arr);
for(int a=0; a<arr.length; a++){
for(int b=0; b<arr[0].length; b++){
if(legalMoveBoard[a][b]==1){
int[] moveItem = {i,j,a,b};
moves.add(moveItem);
int[][] recurArr = ArrayOps.copyArr8(arr);
recurArr=makeMove(moveItem,recurArr);
if(side==1){
scores.add(aiMiniMax(recurArr,2,searchDepth-1)[4]);
} else if(side==2){
scores.add(aiMiniMax(recurArr,1,searchDepth-1)[4]);
}
}
}
}
}
}
}
for(int[] possibleMove:moves){
scores.add(getMoveScore(possibleMove, arr));
}
ArrayList<Integer> order = new ArrayList<Integer>();
for(int i=0;i<moves.size();i++){
order.add(i);
}
Collections.shuffle(order);
if(side==1){
int index = 0;
int maxScore=Integer.MIN_VALUE;
for(int i:order){
if(scores.get(i)>maxScore){
maxScore=scores.get(i);
index=i;
}
}
if (moves.size()==0){
if(ChessOps.kingChecked(arr, side,ENPASSANT_ENABLED)){
int[] outArr = {-1,-1,-1,-1,Integer.MIN_VALUE};
return outArr;
} else {
int[] outArr = {-2,-2,-2,-2,Integer.MIN_VALUE};
return outArr;
}
} else {
int[] outArr = {moves.get(index)[0],moves.get(index)[1],moves.get(index)[2],moves.get(index)[3],maxScore};
return outArr;
}
} else {
int index = 0;
int minScore=Integer.MAX_VALUE;
for(int i:order){
if(scores.get(i)<minScore){
minScore=scores.get(i);
index=i;
}
}
if (moves.size()==0){
if(ChessOps.kingChecked(arr, side,ENPASSANT_ENABLED)){
int[] outArr = {-1,-1,-1,-1,Integer.MAX_VALUE};
return outArr;
} else {
int[] outArr = {-2,-2,-2,-2,Integer.MAX_VALUE};
return outArr;
}
} else {
int[] outArr = {moves.get(index)[0],moves.get(index)[1],moves.get(index)[2],moves.get(index)[3],minScore};
return outArr;
}
}
}
private static int getMoveScore(int[] move, int[][] PARAMETER_ARRAY){
int[][] arr = ArrayOps.copyArr8(PARAMETER_ARRAY);
arr=makeMove(move, arr);
return getScore(arr);
}
private static int getScore(int[][] PARAMETER_ARRAY){
int [][] arr = ArrayOps.copyArr8(PARAMETER_ARRAY);
double fitness=0;
for(int[] foo: arr){
for(int bar:foo){
int piece = bar%10;
if(bar/10==1){
if (piece==1||piece==7)
fitness+=1;
if (piece==2)
fitness+=3.5;
if (piece==3)
fitness+=3.5;
if (piece==4||piece==8)
fitness+=5.25;
if (piece==5)
fitness+=10;
if (piece==6||piece==9)
fitness+=1000;
}else{
if (piece==1||piece==7)
fitness-=1;
if (piece==2)
fitness-=3.5;
if (piece==3)
fitness-=3.5;
if (piece==4||piece==8)
fitness-=5.25;
if (piece==5)
fitness-=10;
if (piece==6||piece==9)
fitness-=1000;
}
}
}
return (int)(fitness*100);
}
private static int[][] legalMoves(int r, int c, int[][] tempArr){
int[][] inArr = ArrayOps.copyArr8(tempArr);
int[][] out = ChessOps.pseudoLegalMoves(r,c,inArr,ENPASSANT_ENABLED);
if(CASTLING_ENABLED){
//WHITE CASTLE KINGSIDE
if(inArr[r][c]==19&&inArr[7][5]==0&&inArr[7][6]==0&&inArr[7][7]==18){
int[][] tempArrMove = ArrayOps.copyArr8(inArr);
if (!ChessOps.kingChecked(tempArrMove,1,ENPASSANT_ENABLED)){
tempArrMove=makeMove(7,4,7,5,tempArrMove);
if (!ChessOps.kingChecked(tempArrMove,1,ENPASSANT_ENABLED)){
int[][] tempArrMove2 = ArrayOps.copyArr8(inArr);
tempArrMove2=makeMove(7,4,7,6,tempArrMove2);
if (!ChessOps.kingChecked(tempArrMove2,1,ENPASSANT_ENABLED)){
out[7][6]=1;
}
}
}
}
//BLACK CASTLE KINGSIDE
if(inArr[r][c]==29&&inArr[0][5]==0&&inArr[0][6]==0&&inArr[0][7]==28){
int[][] tempArrMove = ArrayOps.copyArr8(inArr);
if (!ChessOps.kingChecked(tempArrMove,2,ENPASSANT_ENABLED)){
tempArrMove=makeMove(0,4,0,5,tempArrMove);
if (!ChessOps.kingChecked(tempArrMove,2,ENPASSANT_ENABLED)){
int[][] tempArrMove2 = ArrayOps.copyArr8(inArr);
tempArrMove2=makeMove(0,4,0,6,tempArrMove2);
if (!ChessOps.kingChecked(tempArrMove2,2,ENPASSANT_ENABLED)){
out[0][6]=1;
}
}
}
}
//WHITE CASTLE QUEENSIDE
if(inArr[r][c]==19&&inArr[7][3]==0&&inArr[7][2]==0&&inArr[7][1]==0&&inArr[7][0]==18){
int[][] tempArrMove = ArrayOps.copyArr8(inArr);
if (!ChessOps.kingChecked(tempArrMove,1,ENPASSANT_ENABLED)){
tempArrMove=makeMove(7,4,7,3,tempArrMove);
if (!ChessOps.kingChecked(tempArrMove,1,ENPASSANT_ENABLED)){
int[][] tempArrMove2 = ArrayOps.copyArr8(inArr);
tempArrMove2=makeMove(7,4,7,2,tempArrMove2);
if (!ChessOps.kingChecked(tempArrMove2,1,ENPASSANT_ENABLED)){
int[][] tempArrMove3 = ArrayOps.copyArr8(inArr);
tempArrMove3=makeMove(7,4,7,1,tempArrMove3);
if (!ChessOps.kingChecked(tempArrMove3,1,ENPASSANT_ENABLED)){
out[7][2]=1;
}
}
}
}
}
//BLACK CASTLE QUEENSIDE
if(inArr[r][c]==29&&inArr[0][3]==0&&inArr[0][2]==0&&inArr[0][1]==0&&inArr[0][0]==28){
int[][] tempArrMove = ArrayOps.copyArr8(inArr);
if (!ChessOps.kingChecked(tempArrMove,2,ENPASSANT_ENABLED)){
tempArrMove=makeMove(0,4,0,3,tempArrMove);
if (!ChessOps.kingChecked(tempArrMove,2,ENPASSANT_ENABLED)){
int[][] tempArrMove2 = ArrayOps.copyArr8(inArr);
tempArrMove2=makeMove(0,4,0,2,tempArrMove2);
if (!ChessOps.kingChecked(tempArrMove2,2,ENPASSANT_ENABLED)){
int[][] tempArrMove3 = ArrayOps.copyArr8(inArr);
tempArrMove3=makeMove(0,4,0,1,tempArrMove3);
if (!ChessOps.kingChecked(tempArrMove3,2,ENPASSANT_ENABLED)){
out[0][2]=1;
}
}
}
}
}
}
for(int i=0; i<8; i++){
for(int j=0; j<8; j++){
if(out[i][j]==1){
int[][] tempArrMove = ArrayOps.copyArr8(inArr);
tempArrMove=makeMove(r,c,i,j,tempArrMove);
if (ChessOps.kingChecked(tempArrMove,(inArr[r][c]/10),ENPASSANT_ENABLED)){
out[i][j]=0;
}
}
}
}
return out;
}
private static int[][] makeMove(int[] moveArr, int[][] inArr){
return makeMove(moveArr[0],moveArr[1],moveArr[2],moveArr[3],inArr);
}
private static int[][] makeMove(int i1 ,int j1 ,int i2 ,int j2 , int[][] inArr){
int[][] boardArr=ArrayOps.copyArr8(inArr);
boolean captureBool = boardArr[i2][j2]!=0;
boardArr[i2][j2] = boardArr[i1][j1];
boardArr[i1][j1] = 0;
if(boardArr[i2][j2]==11&&i2==0){
boardArr[i2][j2]=15;
}else if(boardArr[i2][j2]==21&&i2==7){
boardArr[i2][j2]=25;
}
if(boardArr[i2][j2]==19){
boardArr[i2][j2]=16;
if(j2==6){
boardArr[7][5]=14;
boardArr[7][7]=0;
} else if(j2==2){
boardArr[7][3]=14;
boardArr[7][0]=0;
}
}else if(boardArr[i2][j2]==29){
boardArr[i2][j2]=26;
if(j2==6){
boardArr[0][5]=24;
boardArr[0][7]=0;
} else if(j2==2){
boardArr[0][3]=24;
boardArr[0][0]=0;
}
}
if(boardArr[i2][j2]==18){
boardArr[i2][j2]=14;
}else if(boardArr[i2][j2]==28){
boardArr[i2][j2]=24;
}
int side=boardArr[i2][j2]/10;
for(int a=0; a<8; a++){
for(int b=0; b<8; b++){
if(boardArr[a][b]/10==(side%2+1)&&boardArr[a][b]%10==7){
boardArr[a][b]=(side%2+1)*10+1;
}
}
}
if(boardArr[i2][j2]==11&&i1==6&&i2==4){
boardArr[i2][j2]=17;
} else if(boardArr[i2][j2]==21&&i1==1&&i2==3){
boardArr[i2][j2]=27;
}
if(boardArr[i2][j2]==11&&j1-j2!=0&&!captureBool){
boardArr[i2+1][j2]=0;
}
if(boardArr[i2][j2]==21&&j1-j2!=0&&!captureBool){
boardArr[i2-1][j2]=0;
}
return boardArr;
}
private static boolean testGameOver(int[][] PARAMETER_ARRAY){
int kingCount=0;
for(int[] foo:PARAMETER_ARRAY){
for(int bar:foo){
if(bar%10==6||bar%10==9){
kingCount++;
}
}
}
return kingCount!=2;
}
}