private float MinValue(DejarikChessDuD[] state, int turnDepth, bool secondMove, float alpha, float beta)
{
if (DejTree.CutOffTest(state, turnDepth))
{
return(DejTree.Eval(state));
}
else
{
float v = 420f;
for (int i = 0; i < 25; i++)
{
if (state[i] != null && state[i].Owner == Enemy_Turn)
{
for (int j = 0; j < 25; j++)
{
if (state[i].AllPossibleMoves()[j])
{
if (state[j] == null)
{
//We are "Moving" the piece to an empty sector.
DejarikChessDuD[] newState = Utilities.FakeMoveChessPiece(state, state[i], j);
if (secondMove)
{
//This is the last move of the turn, next move is going to be ai
v = Utilities.Min(v, MaxValue(newState, turnDepth + 1, false, alpha, beta));
}
else
{
//next move is still the real person
v = Utilities.Min(v, MinValue(newState, turnDepth, true, alpha, beta));
}
}
else
{
//We are "Attacking" another piece
int nextTurn = Enemy_Turn;
if (secondMove)
{
nextTurn = Player_Turn;
}
DejarikChessDuD[] dudState = Utilities.Clone(state);
v = Utilities.Max(v, ChanceValue(dudState, i, j, turnDepth, secondMove, alpha, beta, nextTurn));
}
if (v <= alpha)
{
return(v);
}
if (v < beta)
{
beta = v;
}
}
}
}
}
return(v);
}
}
private float MaxValue(DejarikChessDuD[] state, int turnDepth, bool secondMove, float alpha, float beta)
{
float v = 0f;
if (DejTree.CutOffTest(state, turnDepth)) //should be false until last move or a certain depth
{
v = DejTree.Eval(state);
}
else
{
v = -420f;
for (int i = 0; i < 25; i++)
{
if (state[i] != null && state[i].Owner == Player_Turn && state[i].AllPossibleMoves() != null)
{
for (int j = 0; j < 25; j++)
{
if (state[i].AllPossibleMoves()[j])
{
if (state[j] == null)
{
DejarikChessDuD[] newState = Utilities.FakeMoveChessPiece(state, state[i], j);
//We are "Moving" the piece to an empty sector.
if (secondMove)
{
//This is the last move of the turn, next move is going to be enemy
v = Utilities.Max(v, MinValue(newState, turnDepth + 1, false, alpha, beta));
}
else
{
//next move is still ai, but is the last (second)
v = Utilities.Max(v, MaxValue(newState, turnDepth, true, alpha, beta));
}
}
else
{
//We are "Attacking" another piece
//This is the last move of the turn, next move is going to be enemy
v = Utilities.Max(v, ChanceValue(state, i, j, turnDepth, secondMove, alpha, beta, Player_Turn));
}
if (v >= beta)
{
return(v);
}
if (v > alpha)
{
alpha = v;
}
}
}
}
}
}
return(v);
}
void ThreadedWork()
{
try
{
_threadRunning = true;
bool workDone = false;
for (int i = 0; i < 25; i++)
{
int[] adiacents = BoardManager.AdiacentSectors(i);
for (int j = 0; j < adiacents.Length; j++)
{
if (adiacents[j] < 0 || adiacents[j] > 24)
{
Debug.Log("AdiacentSectors fail: sector " + i + " has adiacent " + adiacents[j]);
}
}
}
// This pattern lets us interrupt the work at a safe point if neeeded.
int turnDepth = 0;
float oldv = -1000f;
float v = -1000f;
float alpha = -1000f;
float beta = 1000f;
if (waitingForPush)
{
int[] possiblePushSectors = BoardManager.AdiacentSectors(pushedPiece.CurrentSector);
fromSector = pushedPiece.CurrentSector;
int found = 0;
int sectorFound = -1;
for (int i = 0; i < possiblePushSectors.Length; i++)
{
if (realState[possiblePushSectors[i]] == null)
{
found++;
sectorFound = possiblePushSectors[i];
}
}
if (found == 1)
{
toSector = sectorFound;
}
else
{
for (int i = 0; _threadRunning && i < possiblePushSectors.Length; i++)
{
if (realState[possiblePushSectors[i]] == null)
{
//we can move the piece into sector "i"
DejarikChessDuD[] newState = Utilities.FakeMoveChessPiece(realState, realState[pushedPiece.CurrentSector], possiblePushSectors[i]);
if (originalTurn == Player_Turn)
{
//next action is taken by AI
v = Utilities.Max(v, MaxValue(newState, turnDepth, secondMove, alpha, beta));
}
else
{
//next action is taken by a Real Person (tm)
v = Utilities.Max(v, MinValue(newState, turnDepth, secondMove, alpha, beta));
}
if (oldv != v)
{
toSector = possiblePushSectors[i];
}
if (v >= beta)
{
workDone = true;
break;
}
if (v > alpha)
{
alpha = v;
}
oldv = v;
}
}
}
workDone = true;
}
else
{
if (DejTree.CutOffTest(realState, turnDepth)) //should be false until last move or a certain depth
{
v = DejTree.Eval(realState);
}
else
{
int i = 0;
for (i = 0; _threadRunning && i < 25; i++)
{
if (realState[i] != null && realState[i].Owner == Player_Turn)
{
//Debug.Log("Starting to evaluate actions available for piece" + state[i].Name);
if (realState[i].AllPossibleMoves() == null)
{
// Debug.Log("Possible moves for " + state[i].Name + " are null");
continue;
}
int j = 0;
for (j = 0; _threadRunning && j < 25; j++)
{
bool possibleMove = realState[i].AllPossibleMoves()[j];
if (possibleMove)
{
if (realState[j] == null)
{
//We are "Moving" the piece to an empty sector.
DejarikChessDuD[] newState = Utilities.FakeMoveChessPiece(realState, realState[i], j);
if (secondMove)
{
//This is the last move of the turn, next move is going to be enemy
v = Utilities.Max(v, MinValue(newState, turnDepth + 1, false, alpha, beta));
}
else
{
//next move is still ai, but is the last (second)
v = Utilities.Max(v, MaxValue(newState, turnDepth, true, alpha, beta));
}
}
else
{
//We are "Attacking" another piece
//This is the last move of the turn, next move is going to be enemy
int nextTurn = Player_Turn;
if (secondMove)
{
nextTurn = Enemy_Turn;
}
DejarikChessDuD[] dudState = Utilities.Clone(realState);
v = Utilities.Max(v, ChanceValue(dudState, i, j, turnDepth, secondMove, alpha, beta, nextTurn));
}
if (oldv != v)
{
fromSector = i;
toSector = j;
}
if (v >= beta)
{
//return v;
//break out of both cycles and move on
workDone = true;
break;
}
if (v > alpha)
{
alpha = v;
}
oldv = v;
}
// Debug.Log("Finished to evaluate action " + j + " for piece" + state[i].Name);
}
//Debug.Log("Finished to evaluate actions available for piece" + state[i].Name);
if (workDone)
{
break;
}
}
}
}
}
workDone = true;
_threadRunning = false;
}
catch (System.Exception e)
{
System.Console.WriteLine(e.Message);
}
}
//This is the main Coroutine, executing every "coroutineInterval" instead of every frame
private IEnumerator MainCoroutine()
{
//Build a minmax tree for imperfect, adversarial, stochastic alpha-beta search.
//Every max/min node is separated by a chance node.
//Some chance nodes have only 1 child, with probability==1 (deterministic movements)
//Every turn contains two moves.
//Wait for board to initialize
while (!board.initialized)
{
yield return(new WaitForSeconds(2 * coroutineInterval));
}
DejarikChessPiece[] currentRealState = new DejarikChessPiece[25];
DejarikChessDuD[] state = new DejarikChessDuD[25];
float v = -2000f;
float oldv = v;
int fromSector = -1;
int toSector = -1;
while (!board.gameEnded)
{
//version 1: we wait for our turn to calculate everything.
while (board.currentTurn != this.Player_Turn)
{
yield return(new WaitForSeconds(5 * coroutineInterval));
}
Debug.Log("Starting search");
//We get the current state of the game
for (int i = 0; i < 25; i++)
{
currentRealState[i] = board.getPieceInSector(i);
if (board.getPieceInSector(i) != null)
{
state[i] = new DejarikChessDuD(currentRealState[i].Name, currentRealState[i].Attack, currentRealState[i].Defense, currentRealState[i].Movement,
currentRealState[i].CurrentSector, currentRealState[i].Owner, currentRealState[i].pieceType, currentRealState[i].AllPossibleMoves());
}
else
{
state[i] = null;
}
}
//Simulating first move at level 0
float alpha = -1000f;
float beta = 1000f;
int turnDepth = 0;
bool vFound = false;
bool secondMove = (board.actionsLeft == 1);
if (board.waitingForPush)
{
int[] possiblePushSectors = BoardManager.AdiacentSectors(board.pushed.CurrentSector);
fromSector = board.pushed.CurrentSector;
for (int i = 0; i < possiblePushSectors.Length; i++)
{
if (state[i] == null)
{
//we can move the piece into sector "i"
DejarikChessDuD[] newState = Utilities.FakeMoveChessPiece(state, state[board.pushed.CurrentSector], i);
if ((board.originalTurn == Player_Turn && !secondMove) || (board.originalTurn == Enemy_Turn && secondMove))
{
//next action is taken by AI
v = Utilities.Max(v, MaxValue(newState, turnDepth, secondMove, alpha, beta));
}
else
{
//next action is taken by a Real Person (tm)
v = Utilities.Max(v, MinValue(newState, turnDepth, secondMove, alpha, beta));
}
if (oldv != v)
{
toSector = i;
}
if (v >= beta)
{
break;
}
if (v > alpha)
{
alpha = v;
}
oldv = v;
}
}
}
else
{
if (DejTree.CutOffTest(state, turnDepth)) //should be false until last move or a certain depth
{
v = DejTree.Eval(state);
}
else
{
v = -420f;
int i = 0;
for (i = 0; i < 25; i++)
{
if (state[i] != null && state[i].Owner == Player_Turn)
{
Debug.Log("Starting to evaluate actions available for piece" + state[i].Name);
if (state[i].AllPossibleMoves() == null)
{
Debug.Log("Possible moves for " + state[i].Name + " are null");
continue;
}
int j = 0;
for (j = 0; j < 25; j++)
{
if (state[i].AllPossibleMoves()[j])
{
if (state[j] == null)
{
//We are "Moving" the piece to an empty sector.
DejarikChessDuD[] newState = Utilities.FakeMoveChessPiece(state, state[i], j);
if (secondMove)
{
//This is the last move of the turn, next move is going to be enemy
v = Utilities.Max(v, MinValue(newState, turnDepth + 1, false, alpha, beta));
}
else
{
//next move is still ai, but is the last (second)
v = Utilities.Max(v, MaxValue(newState, turnDepth, true, alpha, beta));
}
}
else
{
//We are "Attacking" another piece
//This is the last move of the turn, next move is going to be enemy
v = Utilities.Max(v, ChanceValue(state, i, j, turnDepth, secondMove, alpha, beta, Player_Turn));
}
if (oldv != v)
{
fromSector = i;
toSector = j;
}
if (v >= beta)
{
//return v;
//break out of both cycles and move on
vFound = true;
break;
}
if (v > alpha)
{
alpha = v;
}
oldv = v;
Debug.Log("Finished to evaluate action " + j + " for piece" + state[i].Name);
}
yield return(new WaitForSeconds(coroutineInterval));
}
//I need to return control to Unity
Debug.Log("Finished to evaluate actions available for piece" + state[i].Name);
yield return(new WaitForSeconds(coroutineInterval));
if (vFound)
{
break;
}
}
}
}
}
// the action of the node with value v
selectedChessPiece = currentRealState[fromSector];
if (currentRealState[toSector] == null)
{
if (board.waitingForPush)
{
PushChessPiece(toSector);
}
else
{
MoveChessPiece(toSector);
}
}
else
{
//attack
AttackChessPiece(toSector);
}
}
}