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alphabeta.c
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alphabeta.c
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#include "alphabeta.h"
void AlphaBeta_getColumnMoveOrder(void) {
for (int c = 0; c < (int)COLUMNS; ++c) {
moveOrder[c] = COLUMNS / 2 + (1 - 2 * (c & 1)) * (c + 1) / 2;
}
}
bool AlphaBeta_normal_checkWin(ConnectFour *cf) {
for (unsigned c = 0; c < COLUMNS; ++c) {
if (ConnectFour_connection(cf->board[cf->plyNumber & 1u] | (Position)1ull << cf->height[c] & ALL)) {
return true;
}
}
return false;
}
bool AlphaBeta_normal_checkSeveralWaysToWin(ConnectFour *cf) {
Position forced = (ALL & (cf->board[0] | cf->board[1]) + BOT) & ConnectFour_calculateAllThreats(cf->board[!(cf->plyNumber & 1u)]);
return forced && forced & (forced - 1ull);
}
bool AlphaBeta_popout_checkWin(ConnectFour *cf) {
for (unsigned c = 0; c < COLUMNS; ++c) {
if (ConnectFour_connection(cf->board[cf->plyNumber & 1] | (Position)1ull << cf->height[c] & ALL)) {
return true;
}
if (ConnectFour_popout_popWinCheck(cf, c)) {
if (ConnectFour_connectionNoVertical(cf->board[cf->plyNumber & 1])) {
ConnectFour_popout_unpopWinCheck(cf, c);
return true;
}
ConnectFour_popout_unpopWinCheck(cf, c);
}
}
return false;
}
bool AlphaBeta_popten_checkDraw(ConnectFour *cf) {
return (popcount(cf->board[0]) < 4) && (popcount(cf->board[1]) < 4) && (((cf->collectedDisks & 0xf) < 10) || (((cf->collectedDisks & 0xf0) >> 4) < 10));
}
bool AlphaBeta_powerup_checkWin(ConnectFour *cf) {
unsigned c, turn = cf->plyNumber & 1u;
/*Position oldBoard[2] = { cf->board[0], cf->board[1] }, oldPowerCheckers[4] = { cf->pc->anvil, cf->pc->bomb, cf->pc->wall, cf->pc->x2 };
unsigned short oldPPC = cf->playedPowerCheckers, oldStatus = cf->pum[cf->plyNumber].status;*/
for (c = 0; c < COLUMNS; ++c) {
if ((cf->pum[cf->plyNumber].status == POWERUP_DROP_NORMAL_OR_ANVIL || cf->pum[cf->plyNumber].status == POWERUP_DROP_X2) && ConnectFour_connection(cf->board[turn] | (Position)1ull << cf->height[c] & ALL)) {
return true;
}
if (ConnectFour_powerup_dropAnvil(cf, c)) {
if (ConnectFour_connection(cf->board[turn])) {
ConnectFour_powerup_undropAnvil(cf);
return true;
}
ConnectFour_powerup_undropAnvil(cf);
/*assert(cf->board[0] == oldBoard[0] && cf->board[1] == oldBoard[1] &&
oldStatus == cf->pum[cf->plyNumber].status &&
oldPPC == cf->playedPowerCheckers &&
oldPowerCheckers[0] == cf->pc->anvil &&
oldPowerCheckers[1] == cf->pc->bomb &&
oldPowerCheckers[2] == cf->pc->wall &&
oldPowerCheckers[3] == cf->pc->x2);*/
}
if (ConnectFour_powerup_dropBomb(cf, c)) {
if (ConnectFour_connection(cf->board[turn])) {
ConnectFour_powerup_undropBomb(cf);
return true;
}
ConnectFour_powerup_undropBomb(cf);
}
if (ConnectFour_powerup_pop(cf, c)) {
if (ConnectFour_connectionNoVertical(cf->board[turn])) {
ConnectFour_powerup_unpop(cf);
return true;
}
ConnectFour_powerup_unpop(cf);
/*assert(cf->board[0] == oldBoard[0] && cf->board[1] == oldBoard[1] &&
oldStatus == cf->pum[cf->plyNumber].status &&
oldPPC == cf->playedPowerCheckers &&
oldPowerCheckers[0] == cf->pc->anvil &&
oldPowerCheckers[1] == cf->pc->bomb &&
oldPowerCheckers[2] == cf->pc->wall &&
oldPowerCheckers[3] == cf->pc->x2);*/
}
if (ConnectFour_powerup_dropX2(cf, c)) {
if (ConnectFour_connection(cf->board[turn])) {
ConnectFour_powerup_undropX2(cf);
return true;
}
ConnectFour_powerup_undropX2(cf);
/*assert(cf->board[0] == oldBoard[0] && cf->board[1] == oldBoard[1] &&
oldStatus == cf->pum[cf->plyNumber].status &&
oldPPC == cf->playedPowerCheckers &&
oldPowerCheckers[0] == cf->pc->anvil &&
oldPowerCheckers[1] == cf->pc->bomb &&
oldPowerCheckers[2] == cf->pc->wall &&
oldPowerCheckers[3] == cf->pc->x2);*/
}
}
/*assert(cf->board[0] == oldBoard[0] && cf->board[1] == oldBoard[1] &&
oldStatus == cf->pum[cf->plyNumber].status &&
oldPPC == cf->playedPowerCheckers &&
oldPowerCheckers[0] == cf->pc->anvil &&
oldPowerCheckers[1] == cf->pc->bomb &&
oldPowerCheckers[2] == cf->pc->wall &&
oldPowerCheckers[3] == cf->pc->x2);*/
return false;
}
/*for (d = 0; d < COLUMNS; ++d) {
if (ConnectFour_powerup_dropBomb(cf, c)) {
if (ConnectFour_connection(cf->board[turn])) {
ConnectFour_printBoard(cf);
if (ConnectFour_powerup_pop(cf, d)) {
if (ConnectFour_connection(cf->board[turn])) {
ConnectFour_powerup_undropBomb(cf);
ConnectFour_powerup_undropBomb(cf);
assert(cf->board[0] == oldBoard[0] && cf->board[1] == oldBoard[1] && oldPPC == cf->playedPowerCheckers);
return true;
}
ConnectFour_powerup_undropBomb(cf);
}
ConnectFour_powerup_undropBomb(cf);
}
}
if (ConnectFour_powerup_dropX2(cf, c, d)) {
if (ConnectFour_connection(cf->board[turn])) {
ConnectFour_powerup_undropX2(cf);
assert(cf->board[0] == oldBoard[0] && cf->board[1] == oldBoard[1] && oldPPC == cf->playedPowerCheckers);
return true;
}
ConnectFour_powerup_undropX2(cf);
}
}*/
bool AlphaBeta_popten_checkWin(ConnectFour *cf) {
for (unsigned c = 0; c < COLUMNS; ++c) {
if (ConnectFour_popten_pop(cf, c)) {
if (ConnectFour_hasTenDisks(cf)) {
ConnectFour_popten_unpop(cf);
return true;
}
ConnectFour_popten_unpop(cf);
}
}
return false;
}
int AlphaBeta_negamax_normal(ConnectFour *cf, int depth, int alpha, int beta) {
int rootScore, leafScore;
unsigned c;
++nodes;
if ((tableScore = TranspositionTable_normal_loadValue(&table, (hashKey = ConnectFour_getHashKey(cf))))) {
return tableScore;
}
if (AlphaBeta_normal_checkWin(cf)) {
return PLAYER_WIN;
}
if (!depth) {
return DRAW;
}
rootScore = alpha;
for (c = 0; c < COLUMNS; ++c) {
if (ConnectFour_normal_drop(cf, moveOrder[c])) {
if ((leafScore = -AlphaBeta_negamax_normal(cf, depth - 1, -beta, -alpha)) > rootScore) {
rootScore = leafScore;
}
ConnectFour_normal_undrop(cf);
if (alpha < rootScore) {
TranspositionTable_storeWithoutDepth(&table, (hashKey = ConnectFour_getHashKey(cf)), (alpha = rootScore));
}
if (alpha >= beta) {
return alpha;
}
}
}
TranspositionTable_storeWithoutDepth(&table, (hashKey = ConnectFour_getHashKey(cf)), alpha);
return alpha;
}
int AlphaBeta_negamax_normal_withMoves(ConnectFour *cf, int currDepth, int maxDepth, int alpha, int beta) {
int rootScore, branchScore;
unsigned c;
++nodes;
if ((tableScore = TranspositionTable_normal_loadValue(&table, (hashKey = ConnectFour_getHashKey(cf))))) {
switch (TranspositionTable_loadBounds(&table, hashKey)) {
case TT_LOWERBOUND:
if (alpha < tableScore) {
alpha = tableScore;
}
if (alpha >= beta) {
return alpha;
}
break;
case TT_UPPERBOUND:
if (beta > tableScore) {
beta = tableScore;
}
if (alpha >= beta) {
return beta;
}
}
}
for (c = 0; c < COLUMNS; ++c) {
if (ConnectFour_connection(cf->board[cf->plyNumber & 1u] | (Position)1ull << cf->height[c] & ALL)) {
pv[currDepth] = c + '1';
return PLAYER_WIN;
}
}
if (currDepth >= maxDepth) {
return DRAW;
}
rootScore = alpha;
for (c = 0; c < COLUMNS; ++c) {
if (ConnectFour_normal_drop(cf, moveOrder[c])) {
if ((branchScore = -AlphaBeta_negamax_normal_withMoves(cf, currDepth + 1, maxDepth, -beta, -alpha)) > rootScore) {
pv[currDepth] = moveOrder[c] + '1';
rootScore = branchScore;
}
ConnectFour_normal_undrop(cf);
if (alpha < rootScore) {
TranspositionTable_storeBounds(&table, (hashKey = ConnectFour_getHashKey(cf)), (alpha = rootScore), maxDepth, TT_LOWERBOUND);
}
if (alpha >= beta) {
return alpha;
}
}
}
TranspositionTable_storeBounds(&table, (hashKey = ConnectFour_getHashKey(cf)), alpha, maxDepth, TT_UPPERBOUND);
return alpha;
}
int AlphaBeta_negamax_popout(ConnectFour *cf, int depth, int alpha, int beta) {
int rootScore, branchScore;
unsigned c;
++nodes;
if (abs((tableScore = TranspositionTable_popout_loadValue(&table, (hashKey = ConnectFour_getHashKey(cf))))) >= PLAYER_WIN) {
if (TranspositionTable_depthLessOrEqual(&table, hashKey, depth)) {
return tableScore;
}
}
if (AlphaBeta_popout_checkWin(cf)) {
return PLAYER_WIN;
}
/*if (ConnectFour_repetition(cf)) {
return -DRAW_OR_WIN;
if (repetitionFlag) {
uint8_t repetitionMove;
int repetitionDepth = MOVESIZE - cf->plyNumber, repetitionScore, currentScore, opponentScore, * dropScores = malloc(sizeof(int) * COLUMNS), * popScores = malloc(sizeof(int) * COLUMNS), d;
bool isPopMove = false;
repetitionFlag = 0;
ConnectFour_printBoard(cf);
if ((repetitionMove = cf->moves[cf->plyNumber - 4u]) >= COLUMNS) {
repetitionMove -= COLUMNS;
isPopMove = true;
}
isPopMove ? (popScores[repetitionMove] = DRAW) : (dropScores[repetitionMove] = DRAW);
for (c = 0; c < COLUMNS; ++c) {
if (!(c == repetitionMove && isPopMove)) {
popScores[c] = INT_MIN;
if (ConnectFour_popout_pop(cf, c)) {
ConnectFour_printBoard(cf);
for (d = 0, currentScore = -PLAYER_WIN, opponentScore = DRAW_OR_WIN; d < repetitionDepth; ++d) {
ConnectFour_clearHistory(cf);
if ((repetitionScore = AlphaBeta_negamax_popout(cf, d, -PLAYER_WIN, PLAYER_WIN)) > currentScore) {
currentScore = repetitionScore;
popScores[c] = currentScore;
if (abs(currentScore) >= PLAYER_WIN || abs(currentScore) == DRAW_OR_WIN) {
break;
}
}
}
ConnectFour_popout_unpop(cf);
}
}
if (!(c == repetitionMove && !isPopMove)) {
dropScores[c] = INT_MIN;
if (ConnectFour_popout_drop(cf, c)) {
ConnectFour_printBoard(cf);
for (d = 0, currentScore = -PLAYER_WIN, opponentScore = DRAW_OR_WIN; d < repetitionDepth; ++d) {
ConnectFour_clearHistory(cf);
if ((repetitionScore = AlphaBeta_negamax_popout(cf, d, -PLAYER_WIN, PLAYER_WIN)) > currentScore) {
currentScore = repetitionScore;
dropScores[c] = currentScore;
if (abs(currentScore) >= PLAYER_WIN || abs(currentScore) == DRAW_OR_WIN) {
break;
}
}
}
ConnectFour_popout_undrop(cf);
}
}
}
ConnectFour_printBoard(cf);
repetitionScore = INT_MIN;
for (c = 0; c < COLUMNS; ++c) {
if (repetitionScore < dropScores[c]) {
repetitionScore = dropScores[c];
}
if (repetitionScore < popScores[c]) {
repetitionScore = popScores[c];
}
}
repetitionFlag = 1;
free(dropScores);
free(popScores);
return repetitionScore;
}
else {
RepetitionTable_add(&rTable, hashKey);
return -DRAW_OR_WIN;
}
}*/
if (!depth) { // || cf->plyNumber >= MOVESIZE_M1) {
return -IN_PROGRESS;
}
rootScore = alpha;
for (c = 0; c < COLUMNS; ++c) {
if (ConnectFour_popout_drop(cf, moveOrder[c])) {
if ((branchScore = -AlphaBeta_negamax_popout(cf, depth - 1, -beta, -alpha)) > rootScore) {
rootScore = branchScore;
}
ConnectFour_popout_undrop(cf);
if (alpha < rootScore) {
TranspositionTable_store(&table, (hashKey = ConnectFour_getHashKey(cf)), (alpha = rootScore), depth);
}
if (alpha >= beta) {
return alpha;
}
}
}
for (c = 0; c < COLUMNS; ++c) {
if (ConnectFour_popout_pop(cf, moveOrder[c])) {
if ((branchScore = -AlphaBeta_negamax_popout(cf, depth - 1, -beta, -alpha)) > rootScore) {
rootScore = branchScore;
}
ConnectFour_popout_unpop(cf);
if (alpha < rootScore) {
TranspositionTable_store(&table, (hashKey = ConnectFour_getHashKey(cf)), (alpha = rootScore), depth);
}
if (alpha >= beta) {
return alpha;
}
}
}
TranspositionTable_store(&table, (hashKey = ConnectFour_getHashKey(cf)), alpha, depth);
return alpha;
}
int AlphaBeta_negamax_popout_withMoves(ConnectFour *cf, int currDepth, int maxDepth, int alpha, int beta) {
int rootScore, branchScore;
unsigned c;
++nodes;
if ((tableScore = TranspositionTable_popout_loadValue(&table, (hashKey = ConnectFour_getHashKey(cf)))) != TT_POPOUT_UNKNOWN) {
if (TranspositionTable_depthGreaterOrEqual(&table, hashKey, maxDepth)) {
switch (TranspositionTable_loadBounds(&table, hashKey)) {
case TT_LOWERBOUND:
if (alpha < tableScore) {
alpha = tableScore;
}
if (alpha >= beta) {
return alpha;
}
break;
case TT_UPPERBOUND:
if (beta > tableScore) {
beta = tableScore;
}
if (alpha >= beta) {
return beta;
}
}
}
}
for (c = 0; c < COLUMNS; ++c) {
if (ConnectFour_connection(cf->board[cf->plyNumber & 1u] | (Position)1ull << cf->height[c] & ALL)) {
pv[currDepth] = c + '1';
return PLAYER_WIN;
}
if (ConnectFour_popout_popWinCheck(cf, c)) {
if (ConnectFour_connectionNoVertical(cf->board[cf->plyNumber & 1u])) {
ConnectFour_popout_unpopWinCheck(cf, c);
pv[currDepth] = c + 'A';
return PLAYER_WIN;
}
ConnectFour_popout_unpopWinCheck(cf, c);
}
}
if (ConnectFour_repetition(cf)) {
if (repetitionFlag) {
repetitionFlag = 0;
printf("%s (%d)\n", REPETITION_STRING, maxDepth - 1);
}
return -DRAW_WIN;
}
if (currDepth >= maxDepth) {
return -IN_PROGRESS;
}
rootScore = alpha;
for (c = 0; c < COLUMNS; ++c) {
if (ConnectFour_popout_drop(cf, moveOrder[c])) {
if ((branchScore = -AlphaBeta_negamax_popout_withMoves(cf, currDepth + 1, maxDepth, -beta, -alpha)) > rootScore) {
pv[currDepth] = moveOrder[c] + '1';
rootScore = branchScore;
}
ConnectFour_popout_undrop(cf);
if (alpha < rootScore) {
TranspositionTable_storeBounds(&table, (hashKey = ConnectFour_getHashKey(cf)), (alpha = rootScore), maxDepth, TT_LOWERBOUND);
}
if (alpha >= beta) {
return alpha;
}
}
}
for (c = 0; c < COLUMNS; ++c) {
if (ConnectFour_popout_pop(cf, moveOrder[c])) {
if ((branchScore = -AlphaBeta_negamax_popout_withMoves(cf, currDepth + 1, maxDepth, -beta, -alpha)) > rootScore) {
pv[currDepth] = moveOrder[c] + 'A';
rootScore = branchScore;
}
ConnectFour_popout_unpop(cf);
if (alpha < rootScore) {
TranspositionTable_storeBounds(&table, (hashKey = ConnectFour_getHashKey(cf)), (alpha = rootScore), maxDepth, TT_LOWERBOUND);
}
if (alpha >= beta) {
return alpha;
}
}
}
TranspositionTable_storeBounds(&table, (hashKey = ConnectFour_getHashKey(cf)), alpha, maxDepth, TT_UPPERBOUND);
return alpha;
}
int AlphaBeta_negamax_powerup(ConnectFour *cf, int depth, int alpha, int beta) {
int rootScore, branchScore;
unsigned c;
/*Position oldBoard[2] = { cf->board[0], cf->board[1] }, oldPowerCheckers[4] = { cf->pc->anvil, cf->pc->bomb, cf->pc->wall, cf->pc->x2 };
unsigned short oldPPC = cf->playedPowerCheckers, oldStatus = cf->pum[cf->plyNumber].status;*/
++nodes;
if (abs((tableScore = TranspositionTable_powerup_loadValue(&table, (hashKey = ConnectFour_getHashKey(cf)), hashKey ^ cf->pc->anvil, hashKey ^ cf->pc->bomb, hashKey ^ cf->pc->wall, hashKey ^ cf->pc->x2))) != IN_PROGRESS) {
if (TranspositionTable_powerup_depthEquality(&table, hashKey, hashKey ^ cf->pc->anvil, hashKey ^ cf->pc->bomb, hashKey ^ cf->pc->wall, hashKey ^ cf->pc->x2, depth)) {
return tableScore;
}
}
if (AlphaBeta_powerup_checkWin(cf)) {
return PLAYER_WIN;
}
if ((cf->board[0] ^ cf->board[1]) == ALL) {
return DRAW;
}
if (!depth) {
return -IN_PROGRESS;
}
rootScore = alpha;
for (c = 0; c < COLUMNS; ++c) {
if (ConnectFour_powerup_dropX2(cf, moveOrder[c])) {
if ((branchScore = AlphaBeta_negamax_powerup(cf, depth - 1, alpha, beta)) > rootScore) {
rootScore = branchScore;
}
ConnectFour_powerup_undropX2(cf);
/*assert(cf->board[0] == oldBoard[0] && cf->board[1] == oldBoard[1] &&
oldStatus == cf->pum[cf->plyNumber].status &&
oldPPC == cf->playedPowerCheckers &&
oldPowerCheckers[0] == cf->pc->anvil &&
oldPowerCheckers[1] == cf->pc->bomb &&
oldPowerCheckers[2] == cf->pc->wall &&
oldPowerCheckers[3] == cf->pc->x2);*/
if (alpha < rootScore) {
TranspositionTable_powerup_store(&table, (hashKey = ConnectFour_getHashKey(cf)), hashKey ^ cf->pc->anvil, hashKey ^ cf->pc->bomb, hashKey ^ cf->pc->wall, hashKey ^ cf->pc->x2, (alpha = rootScore), depth);
}
if (alpha >= beta) {
return alpha;
}
}
}
for (c = 0; c < COLUMNS; ++c) {
if (ConnectFour_powerup_dropWall(cf, moveOrder[c])) {
if ((branchScore = AlphaBeta_negamax_powerup(cf, depth - 1, alpha, beta)) > rootScore) {
rootScore = branchScore;
}
ConnectFour_powerup_undropWall(cf);
/*assert(cf->board[0] == oldBoard[0] && cf->board[1] == oldBoard[1] &&
oldStatus == cf->pum[cf->plyNumber].status &&
oldPPC == cf->playedPowerCheckers &&
oldPowerCheckers[0] == cf->pc->anvil &&
oldPowerCheckers[1] == cf->pc->bomb &&
oldPowerCheckers[2] == cf->pc->wall &&
oldPowerCheckers[3] == cf->pc->x2);*/
if (alpha < rootScore) {
TranspositionTable_powerup_store(&table, (hashKey = ConnectFour_getHashKey(cf)), hashKey ^ cf->pc->anvil, hashKey ^ cf->pc->bomb, hashKey ^ cf->pc->wall, hashKey ^ cf->pc->x2, (alpha = rootScore), depth);
}
if (alpha >= beta) {
return alpha;
}
}
}
for (c = 0; c < COLUMNS; ++c) {
if (ConnectFour_powerup_dropBomb(cf, moveOrder[c])) {
if ((branchScore = AlphaBeta_negamax_powerup(cf, depth - 1, alpha, beta)) > rootScore) {
rootScore = branchScore;
}
ConnectFour_powerup_undropBomb(cf);
/*assert(cf->board[0] == oldBoard[0] && cf->board[1] == oldBoard[1] &&
oldStatus == cf->pum[cf->plyNumber].status &&
oldPPC == cf->playedPowerCheckers &&
oldPowerCheckers[0] == cf->pc->anvil &&
oldPowerCheckers[1] == cf->pc->bomb &&
oldPowerCheckers[2] == cf->pc->wall &&
oldPowerCheckers[3] == cf->pc->x2);*/
if (alpha < rootScore) {
TranspositionTable_powerup_store(&table, (hashKey = ConnectFour_getHashKey(cf)), hashKey ^ cf->pc->anvil, hashKey ^ cf->pc->bomb, hashKey ^ cf->pc->wall, hashKey ^ cf->pc->x2, (alpha = rootScore), depth);
}
if (alpha >= beta) {
return alpha;
}
}
}
for (c = 0; c < COLUMNS; ++c) {
if (ConnectFour_powerup_pop(cf, moveOrder[c])) {
if ((branchScore = -AlphaBeta_negamax_powerup(cf, depth - 1, -beta, -alpha)) > rootScore) {
rootScore = branchScore;
}
ConnectFour_powerup_unpop(cf);
/*assert(cf->board[0] == oldBoard[0] && cf->board[1] == oldBoard[1] &&
oldStatus == cf->pum[cf->plyNumber].status &&
oldPPC == cf->playedPowerCheckers &&
oldPowerCheckers[0] == cf->pc->anvil &&
oldPowerCheckers[1] == cf->pc->bomb &&
oldPowerCheckers[2] == cf->pc->wall &&
oldPowerCheckers[3] == cf->pc->x2);*/
if (alpha < rootScore) {
TranspositionTable_powerup_store(&table, (hashKey = ConnectFour_getHashKey(cf)), hashKey ^ cf->pc->anvil, hashKey ^ cf->pc->bomb, hashKey ^ cf->pc->wall, hashKey ^ cf->pc->x2, (alpha = rootScore), depth);
}
if (alpha >= beta) {
return alpha;
}
}
}
for (c = 0; c < COLUMNS; ++c) {
if (ConnectFour_powerup_dropAnvil(cf, moveOrder[c])) {
if ((branchScore = -AlphaBeta_negamax_powerup(cf, depth - 1, -beta, -alpha)) > rootScore) {
rootScore = branchScore;
}
ConnectFour_powerup_undropAnvil(cf);
/*assert(cf->board[0] == oldBoard[0] && cf->board[1] == oldBoard[1] &&
oldStatus == cf->pum[cf->plyNumber].status &&
oldPPC == cf->playedPowerCheckers &&
oldPowerCheckers[0] == cf->pc->anvil &&
oldPowerCheckers[1] == cf->pc->bomb &&
oldPowerCheckers[2] == cf->pc->wall &&
oldPowerCheckers[3] == cf->pc->x2);*/
if (alpha < rootScore) {
TranspositionTable_powerup_store(&table, (hashKey = ConnectFour_getHashKey(cf)), hashKey ^ cf->pc->anvil, hashKey ^ cf->pc->bomb, hashKey ^ cf->pc->wall, hashKey ^ cf->pc->x2, (alpha = rootScore), depth);
}
if (alpha >= beta) {
return alpha;
}
}
}
for (c = 0; c < COLUMNS; ++c) {
if (ConnectFour_powerup_drop(cf, moveOrder[c])) {
if ((branchScore = -AlphaBeta_negamax_powerup(cf, depth - 1, -beta, -alpha)) > rootScore) {
rootScore = branchScore;
}
ConnectFour_powerup_undrop(cf);
/*assert(cf->board[0] == oldBoard[0] && cf->board[1] == oldBoard[1] &&
oldStatus == cf->pum[cf->plyNumber].status &&
oldPPC == cf->playedPowerCheckers &&
oldPowerCheckers[0] == cf->pc->anvil &&
oldPowerCheckers[1] == cf->pc->bomb &&
oldPowerCheckers[2] == cf->pc->wall &&
oldPowerCheckers[3] == cf->pc->x2);*/
if (alpha < rootScore) {
TranspositionTable_powerup_store(&table, (hashKey = ConnectFour_getHashKey(cf)), hashKey ^ cf->pc->anvil, hashKey ^ cf->pc->bomb, hashKey ^ cf->pc->wall, hashKey ^ cf->pc->x2, (alpha = rootScore), depth);
}
if (alpha >= beta) {
return alpha;
}
}
}
TranspositionTable_powerup_store(&table, (hashKey = ConnectFour_getHashKey(cf)), hashKey ^ cf->pc->anvil, hashKey ^ cf->pc->bomb, hashKey ^ cf->pc->wall, hashKey ^ cf->pc->x2, (alpha = rootScore), depth);
return alpha;
}
int AlphaBeta_negamax_popten(ConnectFour *cf, int depth, int alpha, int beta) {
int rootScore, branchScore;
unsigned m, l, sortedMove;
MoveSorter moveSorter;
++nodes;
if (abs((tableScore = TranspositionTable_popout_loadValue(&table, (hashKey = ConnectFour_getHashKey(cf))))) >= PLAYER_WIN) {
if (TranspositionTable_depthLessOrEqual(&table, hashKey, depth)) {
return tableScore;
}
}
if (AlphaBeta_popten_checkWin(cf)) {
return PLAYER_WIN;
}
if (AlphaBeta_popten_checkDraw(cf)) {
return DRAW;
}
if (!depth) {
return -IN_PROGRESS;
}
rootScore = alpha;
moveSorter.moveEntries = malloc(sizeof(struct MoveSorter_Entries) * (l = ConnectFour_numberLegalMoves(cf)));
moveSorter.size = 0;
if (ConnectFour_popten_pass(cf)) {
MoveSorter_addToEntry(&moveSorter, COLUMNS_X2_P1, 0);
ConnectFour_popten_unpass(cf);
}
else {
for (m = 0; m < COLUMNS; ++m) {
if (ConnectFour_popten_pop(cf, m)) {
switch(popTenFlags) {
case POPTEN_POP_NO_CONNECTION:
MoveSorter_addToEntry(&moveSorter, m + COLUMNS, 2);
break;
case POPTEN_POP_CONNECTION:
MoveSorter_addToEntry(&moveSorter, m + COLUMNS, 3);
}
ConnectFour_popten_unpop(cf);
}
if (ConnectFour_popten_drop(cf, m)) {
MoveSorter_addToEntry(&moveSorter, m, 1);
ConnectFour_popten_undrop(cf);
}
}
}
for (m = 0; m < l; ++m) {
sortedMove = moveSorter.moveEntries[m].move;
if (sortedMove < COLUMNS) {
ConnectFour_popten_drop(cf, sortedMove);
}
else if (sortedMove < COLUMNS_X2) {
ConnectFour_popten_pop(cf, sortedMove - COLUMNS);
}
else {
ConnectFour_popten_pass(cf);
}
if (popTenFlags == POPTEN_DROP || popTenFlags == POPTEN_PASS) {
// Whenever players make a pop that is not part of a four-in-a-row connection, the turn switches to their opponent; switch alpha-beta bounds accordingly
branchScore = -AlphaBeta_negamax_popten(cf, depth - 1, -beta, -alpha);
}
else {
// A pop belonging to a four-in-a-row connection means the player gains a turn; keep the alpha-beta bounds but increase in depth
branchScore = AlphaBeta_negamax_popten(cf, depth - 1, alpha, beta);
}
if (branchScore > rootScore) {
rootScore = branchScore;
}
if (sortedMove < COLUMNS) {
ConnectFour_popten_undrop(cf);
}
else if (sortedMove < COLUMNS_X2) {
ConnectFour_popten_unpop(cf);
}
else {
ConnectFour_popten_unpass(cf);
}
if (alpha < rootScore) {
TranspositionTable_store(&table, (hashKey = ConnectFour_getHashKey(cf)), (alpha = rootScore), depth);
}
if (alpha >= beta) {
free(moveSorter.moveEntries);
return alpha;
}
}
free(moveSorter.moveEntries);
TranspositionTable_store(&table, (hashKey = ConnectFour_getHashKey(cf)), alpha, depth);
return alpha;
}
int AlphaBeta_negamax_popten_withMoves(ConnectFour *cf, int currDepth, int maxDepth, int alpha, int beta) {
int rootScore, branchScore;
unsigned m, l, sortedMove;
MoveSorter moveSorter;
++nodes;
if ((tableScore = TranspositionTable_popout_loadValue(&table, (hashKey = ConnectFour_getHashKey(cf)))) != TT_POPOUT_UNKNOWN) {
if (TranspositionTable_depthGreaterOrEqual(&table, hashKey, maxDepth)) {
switch (TranspositionTable_loadBounds(&table, hashKey)) {
case TT_LOWERBOUND:
if (alpha < tableScore) {
alpha = tableScore;
}
if (alpha >= beta) {
return alpha;
}
break;
case TT_UPPERBOUND:
if (beta > tableScore) {
beta = tableScore;
}
if (alpha >= beta) {
return beta;
}
}
}
}
if (AlphaBeta_popten_checkWin(cf)) {
return PLAYER_WIN;
}
if (AlphaBeta_popten_checkDraw(cf)) {
return DRAW;
}
if (currDepth >= maxDepth) {
return -IN_PROGRESS;
}
rootScore = alpha;
moveSorter.moveEntries = malloc(sizeof(struct MoveSorter_Entries) * (l = ConnectFour_numberLegalMoves(cf)));
moveSorter.size = 0;
if (ConnectFour_popten_pass(cf)) {
MoveSorter_addToEntry(&moveSorter, COLUMNS_X2_P1, 0);
ConnectFour_popten_unpass(cf);
}
else {
for (m = 0; m < COLUMNS; ++m) {
if (ConnectFour_popten_pop(cf, m)) {
switch(popTenFlags) {
case POPTEN_POP_NO_CONNECTION:
MoveSorter_addToEntry(&moveSorter, m + COLUMNS, 2);
break;
case POPTEN_POP_CONNECTION:
MoveSorter_addToEntry(&moveSorter, m + COLUMNS, 3);
}
ConnectFour_popten_unpop(cf);
}
if (ConnectFour_popten_drop(cf, m)) {
MoveSorter_addToEntry(&moveSorter, m, 1);
ConnectFour_popten_undrop(cf);
}
}
}
for (m = 0; m < l; ++m) {
sortedMove = moveSorter.moveEntries[m].move;
if (sortedMove < COLUMNS) {
ConnectFour_popten_drop(cf, sortedMove);
}
else if (sortedMove < COLUMNS_X2) {
ConnectFour_popten_pop(cf, sortedMove - COLUMNS);
}
else {
ConnectFour_popten_pass(cf);
}
if (popTenFlags == POPTEN_DROP || popTenFlags == POPTEN_PASS) {
branchScore = -AlphaBeta_negamax_popten_withMoves(cf, currDepth + 1, maxDepth, -beta, -alpha);
}
else {
branchScore = AlphaBeta_negamax_popten_withMoves(cf, currDepth + 1, maxDepth, alpha, beta);
}
if (branchScore > rootScore) {
rootScore = branchScore;
if (sortedMove < COLUMNS) {
pv[currDepth] = sortedMove + '1';
}
else if (sortedMove < COLUMNS_X2) {
pv[currDepth] = sortedMove + 'A' - COLUMNS;
}
else {
pv[currDepth] = 'P';
}
}
if (sortedMove < COLUMNS) {
ConnectFour_popten_undrop(cf);
}
else if (sortedMove < COLUMNS_X2) {
ConnectFour_popten_unpop(cf);
}
else {
ConnectFour_popten_unpass(cf);
}
if (alpha < rootScore) {
TranspositionTable_storeBounds(&table, (hashKey = ConnectFour_getHashKey(cf)), (alpha = rootScore), maxDepth, TT_LOWERBOUND);
}
if (alpha >= beta) {
free(moveSorter.moveEntries);
return alpha;
}
}
free(moveSorter.moveEntries);
TranspositionTable_storeBounds(&table, (hashKey = ConnectFour_getHashKey(cf)), alpha, maxDepth, TT_UPPERBOUND);
return alpha;
}
void AlphaBeta_normal_getMoveScores(ConnectFour *cf, Result *result, Result *best, bool out) {
if (!ConnectFour_gameOver(cf)) {
Result *results = malloc(sizeof(Result) * COLUMNS);
bool isSymmetric = ConnectFour_symmetrical(cf->board[0]) && ConnectFour_symmetrical(cf->board[1]), madeMove = false;
unsigned c, cols = isSymmetric ? COLUMNS & 1 ? (COLUMNS >> 1) + 1 : COLUMNS >> 1 : COLUMNS;
for (c = 0; c < COLUMNS; ++c) {
results[c].wdl = (char)UNKNOWN_CHAR;
}
if (GAME_VARIANT == POWERUP_VARIANT) {
printf("normal: ");
}
for (c = 0; c < cols; ++c) {
#ifdef __unix__ // The standard output is line buffered on Linux. It has no effect on Windows since the standard output is not line buffered.
fflush(stdout);
#endif
switch (GAME_VARIANT) {
case POPOUT_VARIANT:
madeMove = ConnectFour_popout_drop(cf, c);
break;
case POWERUP_VARIANT:
madeMove = ConnectFour_powerup_drop(cf, c);
break;
default:
madeMove = ConnectFour_normal_drop(cf, c);
}
if (madeMove) {
if (ConnectFour_connection(cf->board[!(cf->plyNumber & 1)])) {
results[c] = (Result){ WIN_CHAR, 0 };
if (isSymmetric) {
results[COLUMNS - 1 - c].wdl = results[c].wdl;
results[COLUMNS - 1 - c].dtc = results[c].dtc;
}
}
else {
TranspositionTable_dynamicReset(&table, tableSize);
if (GAME_VARIANT == POPOUT_VARIANT) {
ConnectFour_clearHistory(cf);
}
switch (GAME_VARIANT) {
case POPOUT_VARIANT:
results[c] = AlphaBeta_popout_solve(cf, false);
break;
case POWERUP_VARIANT:
results[c] = AlphaBeta_powerup_solve(cf, false);
break;
default:
results[c] = AlphaBeta_normal_solve(cf, false);
}
Result_increment(&results[c]);
if (isSymmetric) {
results[COLUMNS - 1 - c].wdl = results[c].wdl;
results[COLUMNS - 1 - c].dtc = results[c].dtc;
}
}
switch (GAME_VARIANT) {
case POPOUT_VARIANT:
ConnectFour_popout_undrop(cf);
break;
case POWERUP_VARIANT:
ConnectFour_powerup_undrop(cf);
break;
default:
ConnectFour_normal_undrop(cf);
}
}
if (out) {
Result_print(&results[c], best);
}
}
if (isSymmetric && out) {
for (; c < COLUMNS; ++c) {
Result_print(&results[c], best);
}
}
if (result) {
for (c = 0; c < COLUMNS; ++c) {
result[c] = results[c];
}
}
free(results);
}
}
void AlphaBeta_popout_getMoveScores(ConnectFour *cf, Result *result, Result *best, bool out) {
AlphaBeta_normal_getMoveScores(cf, result, best, out);
puts("");
if (!ConnectFour_gameOver(cf)) {
Result *results = malloc(sizeof(Result) * COLUMNS);
bool isSymmetric = ConnectFour_symmetrical(cf->board[0]) && ConnectFour_symmetrical(cf->board[1]);
unsigned c, cols = isSymmetric ? COLUMNS & 1 ? (COLUMNS >> 1) + 1 : COLUMNS >> 1 : COLUMNS;
for (c = 0; c < COLUMNS; ++c) {
results[c].wdl = (char)UNKNOWN_CHAR;
}
for (c = 0; c < cols; ++c) {
#ifdef __unix__
fflush(stdout);
#endif
if (ConnectFour_popout_pop(cf, c)) {
if (ConnectFour_connectionNoVertical(cf->board[!(cf->plyNumber & 1)])) {
results[c] = (Result){ WIN_CHAR, 0 };
if (isSymmetric) {
results[COLUMNS - 1 - c].wdl = results[c].wdl;
results[COLUMNS - 1 - c].dtc = results[c].dtc;
}
}
else if (ConnectFour_connectionNoVertical(cf->board[cf->plyNumber & 1])) {
results[c] = (Result){ LOSS_CHAR, 0 };
if (isSymmetric) {
results[COLUMNS - 1 - c].wdl = results[c].wdl;
results[COLUMNS - 1 - c].dtc = results[c].dtc;
}
}
else {
TranspositionTable_dynamicReset(&table, tableSize);
ConnectFour_clearHistory(cf);
results[c] = AlphaBeta_popout_solve(cf, false);
Result_increment(&results[c]);
if (isSymmetric) {
results[COLUMNS - 1 - c].wdl = results[c].wdl;
results[COLUMNS - 1 - c].dtc = results[c].dtc;
}
}
ConnectFour_popout_unpop(cf);
}
if (out) {
Result_print(&results[c], best);
}
}
if (isSymmetric && out) {
for (; c < COLUMNS; ++c) {
Result_print(&results[c], best);
}
}
if (result) {
for (c = COLUMNS; c < COLUMNS_X2; ++c) {
result[c] = results[c - COLUMNS];
}
}
free(results);
}
}
void AlphaBeta_powerup_getMoveScores(ConnectFour *cf, Result *result, Result *best, bool out) {
AlphaBeta_normal_getMoveScores(cf, result, best, out);
puts("");
if (!ConnectFour_gameOver(cf)) {
Result *anvilResults, *bombResults, *wallResults, *x2Results;
bool isSymmetric = ConnectFour_symmetrical(cf->board[0]) && ConnectFour_symmetrical(cf->board[1]);
unsigned c, cols = isSymmetric ? COLUMNS & 1 ? (COLUMNS >> 1) + 1 : COLUMNS >> 1 : COLUMNS;
anvilResults = malloc(sizeof(Result) * COLUMNS);
bombResults = malloc(sizeof(Result) * COLUMNS);
wallResults = malloc(sizeof(Result) * COLUMNS);
x2Results = malloc(sizeof(Result) * COLUMNS);
printf("anvil: ");
for (c = 0; c < cols; ++c) {
#ifdef __unix__
fflush(stdout);
#endif
if (ConnectFour_powerup_dropAnvil(cf, c)) {
if (ConnectFour_connectionNoVertical(cf->board[!(cf->plyNumber & 1)])) {
anvilResults[c] = (Result){ WIN_CHAR, 0 };
if (isSymmetric) {
anvilResults[COLUMNS - 1 - c].wdl = anvilResults[c].wdl;
anvilResults[COLUMNS - 1 - c].dtc = anvilResults[c].dtc;
}
}
else {
TranspositionTable_dynamicReset(&table, tableSize);
anvilResults[c] = AlphaBeta_powerup_solve(cf, false);
Result_increment(&anvilResults[c]);
if (isSymmetric) {
anvilResults[COLUMNS - 1 - c].wdl = anvilResults[c].wdl;
anvilResults[COLUMNS - 1 - c].dtc = anvilResults[c].dtc;
}
}
ConnectFour_powerup_undropAnvil(cf);
}
if (out) {
Result_print(&anvilResults[c], best);
}
}
if (isSymmetric && out) {
for (; c < COLUMNS; ++c) {
Result_print(&anvilResults[c], best);
}
}
printf("\nbomb: ");
for (c = 0; c < COLUMNS; ++c) {
#ifdef __unix__
fflush(stdout);
#endif
if (ConnectFour_powerup_dropBomb(cf, c)) {
if (ConnectFour_connection(cf->board[cf->plyNumber & 1])) {