long MainPlayer::potentialMobilityHeuristic(const GameBoard &gameBoard, Tile tile) {
long potentialMobility = 0;
auto gameSize = gameBoard.getGameSize();
auto enemyTile = gameBoard.getEnemyTile(tile);
for (size_t row = 0; row < gameSize; ++row) {
for (size_t column = 0; column < gameSize; ++column) {
Cell here(row, column);
if (gameBoard.getAt(here) != tile) {
continue;
}
for (int offsetRow = -1; offsetRow < 2; ++offsetRow) {
for (int offsetCol = -1; offsetCol < 2; ++offsetCol) {
if (offsetCol == 0 && offsetRow == 0) {
continue;
}
Direction direction(offsetRow, offsetCol);
auto neighbor = here;
neighbor.move(direction);
if (gameBoard.isCorrect(neighbor)
&& gameBoard.getAt(neighbor) == enemyTile) {
++potentialMobility;
}
}
}
}
}
return potentialMobility;
}
long MainPlayer::evaluateGameBoard(const GameBoard &gameBoard, Tile tile) const {
long value = 0;
auto gameSize = gameBoard.getGameSize();
auto enemyTile = gameBoard.getEnemyTile(tile);
if (gameBoard.getEmptyCount() < 10) {
edgeStabilityHeuristic(gameBoard, tile);
}
if (gameBoard.isGameOver()) {
Score score = gameBoard.calculateScore();
if (gameBoard.whoWins() == tile) {
return 77777 + score.playersScore(tile) * 100;
}
if (gameBoard.whoWins() == enemyTile) {
return -77777 - score.playersScore(enemyTile) * 100;
}
}
long cornerValue = 0;
for (size_t row = 0; row < gameSize; ++row) {
for (size_t column = 0; column < gameSize; ++column) {
if (gameBoard.getAt(row, column) == tile) {
cornerValue += worth[row][column];
}
}
}
if (gamePhase == GAME_BEGIN) {
value = (long) (cornerValue * 2 + 1 * mobilityHeuristic(gameBoard, tile) +
edgeStabilityHeuristic(gameBoard, tile) * 0.5);
}
if (gamePhase == GAME_MIDDLE) {
value = cornerValue * 2 + mobilityHeuristic(gameBoard, tile) + edgeStabilityHeuristic(gameBoard, tile);
}
if (gamePhase == GAME_PREEND || gamePhase == GAME_END) {
value = (long) (cornerValue + 0.5 * mobilityHeuristic(gameBoard, tile) +
edgeStabilityHeuristic(gameBoard, tile) * 1.5);
}
return value;
}
