/**
* Generates random squares for the pieces of the provided tablebase.
*
* @param tablebase computerized database containing all possible legal chess positions and their
* evaluations, given the set of specific chess pieces
* @return the bidirectional map from the pieces present in this chess position, to the squares
* they occupy
*/
static BiMap<Piece, Square> generateRandomSquaresForPieces(Tablebase tablebase) {
BiMap<Piece, Square> piecesWithSquares = EnumBiMap.create(Piece.class, Square.class);
List<Piece> pieces = tablebase.getAllPieces();
MersenneTwisterFast numberGenerator = new MersenneTwisterFast();
Square randSquare = null;
for (Piece piece : pieces) {
do {
if (piece.getPieceType() == PieceType.PAWN) {
int pRand = numberGenerator.nextInt(Squares.PAWN_SQUARES.numberOfSquares());
randSquare = Squares.PAWN_SQUARES.getSquaresAsList().get(pRand);
} else {
int allRand = numberGenerator.nextInt(Squares.ALL_SQUARES.numberOfSquares());
randSquare = Squares.ALL_SQUARES.getSquaresAsList().get(allRand);
}
} while (piecesWithSquares.containsValue(randSquare));
piecesWithSquares.put(piece, randSquare);
}
return piecesWithSquares;
}
