public double Evaluate(Position position)
{
double score = (position.Board.WhiteKing.PopCount() - position.Board.BlackKing.PopCount()) * 200
+ (position.Board.WhiteQueens.PopCount() - position.Board.BlackQueens.PopCount()) * 9
+ (position.Board.WhiteRooks.PopCount() - position.Board.BlackRooks.PopCount()) * 5
+ (position.Board.WhiteBishops.PopCount() - position.Board.BlackBishops.PopCount()) * 3
+ (position.Board.WhiteKnights.PopCount() - position.Board.BlackKnights.PopCount()) * 3
+ (position.Board.WhitePawns.PopCount() - position.Board.BlackPawns.PopCount()) * 1;
int totalMovesAvailable = MoveGenerator.GetAllMoves(position, onlyLegal: true).Count;
int enemyMovesAvailable = MoveGenerator.GetAllMoves(position with {
SideToMove = position.OpposingSide
}, onlyLegal: true).Count;
score += 0.1 * (totalMovesAvailable - enemyMovesAvailable);
if (position.SideToMove == Side.White)
{
return(score);
}
else
{
return(-1 * score);
}
}
public void GeneratesCorrectNumberOfMovesForPositionWithPossiblePromotions()
{
// Assemble
var position = Position.FromFENString("rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPP1NnPP/RNBQK2R w KQ - 1 8");
// Act
var moves = MoveGenerator.GetAllMoves(position);
// Assert
moves.Should().HaveCount(44);
}
public void GeneratesCorrectNumberOfMovesForPositionWithPossibleIllegalMoves()
{
// Assemble
var position = Position.FromFENString("8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - -");
// Act
var moves = MoveGenerator.GetAllMoves(position);
// Assert
moves.Should().HaveCount(14);
moves.Where(m => m.IsCapture).Should().HaveCount(1);
}
public void GeneratesCorrectNumberOfMovesForKiwiPetePosition()
{
// Assemble
var position = Position.FromFENString("r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -");
// Act
var moves = MoveGenerator.GetAllMoves(position);
// Assert
moves.Should().HaveCount(48);
moves.Where(m => m.IsCapture).Should().HaveCount(8);
}
public void CanIdentifyAllCastleMovesBlack()
{
// Assemble
var position = Position.FromFENString("r3k2r/8/8/8/8/8/8/R3K2R b KQkq - 0 1 ");
// Act
var moves = MoveGenerator.GetAllMoves(position);
// Assert
var castlingMoves = new[]
{
new Move(Square.e8, Square.g8, MoveFlags.KingCastle),
new Move(Square.e8, Square.c8, MoveFlags.QueenCastle)
};
moves.Should().Contain(castlingMoves);
}
public void CanGetMovesForPositionWithEnpassantWhite()
{
// Assemble
var board = new Board
{
WhitePawns = 0x00_00_00_04_00_00_00_00,
BlackPawns = 0x00_00_00_08_00_00_00_00
};
var position = new Position(board, Side.White, Square.d6, CastlingRights.None, 0);
// Act
var moves = MoveGenerator.GetAllMoves(position);
// Assert
moves.Should().HaveCount(2);
moves.Where(m => m.Flags == MoveFlags.EnPassantCapture).Should().HaveCount(1);
}
public void CanGeneratePawnMovesForPositionBlack()
{
// Assemble
var board = new Board
{
WhitePawns = 0x00_00_00_01_04_0a_f0_00,
BlackPawns = 0x00_00_1d_82_40_20_00_00
};
var position = new Position(board, Side.Black, null, CastlingRights.None, 0);
// Act
var moves = MoveGenerator.GetAllMoves(position);
// Assert
moves.Should().HaveCount(9);
moves.Where(m => (m.Flags & MoveFlags.Capture) != 0).Should().HaveCount(3);
}
public void CanGeneratePawnMovesForBasicPosition()
{
// Assemble
var board = new Board
{
WhitePawns = 0x00_00_00_00_00_00_ff_00,
BlackPawns = 0x00_00_00_00_00_14_00_00
};
var position = new Position(board, Side.White, null, CastlingRights.None, 0);
// Act
var moves = MoveGenerator.GetAllMoves(position);
// Assert
moves.Should().HaveCount(16);
moves.Where(m => (m.Flags & MoveFlags.Capture) != 0).Should().HaveCount(4);
}
public void CanGeneratePawnMovesForBasicPositionWithPromotions()
{
// Assemble
var board = new Board
{
WhitePawns = 0x00_12_20_00_00_00_00_00,
BlackQueens = 0x08_00_00_00_00_00_00_00
};
var position = new Position(board, Side.White, null, CastlingRights.None, 0);
// Act
var moves = MoveGenerator.GetAllMoves(position);
// Assert
moves.Should().HaveCount(13);
moves.Where(m => m.IsCapture).Should().HaveCount(4);
moves.Where(m => m.IsPromotion).Should().HaveCount(12);
}
public void GeneratesAllStandardPromotions()
{
// Assemble
var position = Position.FromFENString("rnb2k1r/pp1Pbppp/2p5/8/2B5/8/PPP1NnPP/RNBQK2R w - - 0 1 ");
// Act
var moves = MoveGenerator.GetAllMoves(position);
// Assert
var promotionMoves = new[]
{
new Move(Square.d7, Square.d8, MoveFlags.KnightPromotion),
new Move(Square.d7, Square.d8, MoveFlags.BishopPromotion),
new Move(Square.d7, Square.d8, MoveFlags.QueenPromotion),
new Move(Square.d7, Square.d8, MoveFlags.RookPromotion),
};
moves.Should().Contain(promotionMoves);
}
public void GeneratesAllCapturePromotions()
{
// Assemble
var position = Position.FromFENString("rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPP1NnPP/RNBQK2R w KQ - 1 8");
// Act
var moves = MoveGenerator.GetAllMoves(position);
// Assert
var promotionMoves = new[]
{
new Move(Square.d7, Square.c8, MoveFlags.Capture | MoveFlags.KnightPromotion, Piece.Bishop),
new Move(Square.d7, Square.c8, MoveFlags.Capture | MoveFlags.BishopPromotion, Piece.Bishop),
new Move(Square.d7, Square.c8, MoveFlags.Capture | MoveFlags.QueenPromotion, Piece.Bishop),
new Move(Square.d7, Square.c8, MoveFlags.Capture | MoveFlags.RookPromotion, Piece.Bishop),
};
moves.Should().Contain(promotionMoves);
}
public void GeneratesCorrectMovesForStartingPosition()
{
// Assemble
var position = new Position(Board.StartingPosition, Side.White, null, CastlingRights.All, 0);
// Act
var moves = MoveGenerator.GetAllMoves(position);
// Assert
var expectedMoves = new List <Move>
{
new Move(Square.a2, Square.a3, MoveFlags.QuietMove),
new Move(Square.b2, Square.b3, MoveFlags.QuietMove),
new Move(Square.c2, Square.c3, MoveFlags.QuietMove),
new Move(Square.d2, Square.d3, MoveFlags.QuietMove),
new Move(Square.e2, Square.e3, MoveFlags.QuietMove),
new Move(Square.f2, Square.f3, MoveFlags.QuietMove),
new Move(Square.g2, Square.g3, MoveFlags.QuietMove),
new Move(Square.h2, Square.h3, MoveFlags.QuietMove),
new Move(Square.a2, Square.a4, MoveFlags.DoublePawnPush),
new Move(Square.b2, Square.b4, MoveFlags.DoublePawnPush),
new Move(Square.c2, Square.c4, MoveFlags.DoublePawnPush),
new Move(Square.d2, Square.d4, MoveFlags.DoublePawnPush),
new Move(Square.e2, Square.e4, MoveFlags.DoublePawnPush),
new Move(Square.f2, Square.f4, MoveFlags.DoublePawnPush),
new Move(Square.g2, Square.g4, MoveFlags.DoublePawnPush),
new Move(Square.h2, Square.h4, MoveFlags.DoublePawnPush),
new Move(Square.b1, Square.a3, MoveFlags.QuietMove),
new Move(Square.b1, Square.c3, MoveFlags.QuietMove),
new Move(Square.g1, Square.f3, MoveFlags.QuietMove),
new Move(Square.g1, Square.h3, MoveFlags.QuietMove),
};
moves.Should().BeEquivalentTo(expectedMoves);
}
