private void testEnPassant()
{
// simulate for white and black side
for (int dfwColorValue = 0; dfwColorValue < 2; dfwColorValue++)
{
var dfwColor = (ChessColor)dfwColorValue;
var epColor = dfwColor.Opponent();
// get the column where the peasant is moving foreward
for (int fwCol = 0; fwCol < 8; fwCol++)
{
int dfwRow = (dfwColor == ChessColor.White) ? 1 : 6;
int attRow = (dfwColor == ChessColor.White) ? 3 : 4;
var dfwOldPos = new ChessPosition(dfwRow, fwCol);
var dfwNewPos = new ChessPosition(attRow, fwCol);
// get the column where the en-passant peasant is placed
for (int attCol = 0; attCol < 8; attCol++)
{
if (fwCol != attCol)
{
var attOldPos = new ChessPosition(attRow, attCol);
var attNewPos = new ChessPosition(attRow + ((dfwColor == ChessColor.White) ? -1 : 1), fwCol);
var pieces = new List <ChessPieceAtPos>()
{
new ChessPieceAtPos(dfwOldPos, new ChessPiece(ChessPieceType.Peasant, dfwColor, false)),
new ChessPieceAtPos(attOldPos, new ChessPiece(ChessPieceType.Peasant, epColor, true)),
new ChessPieceAtPos(new ChessPosition(0, 4), new ChessPiece(ChessPieceType.King, ChessColor.White, false)),
new ChessPieceAtPos(new ChessPosition(7, 4), new ChessPiece(ChessPieceType.King, ChessColor.Black, false)),
};
// apply the double foreward draw as preparation for the en-passant
IChessBoard board = new ChessBoard(pieces);
var drawDfw = new ChessDraw(board, dfwOldPos, dfwNewPos);
board = board.ApplyDraw(drawDfw);
// create the en-passant draw and validate it
var drawEp = new ChessDraw(board, attOldPos, attNewPos);
bool shouldDrawBeValid = Math.Abs(attCol - fwCol) == 1;
bool isDrawValid = drawEp.IsValid(board, drawDfw);
Assert.True(shouldDrawBeValid == isDrawValid);
if (shouldDrawBeValid)
{
// check if the en-passant draw gets correctly applied to the chess board
board = board.ApplyDraw(drawEp);
Assert.True(!board.IsCapturedAt(dfwNewPos) && board.GetPieceAt(attNewPos) == pieces[1].Piece);
}
}
}
}
}
}
private void testCatchDraws()
{
// simulate for white and black side for each ally and target chess pieces
for (int colorValues = 0; colorValues < 4; colorValues++)
{
var allyColor = (ChessColor)(colorValues / 2);
var targetColor = (ChessColor)(colorValues % 2);
// check for all rows on the chess board
for (int rowDiff = 0; rowDiff < 6; rowDiff++)
{
int allyRow = (allyColor == ChessColor.White) ? (1 + rowDiff) : (6 - rowDiff);
int nextRow = (allyColor == ChessColor.White) ? (allyRow + 1) : (allyRow - 1);
// get the column where the peasant is moving foreward
for (int allyCol = 0; allyCol < 8; allyCol++)
{
var oldPos = new ChessPosition(allyRow, allyCol);
for (int targetColMiddle = 1; targetColMiddle < 7; targetColMiddle++)
{
var targetPosLeft = new ChessPosition(nextRow, targetColMiddle - 1);
var targetPosRight = new ChessPosition(nextRow, targetColMiddle + 1);
var allyPeasant = new ChessPiece(ChessPieceType.Peasant, allyColor, true);
var enemyPeasant = new ChessPiece(ChessPieceType.Peasant, targetColor, true);
int kingsRow = (allyColor == ChessColor.White) ? 0 : 7;
var pieces = new List <ChessPieceAtPos>()
{
new ChessPieceAtPos(oldPos, allyPeasant),
new ChessPieceAtPos(targetPosLeft, enemyPeasant),
new ChessPieceAtPos(targetPosRight, enemyPeasant),
new ChessPieceAtPos(new ChessPosition(kingsRow, 0), new ChessPiece(ChessPieceType.King, ChessColor.White, false)),
new ChessPieceAtPos(new ChessPosition(kingsRow, 7), new ChessPiece(ChessPieceType.King, ChessColor.Black, false)),
};
//output.WriteLine($"current constellation: allyColor={allyColor}, targetColor={targetColor}, allyRow={allyRow}, allyCol={allyCol}, targetColMiddle={targetColMiddle}");
IChessBoard board = new ChessBoard(pieces);
var catchDraws = ChessDrawGenerator.Instance.GetDraws(board, oldPos, null, true).Where(x => x.OldPosition.Column != x.NewPosition.Column);
int expectedCatchDrawsCount = (targetColor == allyColor) ? 0 : (targetColMiddle == allyCol) ? 2 : ((Math.Abs(targetColMiddle - allyCol) == 2) ? 1 : 0);
expectedCatchDrawsCount = ((rowDiff == 5) ? 4 : 1) * expectedCatchDrawsCount;
Assert.True(catchDraws.Count() == expectedCatchDrawsCount);
// check if the draws are correctly applied to the chess board
foreach (var draw in catchDraws)
{
board = new ChessBoard(pieces);
board = board.ApplyDraw(draw);
var pieceCmp = new ChessPiece(ChessPieceType.Peasant, allyColor, true);
Assert.True(!board.IsCapturedAt(draw.OldPosition) && (board.GetPieceAt(draw.NewPosition) == pieceCmp || (rowDiff == 5)));
}
}
}
}
}
}
public void BishopDrawsTest()
{
// test draws of white / black bishops
for (int colorValue = 0; colorValue < 2; colorValue++)
{
var allyColor = (ChessColor)colorValue;
var enemyColor = allyColor.Opponent();
var bishopPos = new ChessPosition(4, 4);
var pieces = new List <ChessPieceAtPos>()
{
new ChessPieceAtPos(bishopPos, new ChessPiece(ChessPieceType.Bishop, allyColor, true)),
new ChessPieceAtPos(new ChessPosition(0, 0), new ChessPiece(ChessPieceType.Queen, allyColor, true)),
new ChessPieceAtPos(new ChessPosition(7, 7), new ChessPiece(ChessPieceType.Knight, allyColor, true)),
new ChessPieceAtPos(new ChessPosition(0, 6), new ChessPiece(ChessPieceType.King, allyColor, true)),
new ChessPieceAtPos(new ChessPosition(6, 2), new ChessPiece(ChessPieceType.Bishop, enemyColor, true)),
new ChessPieceAtPos(new ChessPosition(1, 7), new ChessPiece(ChessPieceType.Knight, enemyColor, true)),
new ChessPieceAtPos(new ChessPosition(7, 4), new ChessPiece(ChessPieceType.King, enemyColor, true)),
};
IChessBoard board = new ChessBoard(pieces);
var draws = ChessDrawGenerator.Instance.GetDraws(board, bishopPos, null, true);
Assert.True(draws.Count() == 10);
// check if the draws are correctly applied to the chess board
foreach (var draw in draws)
{
board = new ChessBoard(pieces);
board = board.ApplyDraw(draw);
var pieceCmp = new ChessPiece(ChessPieceType.Bishop, allyColor, true);
Assert.True(!board.IsCapturedAt(draw.OldPosition) && board.GetPieceAt(draw.NewPosition) == pieceCmp);
}
}
}
private void testPeasantPromotion()
{
// simulate for white and black side
for (int colorValue = 0; colorValue < 2; colorValue++)
{
var allyColor = (ChessColor)colorValue;
var enemyColor = allyColor.Opponent();
// go through all columns where the promoting peasant is moving foreward
for (int fwCol = 0; fwCol < 8; fwCol++)
{
int fwRow = (allyColor == ChessColor.White) ? 6 : 1;
var fwPos = new ChessPosition(fwRow, fwCol);
var pieces = new List <ChessPieceAtPos>()
{
new ChessPieceAtPos(new ChessPosition(4, 0), new ChessPiece(ChessPieceType.King, ChessColor.White, true)),
new ChessPieceAtPos(new ChessPosition(4, 7), new ChessPiece(ChessPieceType.King, ChessColor.Black, true)),
new ChessPieceAtPos(fwPos, new ChessPiece(ChessPieceType.Peasant, allyColor, true)),
};
int catchRow = (allyColor == ChessColor.White) ? 7 : 0;
int leftCatchCol = fwCol - 1;
int rightCatchCol = fwCol + 1;
var enemyPeasant = new ChessPiece(ChessPieceType.Peasant, enemyColor, true);
ChessPosition posCatchLeft;
ChessPosition posCatchRight;
if (ChessPosition.AreCoordsValid(catchRow, leftCatchCol))
{
posCatchLeft = new ChessPosition(catchRow, leftCatchCol);
pieces.Add(new ChessPieceAtPos(posCatchLeft, enemyPeasant));
}
if (ChessPosition.AreCoordsValid(catchRow, rightCatchCol))
{
posCatchRight = new ChessPosition(catchRow, rightCatchCol);
pieces.Add(new ChessPieceAtPos(posCatchRight, enemyPeasant));
}
IChessBoard board = new ChessBoard(pieces);
var draws = ChessDrawGenerator.Instance.GetDraws(board, fwPos, null, true);
Assert.True(draws.Count() == (4 * ((fwCol % 7 == 0) ? 2 : 3)));
foreach (var draw in draws)
{
board = new ChessBoard(pieces);
board = board.ApplyDraw(draw);
Assert.True(board.AllPieces.All(x => x.Piece.Color == enemyColor || x.Piece.Type != ChessPieceType.Peasant));
}
}
}
}
public void KnightDrawsTest()
{
// test draws of white / black knights
for (int colorValue = 0; colorValue < 2; colorValue++)
{
var allyColor = (ChessColor)colorValue;
var enemyColor = allyColor.Opponent();
var knightPositions = new List <ChessPosition>()
{
new ChessPosition(1, 2),
new ChessPosition(2, 6),
new ChessPosition(6, 4),
new ChessPosition(5, 1),
};
// go through all knight positions (including positions at the margin of the chess board, etc.)
foreach (var knightPos in knightPositions)
{
var pieces = new List <ChessPieceAtPos>()
{
new ChessPieceAtPos(knightPos, new ChessPiece(ChessPieceType.Knight, allyColor, true)),
new ChessPieceAtPos(new ChessPosition(4, 3), new ChessPiece(ChessPieceType.Peasant, allyColor, true)),
new ChessPieceAtPos(new ChessPosition(0, 7), new ChessPiece(ChessPieceType.Rook, allyColor, true)),
new ChessPieceAtPos(new ChessPosition(0, 4), new ChessPiece(ChessPieceType.King, allyColor, true)),
new ChessPieceAtPos(new ChessPosition(4, 7), new ChessPiece(ChessPieceType.Peasant, enemyColor, true)),
new ChessPieceAtPos(new ChessPosition(7, 2), new ChessPiece(ChessPieceType.Queen, enemyColor, true)),
new ChessPieceAtPos(new ChessPosition(6, 5), new ChessPiece(ChessPieceType.King, enemyColor, true)),
};
IChessBoard board = new ChessBoard(pieces);
var draws = ChessDrawGenerator.Instance.GetDraws(board, knightPos, null, true);
Assert.True(draws.Count() == 5);
// check if the draws are correctly applied to the chess board
foreach (var draw in draws)
{
board = new ChessBoard(pieces);
board = board.ApplyDraw(draw);
var pieceCmp = new ChessPiece(ChessPieceType.Knight, allyColor, true);
Assert.True(!board.IsCapturedAt(draw.OldPosition) && board.GetPieceAt(draw.NewPosition) == pieceCmp);
}
}
}
}
public void RookDrawsTest()
{
// check if only draws are computed where the destination is actually on the chess board
// and also make sure that only enemy pieces are taken (blocking allied pieces not)
for (int run = 0; run < 4; run++)
{
// get the (row, column) of the white queen
int row = run / 2 == 0 ? 0 : 7;
int col = run % 2 == 0 ? 0 : 7;
// test draws of white / black rooks
for (int colorValue = 0; colorValue < 2; colorValue++)
{
var allyColor = (ChessColor)colorValue;
var enemyColor = allyColor.Opponent();
var pieces = new List <ChessPieceAtPos>()
{
new ChessPieceAtPos(new ChessPosition(row, col), new ChessPiece(ChessPieceType.Rook, allyColor, true)),
new ChessPieceAtPos(new ChessPosition(0, 3), new ChessPiece(ChessPieceType.Bishop, allyColor, true)),
new ChessPieceAtPos(new ChessPosition(7, 4), new ChessPiece(ChessPieceType.Queen, allyColor, true)),
new ChessPieceAtPos(new ChessPosition(3, 4), new ChessPiece(ChessPieceType.King, allyColor, true)),
new ChessPieceAtPos(new ChessPosition(3, 0), new ChessPiece(ChessPieceType.Bishop, enemyColor, true)),
new ChessPieceAtPos(new ChessPosition(4, 7), new ChessPiece(ChessPieceType.Queen, enemyColor, true)),
new ChessPieceAtPos(new ChessPosition(4, 2), new ChessPiece(ChessPieceType.King, enemyColor, true)),
};
// evaluate queen draws
IChessBoard board = new ChessBoard(pieces);
var draws = ChessDrawGenerator.Instance.GetDraws(board, pieces[0].Position, null, true);
Assert.True(draws.Count() == ((row + col == 7) ? 7 : 5));
// check if the draws are correctly applied to the chess board
foreach (var draw in draws)
{
board = new ChessBoard(pieces);
board = board.ApplyDraw(draw);
var pieceCmp = new ChessPiece(ChessPieceType.Rook, allyColor, true);
Assert.True(!board.IsCapturedAt(draw.OldPosition) && board.GetPieceAt(draw.NewPosition) == pieceCmp);
}
}
}
}
public void GetCheckGameStatusTest()
{
// test no check
IChessBoard board = ChessBoard.StartFormation;
var enemyDraw = new ChessDraw(board, new ChessPosition(0, 0), new ChessPosition(0, 0));
board = board.ApplyDraw(enemyDraw);
Assert.True(ChessDrawSimulator.Instance.GetCheckGameStatus(board, enemyDraw) == ChessGameStatus.None);
// test simple check
var pieces = new List <ChessPieceAtPos>()
{
new ChessPieceAtPos(new ChessPosition(0, 4), new ChessPiece(ChessPieceType.King, ChessColor.White, true)),
new ChessPieceAtPos(new ChessPosition(1, 5), new ChessPiece(ChessPieceType.Peasant, ChessColor.White, true)),
new ChessPieceAtPos(new ChessPosition(7, 3), new ChessPiece(ChessPieceType.Queen, ChessColor.Black, true)),
new ChessPieceAtPos(new ChessPosition(7, 4), new ChessPiece(ChessPieceType.King, ChessColor.Black, true)),
};
board = new ChessBoard(pieces);
enemyDraw = new ChessDraw(board, new ChessPosition(7, 3), new ChessPosition(6, 4));
board = board.ApplyDraw(enemyDraw);
Assert.True(ChessDrawSimulator.Instance.GetCheckGameStatus(board, enemyDraw) == ChessGameStatus.Check);
// test checkmate
for (int putSavingPieceValue = 0; putSavingPieceValue < 2; putSavingPieceValue++)
{
pieces = new List <ChessPieceAtPos>()
{
new ChessPieceAtPos(new ChessPosition(0, 4), new ChessPiece(ChessPieceType.King, ChessColor.White, true)),
new ChessPieceAtPos(new ChessPosition(6, 1), new ChessPiece(ChessPieceType.Peasant, ChessColor.White, true)),
new ChessPieceAtPos(new ChessPosition(2, 3), new ChessPiece(ChessPieceType.Queen, ChessColor.Black, true)),
new ChessPieceAtPos(new ChessPosition(2, 4), new ChessPiece(ChessPieceType.King, ChessColor.Black, true)),
};
// allow the ally to avoid the checkmate by putting an additional chess piece on the board
// and test if the simulator makes use of this opportunity
bool putSavingPiece = (putSavingPieceValue == 1);
if (putSavingPiece)
{
pieces.Add(new ChessPieceAtPos(new ChessPosition(1, 7), new ChessPiece(ChessPieceType.Rook, ChessColor.White, true)));
}
board = new ChessBoard(pieces);
enemyDraw = new ChessDraw(board, new ChessPosition(2, 3), new ChessPosition(1, 4));
board = board.ApplyDraw(enemyDraw);
Assert.True(
(!putSavingPiece && ChessDrawSimulator.Instance.GetCheckGameStatus(board, enemyDraw) == ChessGameStatus.Checkmate) ||
(putSavingPiece && ChessDrawSimulator.Instance.GetCheckGameStatus(board, enemyDraw) == ChessGameStatus.Check)
);
}
// test stalemate
pieces = new List <ChessPieceAtPos>()
{
new ChessPieceAtPos(new ChessPosition(0, 4), new ChessPiece(ChessPieceType.King, ChessColor.White, true)),
new ChessPieceAtPos(new ChessPosition(6, 1), new ChessPiece(ChessPieceType.Peasant, ChessColor.White, true)),
new ChessPieceAtPos(new ChessPosition(2, 3), new ChessPiece(ChessPieceType.Queen, ChessColor.Black, true)),
new ChessPieceAtPos(new ChessPosition(3, 5), new ChessPiece(ChessPieceType.Queen, ChessColor.Black, true)),
new ChessPieceAtPos(new ChessPosition(2, 4), new ChessPiece(ChessPieceType.King, ChessColor.Black, true)),
new ChessPieceAtPos(new ChessPosition(7, 1), new ChessPiece(ChessPieceType.Rook, ChessColor.Black, true)),
};
board = new ChessBoard(pieces);
enemyDraw = new ChessDraw(board, new ChessPosition(3, 5), new ChessPosition(2, 5));
board = board.ApplyDraw(enemyDraw);
Assert.True(ChessDrawSimulator.Instance.GetCheckGameStatus(board, enemyDraw) == ChessGameStatus.Stalemate);
}
private void testRochadeKingDraws()
{
// go through each king x rook combo
for (int run = 0; run < 4; run++)
{
// get the (row, column) of the rook before rochade
int rookRow = run / 2 == 0 ? 0 : 7;
int rookCol = run % 2 == 0 ? 0 : 7;
// determine the old and new positions of king / rook after rochade
var oldKingPos = new ChessPosition(rookRow, 4);
var newKingPos = new ChessPosition(rookRow, (rookCol == 0 ? 2 : 6));
var oldRookPos = new ChessPosition(rookRow, rookCol);
var newRookPos = new ChessPosition(rookRow, (rookCol == 0 ? 3 : 5));
// determine the side performing a rochade
var allyColor = (rookRow == 0) ? ChessColor.White : ChessColor.Black;
var enemyColor = allyColor.Opponent();
// go through all 4 tuples bool x bool; only (false, false) should enable a rochade
for (int wasMovedValue = 0; wasMovedValue < 4; wasMovedValue++)
{
// determine whether king / rook was already moved before the rochade
bool wasKingMoved = wasMovedValue / 2 == 0;
bool wasRookMoved = wasMovedValue % 2 == 0;
// attach with a rook and go through every scenario threatening the king's rochade passage
for (int attack = 0; attack < 4; attack++)
{
var enemyPos = new ChessPosition(4, (rookCol == 0) ? (4 - attack) : (4 + attack));
var enemyKingPos = new ChessPosition(4, 0);
for (int block = 0; block < 2; block++)
{
bool isBlocked = block == 1;
var blockPos = new ChessPosition(rookRow, 1);
var pieces = new List <ChessPieceAtPos>()
{
new ChessPieceAtPos(oldKingPos, new ChessPiece(ChessPieceType.King, allyColor, wasKingMoved)),
new ChessPieceAtPos(oldRookPos, new ChessPiece(ChessPieceType.Rook, allyColor, wasRookMoved)),
new ChessPieceAtPos(enemyPos, new ChessPiece(ChessPieceType.Rook, enemyColor, true)),
new ChessPieceAtPos(enemyKingPos, new ChessPiece(ChessPieceType.King, enemyColor, true)),
};
if (isBlocked)
{
pieces.Add(new ChessPieceAtPos(blockPos, new ChessPiece(ChessPieceType.Knight, allyColor, false)));
}
// init chess board and rochade draw
IChessBoard board = new ChessBoard(pieces);
var draw = new ChessDraw(board, pieces[0].Position, newKingPos);
// check whether the draw validation returns the expected value
bool shouldRochadeBeValid = !wasKingMoved && !wasRookMoved && attack >= 3 && (!isBlocked || rookCol != 0);
bool isRochadeValid = draw.IsValid(board);
Assert.True(shouldRochadeBeValid == isRochadeValid);
// check whether the rochade is applied correctly to the chess board
if (isRochadeValid)
{
board = board.ApplyDraw(draw);
Assert.True(
!board.IsCapturedAt(oldKingPos) && board.GetPieceAt(newKingPos).Type == ChessPieceType.King && board.GetPieceAt(newKingPos).Color == allyColor &&
!board.IsCapturedAt(oldRookPos) && board.GetPieceAt(newRookPos).Type == ChessPieceType.Rook && board.GetPieceAt(newRookPos).Color == allyColor
);
}
}
}
}
}
}
private void testOneAndDoubleForeward()
{
// simulate for white and black side
for (int dfwColorValue = 0; dfwColorValue < 2; dfwColorValue++)
{
var allyColor = (ChessColor)dfwColorValue;
// get the column where the peasant is moving foreward
for (int col = 0; col < 8; col++)
{
int oldRow = (allyColor == ChessColor.White) ? 1 : 6;
int sfwNewRow = (allyColor == ChessColor.White) ? 2 : 5;
int dfwNewRow = (allyColor == ChessColor.White) ? 3 : 4;
var oldPos = new ChessPosition(oldRow, col);
var sfwNewPos = new ChessPosition(sfwNewRow, col);
var dfwNewPos = new ChessPosition(dfwNewRow, col);
// check if the draw is only valid if the peasant was not already moved
for (int wasMovedValue = 0; wasMovedValue < 2; wasMovedValue++)
{
var wasMoved = (wasMovedValue == 1);
// check if blocking pieces of both colors are taken in consideration
for (int blockingPieceRowDiff = 2; blockingPieceRowDiff < 4; blockingPieceRowDiff++)
{
int blockRow = (allyColor == ChessColor.White) ? (oldRow + blockingPieceRowDiff) : (oldRow - blockingPieceRowDiff);
var blockPos = new ChessPosition(blockRow, col);
for (int bpColorValue = 0; bpColorValue < 2; bpColorValue++)
{
var bpColor = (ChessColor)bpColorValue;
//output.WriteLine($"testing constellation: allyColor={ allyColor.ToString() }, sfwNewPos={ sfwNewPos }, dfwNewPos={ dfwNewPos }, blockPos={ blockPos }, wasMoved={ wasMoved }");
var pieces = new List <ChessPieceAtPos>()
{
new ChessPieceAtPos(oldPos, new ChessPiece(ChessPieceType.Peasant, allyColor, wasMoved)),
new ChessPieceAtPos(blockPos, new ChessPiece(ChessPieceType.Peasant, bpColor, wasMoved)),
new ChessPieceAtPos(new ChessPosition(0, 4), new ChessPiece(ChessPieceType.King, ChessColor.White, false)),
new ChessPieceAtPos(new ChessPosition(7, 4), new ChessPiece(ChessPieceType.King, ChessColor.Black, false)),
};
IChessBoard board = new ChessBoard(pieces);
var sfwDraw = new ChessDraw(board, oldPos, sfwNewPos);
bool shouldSfwBeValid = (blockingPieceRowDiff > 1);
bool isSfwValid = sfwDraw.IsValid(board);
Assert.True(shouldSfwBeValid == isSfwValid);
var dfwDraw = new ChessDraw(board, oldPos, dfwNewPos);
bool shouldDfwBeValid = (wasMoved == false) && (blockingPieceRowDiff > 2);
bool isDfwValid = dfwDraw.IsValid(board);
Assert.True(shouldDfwBeValid == isDfwValid);
if (isSfwValid)
{
var pieceCmp = new ChessPiece(ChessPieceType.Peasant, allyColor, true);
// check if the chess piece is moved correctly
board = new ChessBoard(pieces);
board = board.ApplyDraw(dfwDraw);
Assert.True(!board.IsCapturedAt(oldPos) && board.GetPieceAt(dfwNewPos) == pieceCmp);
}
if (isDfwValid)
{
var pieceCmp = new ChessPiece(ChessPieceType.Peasant, allyColor, !wasMoved);
// check if the chess piece is moved correctly
board = new ChessBoard(pieces);
board = board.ApplyDraw(dfwDraw);
Assert.True(!board.IsCapturedAt(oldPos) && board.GetPieceAt(dfwNewPos) == pieceCmp);
}
}
}
}
}
}
}