internal override MoveResult ValidateMove(
ChessBoard chessBoard,
BoardPosition from,
BoardPosition to,
out ExceptionReasonDetail exceptionReasonDetail)
{
exceptionReasonDetail = ExceptionReasonDetail.None;
MoveResult result = MoveResult.Illegal;
int fileDiff = Math.Abs(from.InternalFile - to.InternalFile);
int forward = (this.Colour == Colour.White) ? to.InternalRank - from.InternalRank : from.InternalRank - to.InternalRank;
Square toSquare = chessBoard.GetSquare(to);
if (forward == 1) {
if (fileDiff == 0) {
if (toSquare.ChessPiece != null) {
result = MoveResult.Collision;
}
else {
result = MoveResult.Valid;
}
}
if (fileDiff == 1) {
if (toSquare.ChessPiece != null && toSquare.ChessPiece.Colour != this.Colour) {
result = MoveResult.Valid;
}
else {
exceptionReasonDetail = ExceptionReasonDetail.PawnCannotMoveDiagonallyUnlessCapturing;
}
}
}
if (forward == 2 && fileDiff == 0) {
bool onHomeRank = (this.Colour == Colour.White && from.Rank == 2) || (this.Colour == Colour.Black && from.Rank == 7);
if (onHomeRank && chessBoard.Round == 1) {
int inbetweenFile = from.InternalFile;
int inbetweenRank = (this.Colour == Colour.White) ? from.InternalRank + 1 : from.InternalRank - 1;
Square inbetweenSquare = chessBoard.GetSquare(new BoardPosition(inbetweenFile, inbetweenRank));
if (inbetweenSquare.ChessPiece != null) {
result = MoveResult.Collision;
}
else {
if (toSquare.ChessPiece == null) {
result = MoveResult.Valid;
}
}
}
else {
exceptionReasonDetail = ExceptionReasonDetail.PawnCannotMoveTwoSpacesAtThisTime;
}
}
return result;
}
internal override MoveResult ValidateMove(
ChessBoard chessBoard,
BoardPosition from,
BoardPosition to,
out ExceptionReasonDetail exceptionReasonDetail)
{
exceptionReasonDetail = ExceptionReasonDetail.None;
MoveResult result = MoveResult.Illegal;
int fileDiff = Math.Abs(from.InternalFile - to.InternalFile);
int rankDiff = Math.Abs(from.InternalRank - to.InternalRank);
if ((fileDiff == 2 && rankDiff == 1) || (fileDiff == 1 && rankDiff == 2)) {
Square toSquare = chessBoard.GetSquare(to);
if (toSquare.ChessPiece == null || toSquare.ChessPiece.Colour != this.Colour) {
result = MoveResult.Valid;
}
}
return result;
}
public void MakeMove_GivenAValidMove_Succeeds()
{
var chessBoard = new ChessBoard();
var blackKnight = new Knight(Colour.Black);
var boardPosition1 = new BoardPosition("A1");
var boardPosition2 = new BoardPosition("B3");
chessBoard.SetInitialPosition(boardPosition1, blackKnight);
chessBoard.MakeMove(boardPosition1, boardPosition2);
Assert.That(chessBoard.GetSquare(boardPosition1), Is.Not.Null);
Assert.That(chessBoard.GetSquare(boardPosition1).ChessPiece, Is.Null);
Assert.That(chessBoard.GetSquare(boardPosition2), Is.Not.Null);
Assert.That(chessBoard.GetSquare(boardPosition2).ChessPiece, Is.Not.Null);
Assert.That(chessBoard.GetSquare(boardPosition2).ChessPiece, Is.InstanceOf<Knight>());
Assert.That(chessBoard.GetSquare(boardPosition2).ChessPiece.Colour, Is.EqualTo(Colour.Black));
}
public void SetInitialPosition_GivenKnightAtA1_Succeeds()
{
var chessBoard = new ChessBoard();
var boardPosition = new BoardPosition("A1");
chessBoard.SetInitialPosition(boardPosition, new Knight(Colour.Black));
Assert.That(chessBoard.GetSquare(boardPosition), Is.Not.Null);
Assert.That(chessBoard.GetSquare(boardPosition).ChessPiece, Is.Not.Null);
Assert.That(chessBoard.GetSquare(boardPosition).ChessPiece, Is.InstanceOf<Knight>());
Assert.That(chessBoard.GetSquare(boardPosition).ChessPiece.Colour, Is.EqualTo(Colour.Black));
}
