public void PawnNotPassedIfOpponentInSameOrAdjacentFile()
{
var pawnEvaluator = new PawnEvaluator();
var whitePawnC7OpponentSameFileBoard = CreateBoardWithWhitePawnAt(new Position(File.C, Rank._7));
whitePawnC7OpponentSameFileBoard.AddPiece(new PieceBuilder(PieceType.Pawn)
.As(PieceColor.Black)
.At(new Position(File.C, Rank._8))
.Create());
var whitePawnC71 = whitePawnC7OpponentSameFileBoard.WhitePieces[0];
Assert.False(pawnEvaluator.IsPawnPassed(whitePawnC71,
whitePawnC7OpponentSameFileBoard.WhitePieces, whitePawnC7OpponentSameFileBoard.BlackPieces));
var whitePawnC7OpponentAdjacentFileBoard = CreateBoardWithWhitePawnAt(new Position(File.C, Rank._7));
whitePawnC7OpponentAdjacentFileBoard.AddPiece(new PieceBuilder(PieceType.Pawn)
.As(PieceColor.Black)
.At(new Position(File.B, Rank._8))
.Create());
var whitePawnC72 = whitePawnC7OpponentAdjacentFileBoard.WhitePieces[0];
Assert.False(pawnEvaluator.IsPawnPassed(whitePawnC72,
whitePawnC7OpponentAdjacentFileBoard.WhitePieces, whitePawnC7OpponentAdjacentFileBoard.BlackPieces));
}
public void DoubledPawnsDetected()
{
var pawnEvaluator = new PawnEvaluator();
var doubledBoard = CreateBoardWithWhitePawnAt(new Position(File.D, Rank._4));
doubledBoard.AddPiece(new PieceBuilder(PieceType.Pawn)
.As(PieceColor.White)
.At(new Position(File.D, Rank._3))
.Create());
var doubledPawn = doubledBoard.WhitePieces[0];
Assert.True(pawnEvaluator.IsPawnDoubled(doubledPawn,
doubledBoard.WhitePieces, doubledBoard.BlackPieces));
var notDoubledBoard = CreateBoardWithWhitePawnAt(new Position(File.D, Rank._4));
notDoubledBoard.AddPiece(new PieceBuilder(PieceType.Pawn)
.As(PieceColor.White)
.At(new Position(File.C, Rank._3))
.Create());
var notDoubledPawn = notDoubledBoard.WhitePieces[0];
Assert.False(pawnEvaluator.IsPawnDoubled(notDoubledPawn,
notDoubledBoard.WhitePieces, notDoubledBoard.BlackPieces));
}
public void PawnNotPassedIfNotPastMiddleBoard()
{
var pawnEvaluator = new PawnEvaluator();
var whitePawnC3Board = CreateBoardWithWhitePawnAt(new Position(File.C, Rank._3));
var whitePawnC3 = whitePawnC3Board.WhitePieces[0];
Assert.False(pawnEvaluator.IsPawnPassed(whitePawnC3,
whitePawnC3Board.WhitePieces, whitePawnC3Board.BlackPieces));
}
public void DetectsPassedPawns()
{
var pawnEvaluator = new PawnEvaluator();
var whitePawnC7Board = CreateBoardWithWhitePawnAt(new Position(File.C, Rank._7));
var whitePawnC7 = whitePawnC7Board.WhitePieces[0];
Assert.True(pawnEvaluator.IsPawnPassed(whitePawnC7,
whitePawnC7Board.WhitePieces, whitePawnC7Board.BlackPieces));
}
public void PawnRankCountCalculatedCorrectly()
{
var pawnEvaluator = new PawnEvaluator();
var wPawnC2Board = CreateBoardWithWhitePawnAt(new Position(File.C, Rank._2));
var wPawnC2 = wPawnC2Board.WhitePieces[0];
Assert.Equal(pawnEvaluator.GetPawnRankCount(wPawnC2), 1);
var bPawnC2Board = CreateBoardWithBlackPawnAt(new Position(File.C, Rank._2));
var bPawnC2 = bPawnC2Board.BlackPieces[0];
Assert.Equal(pawnEvaluator.GetPawnRankCount(bPawnC2), 6);
var wPawnC7Board = CreateBoardWithWhitePawnAt(new Position(File.C, Rank._7));
var wPawnC7 = wPawnC7Board.WhitePieces[0];
Assert.Equal(pawnEvaluator.GetPawnRankCount(wPawnC7), 6);
var bPawnC7Board = CreateBoardWithBlackPawnAt(new Position(File.C, Rank._7));
var bPawnC7 = bPawnC7Board.BlackPieces[0];
Assert.Equal(pawnEvaluator.GetPawnRankCount(bPawnC7), 1);
}
public void PawnFileCountCalculatedCorrectly()
{
var pawnEvaluator = new PawnEvaluator();
var pawnA2Board = CreateBoardWithWhitePawnAt(new Position(File.A, Rank._2));
var pawnA2 = pawnA2Board.WhitePieces[0];
Assert.Equal(pawnEvaluator.GetPawnFileCount(pawnA2), 1);
var pawnB2Board = CreateBoardWithWhitePawnAt(new Position(File.B, Rank._2));
var pawnB2 = pawnB2Board.WhitePieces[0];
Assert.Equal(pawnEvaluator.GetPawnFileCount(pawnB2), 2);
var pawnE2Board = CreateBoardWithWhitePawnAt(new Position(File.E, Rank._2));
var pawnE2 = pawnE2Board.WhitePieces[0];
Assert.Equal(pawnEvaluator.GetPawnFileCount(pawnE2), 4);
var pawnH4Board = CreateBoardWithWhitePawnAt(new Position(File.H, Rank._4));
var pawnH4 = pawnH4Board.WhitePieces[0];
Assert.Equal(pawnEvaluator.GetPawnFileCount(pawnH4), 1);
}
public void PawnProtectionIndexCalculatedCorrectly()
{
var pawnEvaluator = new PawnEvaluator();
// A single pawn by itself has a protection index of 0.0
var lonePawnBoard = CreateBoardWithWhitePawnAt(new Position(File.C, Rank._4));
var lonePawn = lonePawnBoard.WhitePieces[0];
Assert.Equal(pawnEvaluator.GetPawnProtectionIndex(lonePawn,
lonePawnBoard.WhitePieces, lonePawnBoard.BlackPieces), 0.0);
// A pawn with a friend that protects it (lower-left corner) has
// a protection index of 1.0
var pawnOneFriendBoard = CreateBoardWithWhitePawnAt(new Position(File.C, Rank._4));
pawnOneFriendBoard.AddPiece(new PieceBuilder(PieceType.Pawn)
.As(PieceColor.White)
.At(new Position(File.B, Rank._3))
.Create());
var pawnWithOneFriend = (from p in pawnOneFriendBoard.WhitePieces
where p.Position.Equals(new Position(File.C, Rank._4))
select p).First();
Assert.Equal(pawnEvaluator.GetPawnProtectionIndex(pawnWithOneFriend,
pawnOneFriendBoard.WhitePieces, pawnOneFriendBoard.BlackPieces), 1.0);
// A pawn with a friend that isn't at the corner is still at 0.0 :'(
var pawnOneDistantFriendBoard = CreateBoardWithWhitePawnAt(new Position(File.C, Rank._4));
pawnOneDistantFriendBoard.AddPiece(new PieceBuilder(PieceType.Pawn)
.As(PieceColor.White)
.At(new Position(File.A, Rank._3))
.Create());
var pawnWithOneDistantFriend = (from p in pawnOneDistantFriendBoard.WhitePieces
where p.Position.Equals(new Position(File.C, Rank._4))
select p).First();
Assert.Equal(pawnEvaluator.GetPawnProtectionIndex(pawnWithOneDistantFriend,
pawnOneDistantFriendBoard.WhitePieces, pawnOneDistantFriendBoard.BlackPieces), 0.0);
var pawnUnderAttackOnceBoard = CreateBoardWithWhitePawnAt(new Position(File.A, Rank._4));
pawnUnderAttackOnceBoard.AddPiece(new PieceBuilder(PieceType.Pawn)
.As(PieceColor.Black)
.At(new Position(File.B, Rank._5))
.Create());
var pawnUnderAttackOnce = (from p in pawnUnderAttackOnceBoard.WhitePieces
where p.Position.Equals(new Position(File.A, Rank._4))
select p).First();
Assert.Equal(pawnEvaluator.GetPawnProtectionIndex(pawnUnderAttackOnce,
pawnUnderAttackOnceBoard.WhitePieces, pawnUnderAttackOnceBoard.BlackPieces), -1.0);
var pawnUnderAttackTwiceBoard = CreateBoardWithWhitePawnAt(new Position(File.C, Rank._4));
pawnUnderAttackTwiceBoard.AddPiece(new PieceBuilder(PieceType.Pawn)
.As(PieceColor.Black)
.At(new Position(File.D, Rank._5))
.Create());
pawnUnderAttackTwiceBoard.AddPiece(new PieceBuilder(PieceType.Pawn)
.As(PieceColor.Black)
.At(new Position(File.B, Rank._5))
.Create());
var pawnUnderAttackTwice = (from p in pawnUnderAttackTwiceBoard.WhitePieces
where p.Position.Equals(new Position(File.C, Rank._4))
select p).First();
Assert.Equal(pawnEvaluator.GetPawnProtectionIndex(pawnUnderAttackTwice,
pawnUnderAttackTwiceBoard.WhitePieces, pawnUnderAttackTwiceBoard.BlackPieces), -2.0);
}
