Fix king moves and fix formatting.

chess/board.go

@@ -200,12 +200,11 @@ func (b *Board) handleSpecialMove(move types.Move) bool {
 	var was bool
 	var pieceAtStartSquare = b.getPieceAt(move.StartSquare)
 
-	switch pieceAtStartSquare.(type) {
+	switch piece := pieceAtStartSquare.(type) {
 	case Pawn:
-		pawn := pieceAtStartSquare.(Pawn)
-		was = pawn.HandlePossiblePromotion(b, move)
+		was = piece.HandlePossiblePromotion(b, move)
 		if !was {
-			was = pawn.HandleEnPassant(b, move, b.getLastMove())
+			was = piece.HandleEnPassant(b, move, b.getLastMove())
 		}
 	}
 	return was

chess/free_squares.go

@@ -31,14 +31,15 @@ func (b *Board) GetNonBlockedDiagonals(fromSquare types.Coordinate) []types.Coor
 }
 
 func (b *Board) GetNonBlockedKingMoves(fromSquare types.Coordinate) []types.Coordinate {
-    return b.getNonBlockedConsecutive(fromSquare.GetAllKingMoves(), fromSquare)
+	return b.getNonBlockedRaw(fromSquare.GetAllKingMoves(), fromSquare)
 }
 
 func (b *Board) GetNonBlockedKnightMoves(fromSquare types.Coordinate) []types.Coordinate {
-	allKnightMoves := fromSquare.GetAllKnightMoves()
-	return b.getNonBlockedForKnights(allKnightMoves, fromSquare)
+	return b.getNonBlockedRaw(fromSquare.GetAllKnightMoves(), fromSquare)
 }
 
+// returns only those squares in a straight/diagonal that are not blocked
+// until it hits a blocking piece (excluding same color, including diff color)
 func (b *Board) getNonBlockedConsecutive(
 	squaresToCheck []types.Coordinate,
 	sourceSquare types.Coordinate,
@@ -64,7 +65,8 @@ func (b *Board) getNonBlockedConsecutive(
 	return nonBlocked
 }
 
-func (b *Board) getNonBlockedForKnights(
+// returns any square in squaresToCheck that are not blocked
+func (b *Board) getNonBlockedRaw(
 	squaresToCheck []types.Coordinate,
 	sourceSquare types.Coordinate,
 ) []types.Coordinate {