public override void Execute(int row, int col, int value, Board board)
{
// Ignore rule if not on diagonal
if (row != col && row != 8 - col)
{
return;
}
// Top-left to bottom-right
for (var i = 0; i < 9; i++)
{
if (i == row)
{
continue;
}
board.MarkInvalid(i, i, value);
}
// Top-right to bottom-left
for (var i = 0; i < 9; i++)
{
if (i == row)
{
continue;
}
board.MarkInvalid(i, 8 - i, value);
}
}
public override void Execute(int row, int col, int value, Board board)
{
for (var c = 0; c < 9; c++)
{
if (c == col)
{
continue;
}
board.MarkInvalid(row, c, value);
}
}
public override void Execute(int row, int col, int value, Board board)
{
for (var r = 0; r < 9; r++)
{
if (r == row)
{
continue;
}
board.MarkInvalid(r, col, value);
}
}
public override void Execute(int row, int col, int value, Board board)
{
// Determine top-left coords of box
var startRow = (row / 3) * 3;
var startCol = (col / 3) * 3;
for (var rowOff = 0; rowOff < 3; rowOff++)
{
for (var colOff = 0; colOff < 3; colOff++)
{
var r = startRow + rowOff;
var c = startCol + colOff;
if (r == row && c == col)
{
continue;
}
board.MarkInvalid(r, c, value);
}
}
}