```CBlair1986,

> I'd like to be able to check for a X-in-a-row win on a
> Y-by-Y board.  I'd eventually like to be able to check
> for a 10-in-a-row on a 50-by-50 board.  Are there any
> easy methods I could use, besides doing a check for
> each possible win?

Well, if you only need to check for a win after someone moves, you
can just perform four checks for the up/down/diagonal1/diagonal2 cases
for up to X squares away from the last move.

If instead you don't know the last move and need a generic algorithm
to see if player A has a win, a simple one is to initialize a YxY array
to zeros, then loop over each row/column.  For each square where player
A has played, increment the four squares: same row next column; next row
previous column; next row same column; and next row next column.  Or,
put another way:

123
456
789

If player A has played in square 5, increment squares 6, 7, 8, and
9.  After each increment, test for a value equal to X, indicating a
player A win.  If you need to check for a player B win, you'll need to
use the same algorithm on a separate array.  If you have a player C,
you'll need a third array, etc.

This algorithm is O(Y^2), so it won't scale well when Y becomes
large, but for a 50x50 board, your only talking about 2,500 iterations,
which should be fine.

I hope this helps.

- Warren Brown

```