Earlier quoted context omitted.
if anyone doesn't capture anything or move a pawn in 50 moves its an draw (better train on that bishop & knight endgame :)... if anyone claims it, so uh, not sure how that counts :) However if an checkmate is impossible with the remaining pieces it's automatic edit: missing pawn from sentence
> if anyone doesn't capture or move anything in 50 moves its an draw You didn't quite state that right--every move something moves, so it is not possible to go 50 moves without moving anything. :-) The rule is 50 moves without a pawn moving or anything being captured. Also, it can be a draw, but it does not have to be. When the last 50 moves have been without a pawn move or a capture, the player on the move can claim…
In fact, the only irreversible move that doesn't reset the 50 move rule is castling (or losing the right to castle), as having the ability to castle technically changes the position.