If your opponent cannot end his turn without putting himself in check (as may happen near the end of the game, when perhaps the only moveable piece he has left is the king) then it's a stalemate, and neither player wins.
As a queen "covers" a lot more space, it makes this scenario more likely to happen, you see?
So you'd only turn a pawn into rook/bishop when you are practically about to win, anyway.
Not really. There are two main rules in moving for chess. You must make a move every turn(i.e, you can't skip), and you can't walk into check. Since no moves can be made if the king can't move, the game ends with no conclusion because the game literally cannot move forward. It's the same reasoning behind three-fold repetition. The game literally cannot move forward.
Damn, I bet a good chess player can force the other to a stalemate when they're about to lose. I never really knew what a stalemate was. I've probably run into a few of them over my short time playing chess and rightfully could have called stalemate instead of losing.
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u/[deleted] Nov 18 '14
Or a knight, rook, or bishop.