That's the rules. You can't win if you don't have enough material to win by any sequence of moves. For more detail search insufficient material in the forum search bar and find the thousands of previous threads on this topic.
Why nul ?
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he lost on time but the rule is in these conditions is that the winner on time must have piece or pawns in a way that make a possible checkmate.
for example in this position if white had a light squared bishop he was winner.[just imagine this position :
Black=Ka8,Bb8(this bishop is e-pawn promoted to a bishop!),Qh6,Qh5,Rg5,Bd3 all other pawns at h7,g6,f5.
white=Kb6,Bc8. now white can simply checkmate by 1.Bb7#]
http://www.chess.com/livechess/game?id=470845163
Hi everybody,
My opponent losed on time but the game is considered PAT (insuficient material)....
Can anyone tell me why ?
Regards,