It's a draw unless one side makes a mistake. In this case, Black obviously made a huge mistake by allowing mate in 1 on his 41st move.
Notice the only possibilities for draw from insufficient material are king vs king, king+bishop vs king, and king+knight vs king. In these circumstances, no matter how badly the lone king moves, it can never run into checkmate. In any other circumstance (king+knight vs king+pawn, king+bishop vs king+bishop, king+2 knights vs king, etc.) there are possible checkmates if one side blunders, as you pointed out.
Even though draw from insufficient material won't be claimed automatically, you could probably offer a draw and any reasonable opponent would accept it.
Notice the only possibilities for draw from insufficient material are king vs king, king+bishop vs king, and king+knight vs king. In these circumstances, no matter how badly the lone king moves, it can never run into checkmate. In any other circumstance (king+knight vs king+pawn, king+bishop vs king+bishop, king+2 knights vs king, etc.) there are possible checkmates if one side blunders, as you pointed out.
Even though draw from insufficient material won't be claimed automatically, you could probably offer a draw and any reasonable opponent would accept it.
whatever, nice mate. I hope you was white ^^
On the other hand:
http://en.lichess.org/analysis/8/2k5/4p3/4p1b1/3pB3/3Kp3/8/8_w_-_-
http://en.lichess.org/analysis/8/2k5/4p3/4p1b1/3pB3/3Kp3/8/8_w_-_-
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