Some time ago we played a game of chess with my friend and after 66. move reached the following position:
6k1/5b2/8/4q3/1K6/8/1RR5/8 w - - 0 1
We agreed that it's a draw.
No it isn't! It's white's move and the material looks balanced, but black will have his win after 53 moves (if white has an ideal defence).
This is what the almighty Nalimov says.
Don't bother to check this out with your multiprocessor chess software...it'll probably take months before it finds the right combination.
What to speak of the poor human brain.
Feeling humble now....