A good sacrifice is one that is not necessarily sound but leaves your opponent dazed and confused.
If your opponent offers you a draw, try to work out why he thinks he's worse off
Unlike my esteemed colleague Garry Kasparov, I don't restrict the strength of opposition to Elo <2000, as fly-swatting makes poor spectator sport. (on simultaneous exhibitions)
Surely, serious problems can't be solved just by talking about them.
Chess is ruthless: you've got to be prepared to kill people.
If chess is a vast jungle, computers are the chainsaws in a giant environmentally insensitive logging company.