No Chess Grandmaster is normal; they only differ in the extent of their madness.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "White player"]
[Black "Black player"]
[Result "*"]
[BlackElo "0"]
[FEN "K7/8/8/8/4k3/1B6/8/2B5 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ Checkmate with the Bishop Pair|Step 1: Create a diagonal fence that the king
cannot cross. } 1. Bb2 Kf3 2. Bc2 Kf4 { Step 2: Bring the king into the fight.
There is no forced checkmate without all three pieces working together. } 3. Kb7 Ke3 4. Kc6 Kd2 { Avoid blunders. } 5. Bb1 Ke3 6. Kd5 Kf4 { Step 3: Drive the
king into the corner. } 7. Bc1+ Kf3 8. Bc2 Kf2 9. Ke4 Kg2 10. Kf4 Kf2 11. Be3+ Ke2 12. Ke4 Ke1 13. Kf3 Kf1 14. Bd2 Kg1 15. Kg3 Kf1 16. Bd3+ Kg1 17. Be3+ Kh1 { Step 4: Deliver checkmate. } 18. Be4# *