White(me) g3 h3 Rb4 Rd4 Qb8 Kg4 Black g5 h6 Qa5 Kf6 Last move was B8(Q) I resigned immediately 
A lesson for us all 
Here’s the position:
.
That’s not even close to the most embarrassing defeat ever. As a Class A player I once lost a game in three moves as White. Now that’s hard to do, but I was up to the task! It went:
- d4 Nf6
- Bg5 c6
- e3 Qa5+
…and with no way to avoid losing the bishop I decided to call it a day…
This humbling game is not necessarily my most embarrassing loss, but it was humbling and I learned enough that 6 months later I made master…
I often use this game to show students that we can all make gross mistakes and use them to learn and grow, rather than letting the error defeat us.
[Event “Master Challenge IV”]
[Site “?”]
[Date “1982.06.26”]
[Round “3.10”]
[White “Bachler, Kevin”]
[Black “Tomas, Jon”]
[Result “0-1”]
[ECO “B06”]
[WhiteElo “2110”]
[BlackElo “2247”]
[Annotator “Bachler,Kevin”]
[PlyCount “80”]
- e4 g6 2. d4 Bg7 3. Nc3 d6 4. Bc4 e6 5. Nf3 Ne7 6. Be3 d5 7. Bb3 O-O 8. Qe2 b6 9. O-O-O Ba6 10. Qd2 dxe4 11. Nxe4 Bb7 12. Ng3 a5 13. a4 Na6 14. h4 h5 15. Bh6 c5 16. Bxg7 Kxg7 17. Qg5 Bxf3 18. gxf3 Nf5 19. Nxh5+ Kh7 20. Nf6+ Kg7 21. h5 Rh8 22. h6+ Nxh6 23. Nh5+
Here Tomas offered a draw, but I decided to play for more. One of the lessons I learned from this game was to always play the board, take my time and not play too hard.)
23…Kh7 24. Qe5 gxh5 25. Rdg1??
(25. Rxh5! Qf8 26. Rdh1 Rg8 27. Qe4+ Rg6 (27… f5 28. Qb7+ Kg6 29. Bxe6 Qg7 30. Qd5±) 28. Rxh6+ Qxh6+ 29. Rxh6+ Kxh6 30. Qxa8±) 25… Rg8 26. Bc4 Qxd4 27. Bd3+ Rg6?? (27… f5 28. Qxe6 Qf4+ 29. Kb1 Nc7=) 28. Qxh5 Qf4+ 29. Kb1 Rag8 30. Rg4 Qxf3??? (30… Qd2 31. Rhg1 c4 32. Bxg6+ fxg6 33. Rxg6 Nb4 34. Rxh6+ ±)
It important to tell the entire story after 30…Qxf3??.
I had seen that this sort of mate could occur, but this position came up differently that I expected. So I went into a deep think, missing the obvious mate in 1 with 31 Qxh6#. FM Al Chow walked up while I was thinking, looked at the board, looked at me with a quizzical look on his face, and eventually walked away. After thinking awhile, I blundered with:
- Rhg1 Qxd3 32. cxd3 Rxg4 33. Rh1 Rg1+ 34. Kc2 Nb4+
At approximately this point, FM Chow walked back up, and started moving the pieces on the chessboard, giving commentary as he moved them. He was so certain I had played the mate, that he thought we were analyzing in the tournament room, not still playing. When we both protested saying “Al, what are you doing??”, he apologized and quickly stepped away.
That’s how bad it was. A master walking up could instantly see the mate in one, but after several minutes, I was still blind to it.
- Kd2 Rxh1 36. Qxh1 Rg6 37. f4 Kg7 38. Qe4 Nd5 39. Qe5+ Rf6 40. Qe1 Rxf4 0-1