Swimming with Piranhas

This morning, I was very surprised and at the same time very happy to hear again from our regular reader IM Alex Wohl. He sent me a rather entertaining note where he talks about his plight in the 3rd President's Cup, in Baku. Instead of blockquoting, like I usually do, I quote Alex's email here for better reading.

IM Alex Wohl:

I am still on the same score as Loek Van Wely although here this is nothing to be proud of. One has to win the first few rounds otherwise you can be caught in a swamp filled with Piranhas who have tasted the blood of a foreign master. If Azerbaijanis have a chess style it is to attack at all costs. Positional considerations and material are hardly given a second thought as they haphazardly direct their pieces at your King.

Yesterday I played Elshad Orujov, a very pleasant man off the board but playing him requires good nerves. I withstood his kitchen sink attack and drew an ending several pawns up due to miserable technique. Today he played on the board next to me against a talented young Georgian IM who was not quite so careful. I will not annotate the game and if you play through it you will see why. Very entertaining though.

3rd President's Cup
Blegadze, Levon
Elshad, Orujov
A34

Comments to this game are by TCG. 1. Nf3 Nf6 2. c4 c5 3. g3 e6 4. Bg2 d5 5. O-O Nc6 6. cxd5 Nxd5 7. Nc3 Be7 8. a3 h5 9. h4 g5 10. hxg5 h4 11. gxh4 Nf4 12. Qa4 e5

After 12...e5

13. d3 Ng6 14. Be3 Bd7 15. Qe4 Nd4 16. Nxe5 Rxh4 Up to this moment, the chess programs judge the position to be a +- for white with 17. f4 now the recommended follow-up 17. Qxb7? But thanks to this materialistic route, white brings his advantage to a halt. 17...Nxe5 18. Qxa8 Qxa8 19. Bxa8 Rg4+

Position after 19...Rg4+

20. Bg2?? The most seemingly natural move but is, in fact, a catastrophic blunder. Now checkmate is nearly inevitable. Can you spot the mate? Blegadze had to resign in 4 moves. What were black's remaining moves?