1. d4 d5 2. c4 dxc4 3. Qa4+ Nc6 4. Nf3 Nf6 5. e3 e6 6. Bxc4 Bd6 7. O-O O-O 8. Rd1

Black's upcoming ...e5 and the subsequent exchanges on that square will leave White with a kingside pawn majority. Hence this rook may belong at f1 to support the advance of White's e-pawn and f-pawn.

8...Qe7 9. Nc3

9...a6

Retains the dark square bishop, as 10. Nb5 loses material to 10...axb5 11. Qxa8 bxc4.

10. Qc2 e5 11. dxe5 Nxe5 12. Nxe5 Qxe5 13. f4 Qh5 14. Nd5

The positionally desirable 14. e4? loses to 14...Bc5+ 15. Kh1 Ng4, but an immediate 14. Be2 would have avoided weakening the e4-square.

14...Ne4!

Exploiting the underprotection of the d1-rook to stifle White's pawn majority.

15. Be2

Perhaps 15. Bd3 Nc5 (15...f5 16. Bxe4 fxe4 17. Nc3 Bf5 18. Rd4 wins a pawn, and Black's development doesn't seem worth it) 16. e4 was best, conceding the two bishops in order to liberate the e-pawn.

15...Bg4 16. Bxg4 Qxg4 17. Rd4

17. h3 Qh5 18. g4? fails to 18...Qxh3 19. Qxe4 Qxg4+ and the capture of White's rook.

17...f5 18. Nxc7 Rac8 19. Qb3+ Kh8 20. Ne6

20. Nd5 was better. The text leads to a debacle.

20...Qe2! 21. Qd1 Qf2+ 22. Kh1 Rc2 23. Qg1 Rf6! 24. Ng5 Ng3+! 25. hxg3 Rh6+ 26. Nh3

26...Rxh3+!

White will be mated after 27. gxh3 Qf3+.

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