[White "Illiso"]
[Black "jdutton"]
1. d4 Nf6 2. f3 d5 3. Bf4 e6 4. Qd3 c5 5. dxc5 Bxc5 6. Bxb8 Rxb8 7. Qb5+
Nd7 8. Nh3 a6 9. Qd3 Qf6 10. c3 Ne5 11. Qc2 Nc4 12. e4 Ne3 {a strong outpost with a constant threat of a fork with Nc2+, white's queen is the only defender, black will look to harrass the queen.} 13. Qd3 dxe4 {opening up attacking lines by clearing out the center} 14.
Qxe4 {fxe4 was better, white queen is more easily attacked after Qxe4} e5 {setting up for Bf5 to force Nc2+} 15. b4?! {cut off a4 for queen, allowing Bf5 to force white to exchange queen for a minor piece. For sure the best move here is Qxe3, losing queen for knight but preventing the devastating follow up attack of Nc2+} Bf5 16. Qxb7?! Nc2+ 17. Kd1 Rxb7 18. Bxa6 {a feeble attack that could easily be taken with Qxa6, but black has a better move if he stays focused on the goal at hand} Qd6+ {White king should flee} 19. Nd2 Rd7 {the only logical move, mate in four.} 20.
Rc1 {saving his rook is the top priority? mate in one} Qxd2#