1A. It's a mistake because white has a reserve tempo move with g2-g3. 1. Kc2 Kc6 2. Kb3 Kc5 3. g3! and black has to give up his pawn.2. Miguel Garcia played 20. f4 here against Andrew Berger. How should black reply?
3. Black actually played 20... Nd7. Find the best continuation for white.
2A. Both 20... h6 and 20.... Nc4 (21. bxc4? Rb2!) are better than what was played
3A. After 21. e5! de 22. fe Qxe5 23. Rae1 Qd6 (D), they reached the position below.
4. How does white force matters?
4A. 24. Ne6! fe 25. Rxe6 Qc7 26. Rxe7 Kg8 27. Qh6 (D) 1-0
5. In the above position, black blundered with 17... Qe7. How does white (Alexis Paredes) take advantage of his development lead?
5A. White played 18. Qxe7 Nxe7 19. Re1 Nc6 20. Re8+ Kh7 21. Bg8+ Kg6 to reach the position below.
6A. 22. Nh4+ Kh5 23. Bf7+ Kg5 24. Ne4+ Kxh4 25. g3+ Kxh3 26. Be6# (D)