Going into the final round there was a six-way tie atop the U18: Alexander Costello (US), Eugene Hua (CAN), Weley Wang (US), Joshua Doknjas (CAN), Maili-Jade Ouellet (CAN) and Yuanchen Zhang (CAN), each with 6/8.
Maili-Jade was one of several girls who opted to play in the Open section, and started with 4/4 before losing to Costello. Another was Carissa Yip (US), who had 5.5/8 going into the last round.
[Event "NAYCC U18"]
[Site "Kingston"]
[Date "2019.08.20"]
[Round "9"]
[White "Zhang, Yuanchen"]
[Black "Doknjas, Joshua"]
[Result "0-1"]
[ECO "A01"]
[Annotator "John Upper"]
[PlyCount "90"]
[EventDate "2019.08.20"]
[EventCountry "CAN"]
1. b3 {Zhang has no games in CanBase with this as an opening move -- all his
recent games are either d4 or e4; however...} e5 2. Bb2 Nc6 3. c4 Nf6 4. e3 {
... he did used to play the Sicilian with ...e6, so this structure might be
comfortable for him.} d5 5. cxd5 Nxd5 6. a3 (6. Bb5 {is active, but not good
for White after after:} Ndb4 $1 7. Nf3 (7. Bxe5 $2 Qd5 $19) 7... Nd3+ (7... e4
$1 $15) 8. Bxd3 Qxd3 9. Bxe5 Bg4 10. Bc3 O-O-O {with development for the pawn.}
) 6... Bd6 7. Qc2 O-O 8. Nf3 Qe7 {[#]} 9. d3 {White transposes to a Kan/
Paulsen Sicilian (reversed) but with slower play due to b2-b3 rather than
b2-b4.} (9. Bd3 $5 Kh8 10. Be4 Nb6 11. Bxc6 bxc6 {White has better structure,
Black has the B-pair. White plays to stabilize the light-squares before trying
anything more active.} 12. d3 (12. Qxc6 $2 e4 (12... Ba6 $15) 13. Nd4 f5 14.
O-O Bxh2+ $3 $19) 12... Bd7 13. Nbd2 f5 14. e4 fxe4 15. dxe4 Rf4 16. Qc3 Re8
17. O-O c5 18. Kh1 Bc6 19. Rae1 Nd7 20. Ng1 Nf6 $6 21. f3 Nh5 $4 22. g4 $1 $18
{After ...Nf6 the Rf4 is trapped and White wins the exchange, so 1-0 Petrosian,
T (2620)-Balashov,Y (2590) Soviet Union, 1978.}) 9... f5 {In Megabase, White
scores 32% and -60 Elo from here.} 10. Nbd2 a5 $1 {I like this move, which is
the way Karpov used to play against the Schevenningen in the 1980s.} (10... Bd7
11. g3 $5 {is what Lakdawala mentions in his Everyman book on 1.b3, when ...f4
gxf4 might give White play down the g-file.}) 11. Be2 Bd7 12. O-O Kh8 13. Rfd1
{[#]} Nb6 (13... f4 14. e4 Nf6 15. h3 $1 {with a kind of reversed-Najdorf
structure.} Be8 16. Rdc1 Bh5 17. Nc4 Nd7 18. Rab1 Bxf3 19. Bxf3 Bc5 20. Nxa5
Nxa5 21. b4 Bd6 22. bxa5 Rxa5 23. d4 exd4 24. Bxd4 b6 25. a4 Ne5 26. Rb5 Rfa8
27. Bxe5 Bxe5 28. Qc6 Rxa4 29. Rxb6 cxb6 30. Qxa4 Rd8 31. Rd1 Rxd1+ {1/2-1/2
(31) Bauer,C (2631)-Kravtsiv,M (2636) Cappelle-la-Grande 2016}) 14. Bf1 Rae8
15. g3 Be6 (15... e4 16. Nh4 $14 (16. Nd4 $14)) 16. Bg2 Bd5 17. Nc4 Qf7 18.
Rac1 h6 19. Qc3 Re7 20. Ne1 $2 Bxg2 21. Nxg2 Nd7 (21... f4 $5 22. Nxd6 $2 cxd6
23. exf4 Nd4 $19) 22. Nxd6 (22. d4 $5 f4 (22... e4 $6 23. Nf4 $14 Bxf4 $2 (
23... g5 $4 24. Ne6 $1 $18) 24. exf4 $16) 23. exf4 Nxd4 24. Nxd6 cxd6 (24...
Ne2+ $5 25. Kf1 {Only move.} Qh5 {Only move.} 26. Qxc7 $13) 25. Qe3 (25. Rxd4 $2 exd4 26. Qxd4 Qxb3
$15) 25... Nxb3 (25... Qxb3 $4 26. Bxd4 $18) 26. Rc7 $11) 22... cxd6 23. b4
axb4 24. axb4 Nf6 25. b5 Nd8 26. Ba3 Rd7 27. Rd2 Ne6 $17 {Black's Ns are
beautifully centralized, White's Kingside is fragile, and Black has more than
one pawn break to play for.} 28. Qb3 Re8 29. Rdc2 d5 30. Nh4 f4 $1 31. Rc8 Rxc8
(31... fxg3 32. Rxe8+ Qxe8) 32. Rxc8+ Kh7 33. exf4 exf4 {[#] During the game I
thought this position was probably lost for White -- too many weaknesses
around his K -- but SF10 says it's 0.00.} 34. b6 $6 (34. d4 {gives up e4, and
looks terrible, but leads to one particularly sharp 0.00 computer line:} Ne4
35. f3 {Only move.} fxg3 36. hxg3 Nxg3 37. Qc2+ g6 {Only move.} 38. Nxg6 {Only move.} Ne2+ (38... Qxg6 $4 39.
Rh8+ $18) (38... Qf5 39. Nf8+ $1 Nxf8 40. Bxf8 $11) 39. Kh2 (39. Kf2 Qxf3+ {Only move.}
40. Ke1 $1 $11) 39... Kg7 {Only move.} 40. Qxe2 Qxg6 $11 {SF10}) 34... Ng5 35. Qa4 $2 (
35. d4) 35... d4 (35... Qe6 $1 $19 {threatening ...f3.} 36. Qd1 Ng4 37. gxf4
Nh3+ $19) 36. Qa8 $1 {[#]Threatening mate (of course), but also creating a
wildly imbalanced position, where White's majors are as far as they can be
from defending his K.} Ng8 {Defends against Rh8#.} (36... Nh3+ {also stops
mate by counter-attacking to open a square for the black K:} 37. Kg2 g5 38.
Rh8+ Kg7 39. Nf5+ Kg6 {with a wild position which would test both players; e.g.
} 40. Qa5 $11 (40. Kxh3 $11) 40... Rd5 41. g4 $1 Nxg4 {Only move.} 42. Ne7+ {Only move.} Qxe7 {Only move.}
43. Qxd5 {Only move.} Qxa3 {Only move.} $11 44. Kxh3 Qxd3+ 45. Kxg4 Qd1+ 46. Kh3 Qf1+ 47. Kg4 $11)
37. Qa5 (37. Rf8 $1 Qa2 38. Bc5 $4 {illustrates Black's threats:} (38. Qe8 $1)
38... Nh3+ $1 39. Kg2 Qxf2+ 40. Kxh3 Qf1+ 41. Kg4 (41. Ng2 f3 $19) 41... h5+
42. Kxh5 (42. Kg5 Rd5+ 43. Nf5 Qh3 {#1}) 42... Nf6+ 43. Rxf6 gxf6 $19) 37...
Rd5 $1 38. Qe1 Rb5 39. Rc7 Qd5 $19 40. Qe8 Rxb6 $1 {guards against Qg6+
followed by mate on g7.} 41. Qc8 Re6 42. f3 Qa5 {Hits the Ba3 and threatens
mate after ...Qe1+. White has nothing but tries for a blunder...} 43. Rxg7+ Kxg7 44. Qd7+ Ne7 45. Qxd4+ Kg8 {Final Standings in the U18 were determined by Tie-Break: 1st (and IM title) FM Alex Costello, 2nd (and FM title and IM Norm) Joshua Doknjas, 3rd (IM Norm) FM Wesley Wang.} 0-1