From move 15 [the diagram doesn't appear due to some recent updates to drupal on this site], find the most Tal-like moves for White... and then do the calculations necessary to see which (if any) of those moves works.
74 players competed. GM Bator Sambuev won the top section with a perfect 5/5. FM Olivier Kenta Chiku-Ratte was clear 2nd with 4/5 and Svitlana Demchenko and Kevin Zhong were =3rd with 3.5/5.
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[Event "Eastern Ontario Open"]
[Site "Ottawa "]
[Date "2019.06.16"]
[Round "5"]
[White "Sambuev, Bator"]
[Black "Zhong, Kevin"]
[Result "1-0"]
[ECO "D05"]
[WhiteElo "2566"]
[BlackElo "2220"]
[Annotator "John Upper"]
[PlyCount "47"]
[EventDate "2019.??.??"]
1. d4 d5 2. Nf3 Nf6 3. e3 e6 4. Bd3 c5 5. b3 Nc6 6. O-O Bd6 7. Bb2 O-O 8. a3 b6
9. Nbd2 Bb7 10. Qe2 {Sambuev plays the Colle-Koltanowski a lot, and has had
this postion in many tournament games.} Qc7 $6 {This looks like normal
development -- it's hard to believe that after ...gxf6 Black's kingside will
be fatally weak -- but White's aggressive and precise response puts Black
under great pressure.} (10... a5 $11 {a nearly-Novelty, which SF and Leela
both rank as best.}) (10... cxd4 $5 {increases White's control on the e-file.}
11. exd4 Re8 12. Ne5 Qc7 13. f4 g6 14. c4 Bf8 15. Rac1 Rac8 16. c5 $14 {
1-0 (32) Sambuev,B (2573)-Richard,L (2100) Montreal CAN 2019}) (10... Rc8 11.
Ne5 (11. dxc5 Bxc5 12. b4 Be7 13. c4 a5 14. b5 Nb8 15. Rfd1 Nbd7 16. Rac1 Nc5
17. Bc2 Qe8 18. Ng5 g6 19. cxd5 Bxd5 20. e4 Bb7 21. Qf3 Nh5 22. h4 Qxb5 23. Ba1
f5 24. a4 Qc6 25. Bb3 fxe4 26. Qe3 Nf4 27. Ngxe4 Rcd8 28. f3 Rd3 29. Qe1 Ba6
30. Kh1 Rfd8 31. Nxc5 Bxc5 32. Qe5 {1-0 (32) Sambuev,B (2559)-Dunne,F (2224)
Ottawa CAN 2018}) 11... Ne7 {A common maneuver with the N -- you'll see it in
most of these games -- which increases Black's control of e4 and enables ...
Ng6 which blocks the attack on g6.} (11... Qc7 12. f4 cxd4 13. exd4 Ne7 14. c4
Qb8 15. Ndf3 Qa8 $6 (15... Rc7) 16. Rae1 Ne4 $2 17. Bxe4 dxe4 18. Ng5 $1 $16 f6
19. Nxe6 fxe5 20. fxe5 $1 Bxe5 (20... Rxf1+ 21. Rxf1 Bc7 22. Qf2 $4) 21. dxe5
Ng6 22. Nxf8 $18 Rxf8 23. Qg4 Qe8 24. e6 Qe7 25. Rxf8+ Nxf8 26. Qxg7+ Qxg7 27.
Bxg7 Kxg7 28. e7 Kf7 29. exf8=Q+ Kxf8 30. Kf2 Ke7 31. Ke3 {1-0 Sambuev,B (2524)
-Ouellet,M (2249) Edmonton 2018}) 12. dxc5 Bxc5 (12... bxc5 13. c4 Qc7 14. f4
Nf5 (14... a5 $5) 15. cxd5 Nxd5 16. Ndc4 $14 {1/2-1/2 (68) Sambuev, B (2539)
-Mareco,S (2645) chess.com INT 2017}) 13. Rad1 (13. b4 Bd6 14. c4 Ng6 15. Nxg6
hxg6 16. Rac1 $11 {1/2-1/2 (43) Sambuev,B (2548)-Roussel Roozmon,T (2454)
Montreal 2016}) 13... Qc7 14. c4 Ng6 15. Nxg6 hxg6 16. cxd5 Nxd5 17. Nc4 b5 18.
Ne5 Bd6 (18... Bxa3 19. Rc1 Qd6 20. Bxb5 {unclear.}) 19. Rc1 Qe7 20. b4 a6 21. Bd4
Rxc1 22. Rxc1 Rc8 23. Rxc8+ Bxc8 24. Qc2 Qc7 25. Qxc7 Bxc7 26. f4 $14 g5 $1 27.
fxg5 Nxe3 28. Nxf7 Nf5 29. Bxf5 exf5 30. g6 $14 {1/2-1/2 (56) Sambuev,B (2571)
-Samsonkin, A (2419) Toronto 2014}) 11. dxc5 bxc5 12. Bxf6 gxf6 13. c4 $1 {
Black must avoid having to play ...exd5, which would leave his kingside and
center a wreck...} Ne5 {...but doesn't find the best way to avoid it.} (13...
dxc4 $1 14. Nxc4 Be7 {White has better structure but Black has the B-pair.})
14. Nxe5 Bxe5 { When I first saw this game I thought, "If White could play
Rf3 then Bxh7+ would be a winning combo". That's true -- remove the f2-pawn
and Bxh7+ wins -- but it takes much more than just the recognition of a
standard tactical pattern to not only seriously consider but to actually play
White's next move in a tournament game...} 15. f4 $3 {Attacking the Be5 and
preparing Rf1-f3, but giving up a whole rook on a1! Leela and Stockfish both
rank this as their 1st choice} Bxa1 16. Bxh7+ {only move} (16. Rxa1 $4 f5 $19) 16... Kh8
{only move} (16... Kxh7 $2 {gets mated to} 17. Qh5+ Kg7 18. Qg4+ Kh7 19. Rf3 {#4}) (
16... Kg7 $2 17. Qg4+ {only move} $18 {transposes into the previous variation.}) 17. Qh5
{Critical Position Black is up a Rook, but has one move to stay in the game.
Can you find it?} Rfd8 $2 {After this, the position is similar to some of
Kasparov's attacking gems, where all of the defender's pieces are on the other
side of the board.} (17... Rg8 {only move} 18. Bxg8+ (18. Qh6 $4 Rg7 {only move} $19) (18. Nf3) (
18. Rf3 Rxg2+ $3 19. Kxg2 dxc4 {unclear.}) 18... Kxg8 19. Rxa1 (19. Qh6 $2 dxc4 $1 {
so the Bb7 stops the R lift}) 19... Qa5 20. b4 $5 (20. Nf1 Qc3 21. Rb1 {unclear.})
20... cxb4 21. Ne4 Qd8 22. Rd1 {with a still-exciting position.}) 18. Qh6 {only move}
$18 {A very loud "quiet move"? Or a standard attacking maneuver -- Closing the
Exits -- before bringing in reinforcements?} dxc4 (18... f5 {opens a line for
the Ba1 to come back to defend, but it's not enough:} 19. Bxf5+ Kg8 20. Rf3 $1
(20. Bh7+ Kh8 21. Rf3 $4 Bg7 $17) 20... Bg7 21. Rg3 Kf8 (21... f6 22. Bxe6+ Kf8
23. Qh7 $18 {breaking in on g8 next.}) 22. Rxg7 exf5 23. Rxf7+ Kxf7 24. Qh7+
$18) 19. Be4+ Kg8 20. Rf3 {only move} {Notice that Black's f7 and f6 pawns form a kind
of wall which boxes in the Black King and boxes out Black's other pieces.} Bxe4
21. Nxe4 Rd1+ 22. Kf2 Rd5 23. Rh3 $1 (23. Rg3+ {also wins.}) 23... f5 24. Rg3+
1-0
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