[Event "Mechanics' June TNM"]
[Site "San Francisco"]
[Date "2021.06.16"]
[Round "3.1"]
[White "Biyiasas, Theodore"]
[Black "Griffith, Kyron"]
[Result "0-1"]
[ECO "E33"]
[WhiteElo "1982"]
[BlackElo "2351"]
[Annotator "de Firmian, Nick"]
[PlyCount "152"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[WhiteTeam "United States"]
[BlackTeam "United States"]
[WhiteTeamCountry "USA"]
[BlackTeamCountry "USA"]

{[%evp 0,152,28,28,28,4,3,-1,-3,-22,0,0,8,21,41,40,40,40,57,60,68,46,59,19,28,
29,35,37,48,42,40,23,44,55,55,55,38,-46,33,59,74,80,192,50,44,-22,-22,-6,18,0,
24,26,62,24,144,144,144,144,144,182,137,80,80,92,92,94,102,102,102,95,92,85,85,
95,109,110,111,122,132,65,86,57,64,25,25,21,21,0,0,0,87,21,21,0,0,-12,-9,-9,
-22,-25,-8,-67,0,0,0,-20,0,0,0,0,0,0,0,0,90,90,90,90,94,48,48,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,4,-17,-18,-29983,-29984,-29989,-29982,-29991,-29990,
-29991,-29992,-29997,-29998,-29999,-30000]} 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4.
Qc2 Nc6 {Sometimes called the Zurich Variation. It's nowhere near as frequent
as the three big moves, but not for anything wrong with it.} (4... d5) (4... c5
) (4... O-O) ({And it's worth noting that the even less popular} 4... d6 {
outscores them all (and has been seen played by Carlsen).}) 5. Nf3 d6 6. Bd2 {
White goes with the gentle development of the dark-squared bishop, while
putting Black's counterpart on notice.} O-O 7. a3 Bxc3 8. Bxc3 Qe7 9. e3 a5 10.
b3 e5 11. Be2 (11. d5 $5 Nb8 12. Nd2 $14) 11... e4 12. Nd2 {[#] White has the
two bishops (although they have yet to come into their own), while Black looks
to maintain his advanced pawn. In sum the position favors White slightly, but
a whole game ahead.} Bf5 $146 (12... d5 13. Bb2 Bf5 14. Rc1 Rad8 15. h3 Rfe8
16. Qc3 h5 17. c5 Bd7 18. a4 h4 {1/2-1/2 (72) Quan,Z (2303)-Hutters,T (2400)
Kitchener 2003}) 13. h3 h5 {[#]} 14. g4 $5 {Radical.} (14. Qd1 $16 {seems
counterproductive but still intends to press forward on the kingside.}) 14...
hxg4 $6 {The open h-file favors White of course.} (14... Bg6 $1 $14) 15. hxg4
$16 Nxg4 $6 (15... Bxg4 $16 16. d5 Ne5 17. Nxe4 {still causes Black difficult
problems,} Nxe4 18. Qxe4 f5 19. Qf4) 16. Bxg4 $18 Bxg4 {[#]} 17. f3 $1 {
White gets a dream attacking scenario, with diagonals and files all pointing
to a king whose forces don't seem to care.} (17. Qxe4 Qxe4 18. Nxe4 Bf5 $11) (
17. d5 Ne5 $17) 17... Bf5 {[#]} 18. fxe4 $2 {Too soon! It was just the right 
(i.e. last) moment to evacuate White's own king and add another rook to the
fire:} (18. O-O-O $1 $18 Bg6 19. Nxe4 Bxe4 20. fxe4) 18... Bg6 $2 ({And Black
could have stopped that very arrangement:} 18... Bg4 $1 $17 {A defensive ...f5
takes care of the king, while ...Rae8 will still be uncomfortable for White's
king.}) 19. O-O-O $1 $18 {White is back on track.} Rfe8 20. Rdg1 $1 b5 $6 {
Objectively just making things worse, but in practice Black has to do
something to at least seem to be counterattacking.} (20... Bxe4 $2 21. d5 $1 f6
{no choice:} (21... Bxc2 $4 22. Rxg7+ Kf8 23. Rh8#) (21... Ne5 $2 22. Nxe4) 22.
Nxe4 Qxe4 23. Qh2 Qxe3+ 24. Bd2 {with multiple threats.}) (20... Qf6 {is a
better defense.} 21. Rg2 Rad8) 21. d5 $6 (21. cxb5 {would have called Black's
bluff.} Nb4 22. axb4 axb4 23. Bb2 (23. Bxb4 {is winning as well}) 23... d5 {
desperate to close the long diagonal, but now even} 24. Rxg6 fxg6 25. exd5 {
is disaster.}) 21... b4 {[#]} 22. Ba1 $3 {Excellently keeping the guns aimed.}
(22. dxc6 bxc3 23. Qxc3 Qe5 $11) 22... Ne5 23. a4 {Very logical, sealing the
queenside.} (23. c5 $1 $18 {is one of those computer moves that makes sense
eventually. The c-file stays closed, but c4 is available for the white knight,
and White gets there first. But who wants to stare down} a4 $5) 23... Qf6 ({On
} 23... c6 $16 {White has} 24. Nf1 {getting out of the way to play Qh2.}) 24.
Bd4 $6 {White is having trouble finding a knockout and divigates.} (24. Rg3 $18
) 24... Qf2 (24... c5 $5 $16 25. dxc6 Rac8 {is still better for White -- Black
hasn't broken through there yet.}) 25. Qd1 $1 {Another excellent solution by
Theo -- Black's knight has to seriously consider relocating (and opening the
long diagonal again).} Nd3+ 26. Kb1 $1 (26. Kc2 $2 Nc5 $11 {and White's knight
is pinned}) 26... Rxe4 {Best try, but with accurate defense insufficient.} 27.
Nxe4 Bxe4 28. Rxg7+ {Still good for White} ({Precarious but winning was} 28.
Ka1 $1 Bxh1 29. Qg4 $1 g6 (29... Kf8 30. Rxh1 $1 $18) 30. Rxh1 Ne5 31. Qh3 Kg7
32. Qh6+ Kf6 33. Qf4+) 28... Kf8 29. Ka1 (29. Rh8+ Ke7 $11) 29... Bxh1 {[#]}
30. Qxh1 $2 {The knight was more troublesome and should have been removed:} (
30. Qxd3 $1 $18 Re8 31. Qh7 Rxe3 32. Rg8+ Ke7 33. Bxe3 Qe1+ (33... Qxe3 {
White ignores the bishop and mates directly:} 34. Qh4+ f6 35. Qh7#) 34. Kb2
Qe2+ 35. Qc2 Qxe3 36. Qc1 $18 {White avoids the perpetual, when Black's king
is in trouble.}) 30... Qe1+ $2 (30... Ne1 $11 31. Bb2 (31. Rg8+ Ke7 $11) 31...
Nd3) 31. Qxe1 $16 Nxe1 {And it's into an ending, but there are still tactical
problems...} 32. Bf6 $1 Rc8 {[#]} 33. Kb1 (33. c5 $3 {There is still a mating
attack!} dxc5 34. e4 {The pawn goes to e6, the rook to h7.} c6 $1 (34... Nd3
35. Rh7 Ke8 36. e5 Nf4 37. e6 $1 fxe6 38. dxe6 Nxe6 39. Re7+) 35. d6 Ke8 36. e5
Nc2+ 37. Kb2 Nd4 38. Rh7 c4 $1 39. bxc4 c5 {White is better, but the win isn't
apparent just yet.}) 33... Nd3 34. Kc2 Nc5 35. Rh7 {[%cal Rh7h8]} Ke8 36. Bd4
Ne4 (36... Nb7 $16) 37. Rh4 Ng3 38. e4 (38. Kd3 $5) 38... Ke7 (38... Ne2 $16)
39. Bf2 (39. Kd3 $18 {It was surprising that Biyiasas didn't automatically put
his king vis-a-vis Black's knight to keep it off squares.}) 39... Ne2 40. Kd2
Nc3 41. Bd4 (41. Kd3 $16 {and again}) 41... Rg8 $11 42. Bxc3 Rg2+ 43. Kc1 bxc3
44. Rh3 c2 45. Rc3 Re2 46. Rxc2 Rxe4 47. Kd2 {Rh2-h8-a8xa5 takes a while, but
in any case the rook had to be activated.} Rh4 48. Kc3 Rh3+ 49. Kb2 f5 {[#]}
50. Rc3 $2 (50. Re2+ $11 Kf6 51. Re6+ Kg5 52. Re7) 50... Rh7 $2 ({And it was
surprising that Kyron didn't see} 50... Rxc3 $1 $19 {as winning:} 51. Kxc3 f4 {
just in time.} 52. Kd2 Kf6 53. b4 axb4 54. a5 f3 55. a6 f2 56. Ke2 f1=Q+ 57.
Kxf1 b3 58. a7 b2 59. a8=Q b1=Q+ 60. Ke2 Qc2+ 61. Ke3 Qc3+ $1 62. Kf2 Qxc4 {
and the Lomonosov Tablebase helpfully declares "Black mates in 75"}) 51. Re3+
Kf6 52. b4 f4 53. Re6+ Kf5 (53... Kg5 $1 $15 54. bxa5 Rh8) 54. bxa5 {Suddenly
White has chances!} f3 55. Re8 Rf7 56. a6 $1 {[%cal Ra6a7]} f2 57. a7 f1=Q 58.
a8=Q {If only Theo had more time...} Qxc4 59. Qc8+ Kf4 60. Qe6 Qb4+ 61. Kc1
Qc4+ 62. Kb2 Qb4+ 63. Kc1 Qa3+ 64. Kd2 Qb2+ 65. Kd1 Qb1+ 66. Kd2 {Threatening
mate with Qe3+.} Qa2+ 67. Kc1 Qa1+ 68. Kd2 Qd4+ 69. Kc1 Rf5 {[#]} 70. Qe2 Qa1+
{[#]} (70... Qxd5 $2 71. Qe3+ Kg4 72. Rg8+ $1 Qxg8 73. Qg1+ Kh5 74. Qxg8 $18) (
70... Rxd5 $2 71. Qh2+ Kg4 72. Rg8+) 71. Kd2 $4 (71. Kc2 $1 Qa2+ (71... Qxa4+
72. Kb2 Qd4+ {is drawn (Black takes d5, White initiates a perp) as long as
White avoids} (72... Qb4+ {is just perpetual}) {losing the d-pawn with check:}
73. Kb3 $4 ({the trade of queens and rook and two connected pawns vs. rook 
(almost always lost):} 73. Kc1 $4 {73.Kb1 0.00 [#]} Qa1+ $1 74. Kc2 Qa2+ 75.
Kc3 Qxe2 76. Rxe2 Rxd5) (73. Kc2 $11) (73. Ka3 $11) (73. Kb1 $11) (73. Kb1 $11
{and White is okay.} Qxd5 74. Qe3+ Kg4 75. Rg8+ Rg5 76. Qg1+ Kf4 77. Qf1+ Ke4
78. Qh1+ Kd4 79. Qh4+ Kc3 80. Qe1+ Kd3 81. Qf1+ Ke4 82. Qh1+ Kd4 83. Qh4+ Kc3
84. Qe1+ Kd3 85. Qf1+ Ke4)) 72. Kc3 Qxe2 73. Rxe2 Rxd5 74. Ra2 Ra5 75. Kb4 Ra6
76. a5 c6 {is drawn.}) (71. Kc2 $11 Qa2+ 72. Kc3 Qxe2 73. Rxe2 Rxd5 74. Kb4)
71... Rxd5+ {The worst of them all: mate follows shortly.Black mates.} 72. Kc2
Qxa4+ ({Slightly faster is} 72... Qa2+ 73. Kc1 Rc5+) 73. Kc3 Qa3+ 74. Kc2 Rc5+
75. Kd2 Qc3+ 76. Kd1 Qc1# {What an epic! Biyiasas outplayed Griffith to a
point, but he seemed to run out of batteries and collapsed at the end. But
credit to the New In Chess "2020 Swindle of the Year" winner (!) for keeping
his chances and grabbing them when they appeared.} 0-1

[Event "Mechanics' June TNM"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.2"]
[White "Winslow, Elliott"]
[Black "Harris, Harris"]
[Result "1-0"]
[ECO "B90"]
[WhiteElo "2278"]
[BlackElo "1827"]
[Annotator "de Firmian, Nick"]
[PlyCount "81"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

{[%evp 0,81,28,42,52,43,91,65,62,42,34,30,73,28,28,15,15,11,20,20,28,-33,8,0,
16,-30,42,-11,50,58,62,76,9,61,154,78,51,51,56,51,54,5,5,5,109,102,117,73,56,
40,40,-27,78,67,95,-39,146,93,93,49,66,52,167,115,104,58,88,-37,100,0,95,123,
148,140,148,148,148,183,179,151,29985,29986,29987,29988]} 1. e4 c5 2. Nf3 d6 3.
d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. h3 $5 {This move goes back to Weaver (not
Michael!) Adams in the 1950s, a poetic response to 5...a6. White aims to get
in g2-g4 after all.} e5 7. Nde2 Be7 ({The main battle involves the modern} 7...
h5 {(well, there are isolated instances in the 1970s), when the question
remains: whose h-pawn move is better? Top grandmaster discussion continues
with no clear result.}) 8. g4 O-O {All sorts of alternatives have been tried
within the last year here.} 9. Ng3 {White has a lot of moves he'd like to get
in, but only one at a time. So he aims for g4-g5 without allowing ...Nh5.} (9.
Be3 {is certainly one of them, with some pedigree:} Nbd7 10. a4 Nb6 11. Bg2 Be6
12. O-O Nc4 13. Bc1 Rc8 14. b3 Nb6 15. a5 Nbd7 16. Be3 {(That was quite a
sparring they went through!)} Re8 17. Nd5 Bxd5 18. exd5 Nf8 19. Ng3 N6d7 20.
Qd2 Ng6 21. Nf5 h6 {1/2-1/2 (47) Lombardy,W-Fischer,R New York 1958}) 9... Be6
(9... Ne8 $5 {aims at the dark squares before White can grab them, but White
still comes out on top.} 10. Nd5 Bh4 11. Be3 Nc6 12. Qd2 Nd4 $5 13. O-O-O (13.
Bxd4 exd4 14. Qxd4 {really isn't so bad, if a bit antithetical (often a pawn
for the dark squares is a fair trade).}) 13... Nf6 14. Nxf6+ Bxf6 15. c3 Qa5 $5
16. cxd4 $18 Qxa2 17. Qb4 {1-0 (35) Kupreichik,V (2535)-Dvoirys,S (2590)
Leeuwarden 1993}) 10. g5 $146 {[#]White has to be careful not to take on too
many obligations.} (10. Bg2 {was what few games had been played so far.}) 10...
Ne8 $146 {Could be a problem on b6.} (10... Nfd7 11. h4 Nc6 12. Nd5 b5 13. Be3
Rc8 14. Qd2 Nc5 15. O-O-O Bxd5 16. exd5 Na5 $16 {1-0 (31) Lambert,M (1962)
-Bello,J ICCF email 2018} 17. b4 $4 Nab3+) 11. h4 Nc6 {See previous concern.}
12. Be3 Qa5 13. Qd2 b5 14. Bg2 f6 15. O-O {White finally commits to the
kingside with the king (Black had clearly made 0-0-0 inhospitable).} fxg5 16.
hxg5 Rd8 $6 {This ends up being a problem, taking away a queen retreat. But
he's thinking about ...d5.} (16... Rc8 $16 {guards the knight in some
variations.}) 17. Nf5 $5 {White was trying to work the hanging knight on c6
into the works. But} (17. a4 $1 $18 {works better here:} Qb4 18. axb5 axb5 19.
Qd1 $1 (19. Nf5 {is something as well}) (19. Qc1 $5) 19... Qxb2 20. Nd5 {
is trouble for Black.}) 17... Nc7 (17... d5 $1 {was his intention, and he
shouldn't have assumed White had stopped it! White has a path to an advantage:}
18. Nxd5 Qxd2 19. Bxd2 Bc5 (19... Bxf5 $2 20. exf5 Rxf5 21. Nxe7+ Nxe7 22. Rad1
$18 {and the two bishops will cut up the knights.}) {when Stockfish surprises
with} 20. Be3 Bxe3 21. fxe3 $1 {[#] (the knight recaptures are actually just
as good)}) 18. a3 $16 {[%cal Ba2a3,Ba3b4] Suddenly Black's queen is concerned!}
b4 {[#]} 19. Nxe7+ {White had a "concept" that he couldn't let go of.} (19.
axb4 Qxb4 20. Rfd1 {was the sober approach, in the style of Mickey (not Weaver)
Adams.}) 19... Nxe7 20. Nd5 {What? Well, White wins a pawn!} (20. Na2 Qb5 {
White takes the pawn, but then has to contend with ...Ng6! with dangerous
kingside play.}) ({But best is} 20. Ne2 $16 {was a serious advantage, even if
Black still play. The kingside help is definitely significant. Note} Qb5 21.
axb4 Bc4 22. Rfd1 $1 {maintaining pressure as well as the pawn.}) 20... Ncxd5
21. exd5 Bf5 $5 (21... Bxd5 $2 22. axb4 Qb5 23. Ra5 $18) (21... Nxd5 $5 22.
axb4 Qb5 $1 (22... Qxb4 $4 23. Bxd5 Qxd2 24. Bxe6+) 23. Ra5 Nxe3 $1 24. Rxb5
Nxf1 25. Bxf1 axb5 26. Bxb5 {is still advantage White, but the glaring
problems (f-file? ...d5?) will require White to play with accuracy to collect
a point.}) 22. axb4 Qb5 {[#]} 23. b3 $6 ({White should try} 23. f4 $1 $16 exf4
24. Bxf4 {to cover e5} (24. Rxf4 Ng6 $16)) 23... Ng6 $11 {Black's counterplay
is substantial and rather scary. White now took a lot of time to not get
checkmated.} 24. f3 (24. f4 $1 $11 exf4 25. Bxf4 Bxc2 $1 26. Bxd6 $1 Rxd6 27.
Rxf8+ Nxf8 28. Qxc2 Qxb4 {leaves White with next to nothing.}) 24... Nh4 $17 {
Black has strong compensation.} 25. Bh1 {White's convoluted defense tricked up
his less experienced opponent but probably wasn't so brilliant.} (25. Bf2 $15
Nxg2 26. Kxg2) 25... Bc8 $6 (25... Bh3 $17 26. Rf2 {Perhaps some exchange
sacrifice was called for} Qe8 {is quite dangerous}) 26. c4 Qe8 (26... Qd7 $5
27. Qh2 Ng6 {regroups}) 27. Qh2 $1 {[%cal Rh2h4]} Nf5 ({Black should play} 
27... Qh5 $17 {threatening ...Rxf3, and it's hard to stop it.}) 28. Bb6 $5 {
Trying to harass Black but just helps to mobilize that rook.} (28. Bd2 Nd4 29.
f4 {is madness but seems to draw.}) 28... Rd7 29. f4 {[#]} (29. Rae1 $5 $15 Rb7
30. Bf2) 29... e4 $6 {Harris saw a new type of plus, a passed pawn, but White
can keep a pretty good eye on it.} (29... Rb7 $1 {would have been timely and
advantageous, since} 30. Rxa6 $4 Rb8 {works.}) 30. Rae1 Re7 31. Re2 {Wrong
rook probably.} (31. Rf2 $11) 31... h6 32. Rfe1 (32. Be3 $11 {remains equal.})
32... e3 $17 33. gxh6 $2 {[#]} (33. c5 $17 {is more resistant.} Nd4 34. cxd6
Nxe2+ 35. Qxe2 (35. Rxe2 Ref7 $17)) 33... gxh6 $2 (33... Rf6 $19 34. h7+ Kh8
35. Bxe3 Nxe3 {as pointed out by the computer, is a win. For Black.}) 34. Bf3
$1 $36 {The g-file cuts both ways.} Rg7+ (34... Kh7 $11) 35. Rg2 $16 {They
were scrambling at this point, with clocks running out.} Rxg2+ 36. Bxg2 {
Hoping for Bxe3!} ({White had been planning} 36. Kxg2 Qg6+ 37. Kh1 Ng3+ 38.
Qxg3 (38. Kg2 $2 Ne4+ 39. Kf1 Nd2+ 40. Ke2 Qc2 $19) (38. Kg1 Rxf4 $17) {but}
38... Qxg3 39. Rg1 Qxg1+ 40. Kxg1 Rxf4 41. Kg2 Bg4 {is won for Black.}) (36.
Qxg2+ $6 Kh7 $11) 36... Kh7 $2 {[#]} ({Better is} 36... Rf7 $1 {but White
still has his chances:} 37. Qh5 $1 $16) 37. Bxe3 $1 $18 {White produces a
tactical sequence that seems to work well.} Nxe3 38. Qg3 Rg8 39. Rxe3 Qh5 $2 (
39... Qf7 $18 40. Qe1 $1) (39... Rxg3 40. Rxe8 Bh3 (40... Bg4 41. c5) 41. Kh2)
40. Re7+ Kh8 41. Qc3+ {To Harris's credit, a hard fought battle with excellent
chances taken when they materialized.} 1-0

[Event "Mechanics' June TNM"]
[Site "San Francisco"]
[Date "2021.06.16"]
[Round "3.3"]
[White "Penagalapati, Abhinav"]
[Black "Argo, Guy"]
[Result "1-0"]
[ECO "A80"]
[WhiteElo "1916"]
[BlackElo "1845"]
[PlyCount "61"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[WhiteTeam "United States"]
[BlackTeam "United States"]
[WhiteTeamCountry "USA"]
[BlackTeamCountry "USA"]

1. d4 f5 2. Bf4 Nf6 3. e3 d6 4. Nc3 c6 5. Bd3 Qa5 6. Nf3 Nbd7 7. Bg3 g6 8. Ng5
Bh6 9. h4 Bxg5 10. hxg5 Ne4 11. Bxe4 fxe4 12. Qd2 Qf5 13. O-O-O d5 14. Bf4 b5
15. f3 exf3 16. gxf3 O-O 17. Rh6 Rf7 18. Rdh1 Nf8 19. Qh2 a5 20. Ne2 Qd7 21.
Be5 Qf5 22. Nf4 Ba6 23. Qg2 Rg7 24. Bxg7 Kxg7 25. Qh2 Qxg5 26. Rxh7+ Kf6 27.
Rh8 Rc8 28. Rg1 Qf5 29. Qh6 Kf7 30. Nd3 b4 31. Ne5+ 1-0

[Event "Mechanics' June TNM"]
[Site "San Francisco"]
[Date "2021.06.16"]
[Round "3.4"]
[White "Rajaram, Rohan"]
[Black "Clemens, Kristian"]
[Result "1/2-1/2"]
[ECO "D31"]
[WhiteElo "1530"]
[BlackElo "1919"]
[PlyCount "67"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[WhiteTeam "United States"]
[BlackTeam "United States"]
[WhiteTeamCountry "USA"]
[BlackTeamCountry "USA"]

1. d4 d5 2. c4 e6 3. Nc3 Be7 4. cxd5 exd5 5. Bf4 Nf6 6. e3 Bf5 7. Nge2 c6 8.
Ng3 Bg6 9. Bd3 Bxd3 10. Qxd3 g6 11. O-O O-O 12. Rfe1 Nbd7 13. e4 dxe4 14. Ngxe4
Nxe4 15. Nxe4 Nf6 16. Rad1 Nxe4 17. Rxe4 Bf6 18. Rde1 Qd7 19. Be5 Bxe5 20. Rxe5
Rad8 21. R1e4 Rfe8 22. Rxe8+ Rxe8 23. h3 Re6 24. Qe3 Qd5 25. Rxe6 fxe6 26. Qf4
Qxa2 27. Qb8+ Kg7 28. Qxb7+ Kh6 29. Qe7 Qb1+ 30. Kh2 Qf5 31. Qh4+ Kg7 32. Qe7+
Qf7 33. Qxf7+ Kxf7 34. Kg3 1/2-1/2

[Event "Mechanics' June TNM"]
[Site "San Francisco"]
[Date "2021.06.16"]
[Round "3.5"]
[White "Weng, Nicholas"]
[Black "Mercado, Adam"]
[Result "1-0"]
[ECO "C97"]
[WhiteElo "1731"]
[BlackElo "1731"]
[Annotator "de Firmian, Nick"]
[PlyCount "83"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[WhiteTeam "United States"]
[BlackTeam "United States"]
[WhiteTeamCountry "USA"]
[BlackTeamCountry "USA"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. h3
d6 9. c3 Na5 10. Bc2 c5 11. d4 Qc7 12. d5 Nc4 13. b3 Nb6 14. a4 Qb7 $5 $146 (
14... Ne8 $5) 15. Nbd2 Bd7 $6 16. c4 (16. a5 $5 Nc8) 16... bxc4 17. bxc4 a5 18.
Qe2 Rab8 19. g4 g6 20. Nb3 Qa6 21. Bd2 Qxc4 22. Qxc4 Nxc4 23. Nxa5 Nxd2 24.
Nxd2 Rb2 25. Rec1 Ra8 26. Nac4 Rb4 27. Rcb1 Rbb8 28. f3 Kg7 29. a5 Rxb1+ 30.
Nxb1 Ne8 31. Nb6 Ra7 32. Nd2 Bd8 33. Rb1 Rxa5 34. Nxd7 Ra7 35. Rb8 Bg5 36. Nc4
Rxd7 37. Rxe8 Bd8 38. Ba4 Ra7 39. Rxd8 Rxa4 40. Nxd6 Ra2 41. Rd7 Kf6 42. h4 1-0

[Event "Mechanics' June TNM"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.6"]
[White "Kaplan, Glenn"]
[Black "Heidari, Ako"]
[Result "0-1"]
[ECO "C26"]
[WhiteElo "1772"]
[BlackElo "1980"]
[PlyCount "85"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

1. e4 e5 2. Nc3 Nf6 3. g3 d5 4. exd5 Nxd5 5. Bg2 Ne7 6. Nf3 Nbc6 7. d3 g6 8.
O-O Bg7 {[#]} 9. Bd2 O-O 10. Qc1 Nf5 11. Nd1 Ncd4 12. Nxd4 Nxd4 13. Re1 Bg4 14.
f3 Be6 15. Nf2 Rc8 16. Ne4 c5 17. Bh6 f5 18. Bxg7 Kxg7 19. Ng5 Bg8 20. Nh3 c4
21. Qd2 cxd3 22. cxd3 {[#]} Nc2 23. Qe2 Qd4+ 24. Kh1 Nxa1 25. Rxa1 Rfe8 26. Nf2
Bd5 27. g4 f4 28. h4 b5 29. Nh3 h6 30. Qd2 a5 31. Qxa5 Qxb2 32. Rf1 Bf7 33. Rf2
Qb1+ 34. Bf1 Ra8 35. Qc7 Rxa2 36. Kg2 Rxf2+ 37. Nxf2 Qa2 38. g5 hxg5 39. hxg5
b4 40. Kg1 Qe6 41. Ne4 Qe7 42. Qb6 b3 43. Nd6 {time scramble - Black won} 0-1

[Event "Mechanics' June TNM"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.7"]
[White "Mahooti, James"]
[Black "Guo, Andrew"]
[Result "0-1"]
[ECO "E71"]
[WhiteElo "1800"]
[BlackElo "1925"]
[PlyCount "118"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. h3 Nbd7 6. Be3 O-O 7. Qd2 e5 8. d5
Nc5 9. f3 a5 10. g4 Nfd7 11. O-O-O Ra6 12. h4 f5 {[#]} 13. gxf5 gxf5 14. exf5
Nb6 15. Bxc5 dxc5 16. Bd3 Bxf5 17. Ne4 Bxe4 18. fxe4 Qf6 19. Kb1 Qf4 20. Nh3
Qxd2 21. Rxd2 h6 22. Rf2 Rxf2 23. Nxf2 Nc8 24. h5 {(scoresheet: "24.Nf2")} Rf6
25. Rh2 Nd6 26. Kc2 Rf4 27. Kd2 b6 28. Ke3 Nf7 29. Rg2 Ng5 {(see 24)} 30. Be2
Nf7 31. Bg4 Nd6 32. b3 Kh7 33. Bf3 Rf6 34. Nd3 Rf7 35. Rg6 Re7 36. Bg4 Rf7 37.
Bh3 Bf6 {[#]} 38. Rxf6 Rxf6 39. Nxe5 Kg7 40. Be6 Rf1 41. Nf3 Rh1 42. e5 Nf7 43.
Bg4 Ra1 44. e6 Nd6 45. Ne5 Kf6 46. Nc6 Nc8 47. Nd8 Rxa2 48. Nf7 Kg7 49. Kf4 Rb2
50. Ke5 Rxb3 51. d6 cxd6+ 52. Kd5 Rd3+ 53. Kc6 Ne7+ 54. Kd7 Ng8 55. Bf5 Rf3 56.
Nxd6 Kf8 57. Nc8 a4 {[#]} 58. Nxb6 a3 59. Bb1 Rb3 0-1

[Event "Mechanics' June TNM"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.8"]
[White "Makhanov, Gaziz"]
[Black "Rakonitz, David"]
[Result "1-0"]
[ECO "C01"]
[WhiteElo "1855"]
[BlackElo "1622"]
[Annotator "de Firmian, Nick"]
[PlyCount "59"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. c4 Nf6 5. Nf3 Be7 6. Nc3 O-O 7. h3 Nc6 8. Bd3
dxc4 9. Bxc4 {[#]} Na5 10. Bd3 b6 11. d5 Nb7 $2 {"Blockade the isolated pawn,
win it later" (Nimzovich); "Win it now" (Everybody else)} (11... Bb7) (11...
Bb4) ({Of course not} 11... Nxd5 $4) 12. Bf4 Nd6 13. Rc1 Bb7 14. Bb1 Rc8 15.
O-O c6 (15... Nh5 16. Bh2 Bg5 17. Nxg5) 16. Qd3 $2 (16. dxc6 Rxc6 17. Re1 $16)
16... g6 $2 (16... cxd5 {wins a pawn for nothing. Don't fear a mate that isn't
there!}) 17. Rfe1 $2 cxd5 18. Nd4 Qd7 19. Bc2 a6 20. Na4 Qd8 21. Nxb6 Qxb6 22.
Rxe7 Rfe8 23. Bxd6 Rxe7 24. Bxe7 Ne4 25. Ba3 Rc4 26. Rd1 Qf6 27. f3 Ng3 {
[#] Black has a real threat of 28...Rxd4, but White has some threats of his
own.} 28. Rd2 $6 (28. Qe3 $1 {is the most threatening and winning.}) 28... Rxd4
$2 (28... Qxd4+ 29. Qxd4 Rxd4 30. Rxd4 Ne2+ 31. Kf2 Nxd4 32. Bd3 {sees Black
carrying out his threat but still on some trouble in the ending. Nonetheless,
this is better than...}) 29. Qe3 $1 Rxd2 $4 30. Qe8+ 1-0

[Event "Mechanics' June TNM"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.9"]
[White "Rajaram, Anika"]
[Black "Gerstoft, Philip"]
[Result "1-0"]
[ECO "D23"]
[WhiteElo "1860"]
[BlackElo "1788"]
[Annotator "de Firmian, Nick"]
[PlyCount "75"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Qb3 dxc4 5. Qxc4 Bf5 6. Nc3 Nbd7 7. g3 e6 8.
Bg2 Be7 9. O-O O-O 10. Re1 ({A famous trap is} 10. Rd1 $4 Bc2 {threatening ...
Nb6!}) 10... Ne4 11. Qb3 Nb6 12. Be3 a5 13. Ne5 a4 14. Qd1 Nf6 15. f3 a3 16. b3
Bb4 17. Qc1 Nbd5 18. Bd2 Nc7 19. e3 c5 {[#]} 20. Ne2 Bxd2 21. Qxd2 Nd7 22. Nc4
b5 23. Nd6 Bg6 {[#]} 24. f4 Ra6 25. Nb7 Qe7 26. Rac1 c4 27. bxc4 b4 28. c5 Nf6
29. Nd6 Rb8 30. e4 Nfe8 {[#]} 31. f5 exf5 32. exf5 Bh5 33. Nf4 Qg5 34. Qd3 Ra5
35. Qb3 Nxd6 36. cxd6 Ne8 37. d7 Nd6 38. Rc8+ 1-0

[Event "Mechanics' June TNM"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.10"]
[White "Hao, Max"]
[Black "Riese, Kayven"]
[Result "1-0"]
[ECO "A90"]
[WhiteElo "1804"]
[BlackElo "1900"]
[PlyCount "112"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

1. d4 e6 2. c4 f5 3. g3 Nf6 4. Bg2 d5 5. Nf3 Bd6 6. O-O O-O 7. Nc3 c6 8. Bf4
Bxf4 9. gxf4 Nbd7 10. Qc2 dxc4 11. Ne5 Nb6 12. e3 Nfd5 13. Qe2 Bd7 14. Nxc4
Nxc4 15. Qxc4 Rf6 16. h3 Rg6 17. Kh2 Qh4 18. Qe2 Rf8 {[#]} 19. Rg1 Nf6 20. Bf3
Rh6 21. Rg3 Be8 22. Rag1 Rf7 23. Kg2 Re7 24. Kf1 Bh5 25. Rh1 Kf8 26. Bxh5 Nxh5
27. Rg5 Rd7 28. Qf3 g6 29. Na4 Kf7 30. Nc5 Rc7 31. Nd3 Nf6 32. Ne5+ Kg7 33. Qg2
Ne4 34. Nf3 {[#]} Qxf2+ 35. Qxf2 Nxf2 36. Kxf2 c5 37. dxc5 Rxc5 38. Nd4 Kf6 39.
Rgg1 e5 40. fxe5+ Kxe5 41. Rc1 Rxc1 42. Rxc1 Rxh3 43. Nf3+ Kd5 44. Rc7 b6 45.
Rxa7 h6 46. Rf7 Ke4 47. Kg2 Rh5 48. b4 g5 49. a4 g4 50. Nd4 Rg5 51. a5 bxa5 52.
bxa5 h5 {[#]} 53. Nxf5 h4 54. a6 g3 55. a7 Rg8 56. Nxh4 Kxe3 1-0

[Event "Mechanics' June TNM u1800"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.11"]
[White "Uzakbaev, Nursultan"]
[Black "Imbens, Andrew"]
[Result "1-0"]
[ECO "E61"]
[WhiteElo "1513"]
[BlackElo "1253"]
[PlyCount "57"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

{[%evp 0,55,21,12,27,24,47,63,38,38,37,22,10,30,10,4,-8,4,6,17,12,25,17,21,25,
24,31,27,73,73,73,-25,-22,-59,-42,-28,-13,-65,-38,-80,-25,-41,13,-45,-46,-88,
-44,-144,-11,-18,101,119,390,322,478,414,447,447]} 1. d4 Nf6 2. Nf3 g6 3. c4
Bg7 4. Nc3 O-O 5. Bg5 h6 6. Bd2 d6 7. e4 e5 8. d5 a5 9. a3 Bd7 10. Bd3 Na6 11.
h3 $6 (11. b3) 11... Nc5 12. Bc2 a4 13. Be3 c6 14. Bxc5 dxc5 15. Nxe5 Nxe4 16.
Bxe4 Bxe5 17. O-O Re8 18. Qc2 Qg5 19. Qd3 Qf4 20. g3 Qg5 21. Bg2 Bf5 22. Ne4
Qe7 23. Rfe1 Qd8 24. g4 Be6 25. Nxc5 Bc8 26. dxc6 Qb6 27. cxb7 Bxb7 28. Nxb7
Rab8 29. c5 1-0

[Event "Mechanics' June TNM u1800"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.12"]
[White "Quin, Leon"]
[Black "Sun, Kevin"]
[Result "1-0"]
[ECO "B21"]
[BlackElo "1491"]
[Annotator "de Firmian, Nick"]
[PlyCount "81"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

{[%evp 0,63,19,31,72,2,12,12,23,-12,-13,-11,-2,8,9,22,46,-18,-26,-31,-21,-13,
-19,-51,-46,-38,-38,-73,-67,-67,-67,-34,-9,-54,-60,-60,-58,-74,104,127,146,111,
116,107,121,121,121,95,124,97,100,102,113,101,120,110,104,44,95,107,114,111,
145,155,210,217]} 1. e4 c5 2. f4 d5 3. exd5 Nf6 4. Bb5+ Bd7 5. Bxd7+ Qxd7 6. c4
e6 7. Qe2 Bd6 8. d3 O-O 9. dxe6 fxe6 10. Nf3 Nc6 11. O-O Rae8 12. Nc3 e5 13. f5
Nd4 14. Qd1 Nxf5 15. Bg5 h6 16. Bxf6 {[#]} Ne3 $1 {Simple recaptures favor
White} 17. Qe2 Nxf1 18. Bh4 {[#]} Nxh2 $4 {But here Kevin founders.} (18... g5
19. Bf2 e4 $1 20. Nxe4 g4 {and Black's "raining pawns" are almost too much for
White to handle. Almost in that} 21. Rxf1 gxf3 22. gxf3 {isn't so bad; Black's
advantage is not quite substantial.}) 19. Nxh2 {Now White's position is
excellent. Two knights for the rook (and a pawn, but Black should just give
*that* away), outposts everywhere (d5, e4). Stockfish: "+-".} Be7 (19... e4 20.
Nxe4 b6 {is the computer's "best try."}) 20. Bxe7 Qd4+ 21. Kh1 Rxe7 22. Nf3 Qg4
23. Nd5 Ree8 24. Qe4 Qxe4 25. dxe4 {It really should be a knight on this
square but that's not a very large complaint.} g5 {And now f5 is a supersquare.
} 26. Kg1 Kg7 27. Nc7 Re7 28. Nb5 a6 29. Nd6 Kg6 30. Rd1 $6 (30. Rf1 $1) 30...
g4 $6 31. Nh4+ Kh7 32. Ndf5 {(An embarrassment of rich outposts)} Rc7 33. Rd6
h5 34. Rh6+ Kg8 35. Ng6 Rfc8 36. Nge7+ Rxe7 37. Nxe7+ Kg7 38. Nxc8 Kxh6 39. Nd6
Kg5 40. g3 b6 41. a4 1-0

[Event "Mechanics' June TNM u1800"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.13"]
[White "Suarez, Sebastian"]
[Black "Pimpalkhare, Nikhil"]
[Result "1-0"]
[ECO "C55"]
[WhiteElo "1422"]
[PlyCount "113"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

{[%evp 0,32,18,36,36,31,42,28,10,11,26,14,75,58,35,37,25,28,16,11,24,-6,2,-66,
26,25,7,4,47,47,55,37,46,44,48]} 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3 h6 5. Nc3
g6 6. Nd5 Bg7 7. Be3 O-O 8. h3 d6 9. Qd2 Kh7 10. c3 Na5 11. Bb5 c6 12. Nxf6+
Qxf6 13. Ba4 b5 14. Bc2 c5 15. a4 bxa4 16. Rxa4 Nc6 17. Bb3 Bd7 18. Ra6 Rfb8 {
[#]} 19. Ng5+ Kg8 20. Bd5 Rb6 21. Rxb6 axb6 22. Ke2 Rf8 23. Nxf7 Rxf7 24. Bxf7+
Qxf7 25. Bxh6 {[#]} d5 26. Ra1 c4 27. Bxg7 cxd3+ 28. Qxd3 dxe4 29. Qxe4 Kxg7
30. Qe3 Qb3 31. Qd2 Be6 32. Rd1 Qb5+ 33. Ke1 Qc4 34. Qe3 Qb3 35. Rd2 Qb5 36. f4
Bf7 37. f5 Qc5 38. Qg5 Qg1+ 39. Ke2 Bc4+ 40. Kf3 Qf1+ 41. Kg3 Qxf5 42. Qxf5
gxf5 43. Rd7+ Kf8 44. Rd6 Ne7 45. Rxb6 Kf7 46. b3 Be6 47. c4 f4+ 48. Kf3 Bf5
49. g3 fxg3 50. Kxg3 Ng6 51. h4 e4 52. h5 Ne7 53. Kf4 Bh7 {[#]} 54. c5 e3 55.
Kxe3 Nd5+ 56. Kd4 Nxb6 57. cxb6 1-0

[Event "Mechanics' June TNM u1800"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.14"]
[White "Rex, Tobias"]
[Black "Cooper, Lee"]
[Result "1/2-1/2"]
[ECO "A10"]
[BlackElo "1529"]
[Annotator "de Firmian, Nick"]
[PlyCount "115"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

{[%evp 0,115,19,-12,-4,-1,6,49,33,-8,8,13,12,28,38,49,39,10,38,31,82,72,70,70,
67,67,67,1,-40,-22,31,43,23,41,22,33,149,136,132,128,122,126,126,132,148,130,
132,106,108,105,109,105,173,180,166,180,180,77,176,172,198,171,171,81,114,103,
108,88,93,126,115,123,134,92,90,90,84,76,84,89,205,469,542,495,918,972,997,1,4,
0,0,0,0,0,0,0,0,-17,-10,-13,0,0,0,0,0,-550,-682,-952,-960,-988,0,0,0,0,0,0,0,0]
} 1. c4 e6 2. e4 b6 3. Nc3 Bb7 4. g3 Bb4 5. Nge2 Ne7 6. Bg2 O-O 7. O-O Nbc6 8.
d3 Ng6 9. Be3 Nce7 10. a3 Bxc3 11. Nxc3 c5 12. b4 d6 13. d4 cxd4 14. Bxd4 Rc8
15. Qe2 Nc6 16. Rfd1 Nxd4 17. Rxd4 Ne7 18. Rad1 d5 19. exd5 exd5 20. Nxd5 Nxd5
21. Bxd5 Qc7 22. Bxb7 Qxb7 23. R1d3 Rfe8 24. Re3 Kf8 25. Qd3 g6 26. Rd7 Qc6 27.
Qd4 Kg8 28. Rxa7 Red8 29. Qg4 Rd6 30. Qf3 Qxc4 31. Rc3 Rd1+ 32. Qxd1 Qxc3 33.
Qd5 Qf6 34. Ra8 Rxa8 35. Qxa8+ Kg7 36. Kg2 Qd4 37. Qc6 h5 38. h4 Kh6 39. b5 Qd8
40. a4 Qb8 41. a5 bxa5 42. b6 a4 43. Qxa4 $4 (43. Qc7) (43. b7) 43... Qxb6 44.
Qf4+ Kg7 45. Qe5+ Qf6 46. Qe2 Qd4 47. f4 Qd5+ 48. Kh3 Qh1+ 49. Qh2 Qxh2+ 50.
Kxh2 Kf6 51. Kg2 Kf5 52. Kf2 $4 (52. Kf3) 52... Kg4 53. Kg2 f6 $1 54. Kf2 g5 $4
(54... Kh3 $1 55. Kf3 f5 56. Kf2 Kh2 57. Kf3 Kg1) 55. hxg5 fxg5 56. fxg5 Kxg5
57. Kf3 Kf5 58. Kf2 1/2-1/2

[Event "Mechanics' June TNM u1800"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.15"]
[White "Carron, Joel"]
[Black "Starr, Albert"]
[Result "1-0"]
[ECO "C42"]
[WhiteElo "1610"]
[BlackElo "1609"]
[PlyCount "73"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

1. e4 e5 2. Nf3 Nf6 3. Nc3 Bb4 4. Nxe5 Qe7 (4... O-O $5) 5. Nf3 Nxe4 6. Nd5 Qc5
{[#]} 7. Ne3 O-O 8. c3 Nc6 9. cxb4 Nxb4 10. a3 Nd5 11. Qc2 Ndf6 12. Qxc5 Nxc5
13. b4 Ne6 14. Bc4 c6 15. O-O d5 16. Bd3 g6 17. Bb2 Nh5 18. g3 Bd7 19. Ng4 f6
20. Ne3 Rad8 21. Nd4 Nc7 22. Rfe1 b6 23. Rac1 c5 24. bxc5 b5 25. c6 Be8 26.
Nxb5 Rb8 27. Nxc7 Rxb2 28. Nxe8 Rxe8 29. c7 f5 30. c8=Q Rxc8 31. Rxc8+ Kg7 32.
Nxd5 Rxd2 33. Re7+ Kh6 34. Bc4 Rd4 35. h4 f4 36. g4 Ng7 37. Nf6 1-0

[Event "Mechanics' June TNM u1800"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.16"]
[White "Ballantyne, Andrew"]
[Black "Tsolias, Georgios"]
[Result "1-0"]
[ECO "C02"]
[WhiteElo "1251"]
[BlackElo "1679"]
[Annotator "de Firmian, Nick"]
[PlyCount "41"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Qb6 6. Bd3 cxd4 7. cxd4 Bd7 8. O-O
Nxd4 9. Nxd4 (9. Nbd2) 9... Qxd4 10. Nc3 a6 11. Qe2 Ne7 12. Kh1 Nc6 13. f4 Nb4
14. Rd1 Nxd3 (14... Bc5 $5) 15. Rxd3 Qc4 (15... Qb6 $5) 16. Be3 {[#]} (16. b3
Qc7 17. Bb2) 16... Bb5 17. Nxb5 Qxb5 18. Rc1 $146 {[#]} (18. f5 exf5 19. Bg5 h6
20. Bh4 Qc4 21. Bf6 Rg8 22. Rad1 Qe4 23. Rxd5 gxf6 24. Qd2 Be7 25. exf6 Qxd5
26. Qxd5 Rd8 27. Qf3 {1-0 (47) Tupy,M-Kubala,M (2145) Chrudim 1993}) 18... Qd7
$4 (18... Be7 19. Qc2 (19. Rc7 Bd8 $17) 19... Qd7 20. Rc3 Bd8 $15) 19. Rdc3 Be7
20. Rc7 O-O $2 21. Rxd7 1-0

[Event "Mechanics' June TNM u1800"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.17"]
[White "Wilson, Stephen"]
[Black "Hack, Richard"]
[Result "0-1"]
[ECO "C55"]
[WhiteElo "1242"]
[BlackElo "1569"]
[PlyCount "100"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. c3 $6 Nxe4 5. d4 exd4 6. cxd4 d5 7. Bb5 Bg4
8. Nbd2 Qd6 9. a3 Be7 10. O-O O-O 11. Bxc6 bxc6 12. Re1 Nf6 13. b4 a5 14. bxa5
Rxa5 15. Nb3 Raa8 16. Bg5 h6 17. Bc1 Rfe8 18. Nbd2 Bf8 19. Bb2 Rxe1+ 20. Qxe1
Rb8 21. Rb1 Bf5 22. Nh4 Bxb1 23. Qxb1 Qf4 24. Nhf3 Bxa3 25. g3 Qd6 26. Kg2 Rxb2
27. Qf5 Qd7 28. Qd3 Bd6 29. h3 Rb8 30. g4 Re8 31. Kf1 Ne4 32. Kg2 Qe6 33. Kf1
Nxd2+ 34. Qxd2 Qe4 35. Ng1 Qb1+ 36. Kg2 Re1 37. Nf3 Bb4 38. Qf4 Bd6 39. Qf5
Qxf5 40. gxf5 Rc1 41. h4 c5 42. dxc5 Bxc5 43. h5 d4 44. Ne5 Rd1 45. Kf3 d3 46.
Nd7 Bd4 47. Ke4 Bxf2 48. Ne5 Re1+ 49. Kf4 Rxe5 50. Kxe5 d2 0-1

[Event "Mechanics' June TNM u1800"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.18"]
[White "Singer, Aleksandra"]
[Black "Parsons, Stephen"]
[Result "0-1"]
[ECO "C45"]
[WhiteElo "949"]
[BlackElo "1517"]
[Annotator "de Firmian, Nick"]
[PlyCount "62"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nxc6 (5. Nc3 d6 (5... e6) (5...
e5)) 5... bxc6 6. Nc3 (6. e5 Qa5+) 6... e5 7. Bc4 Bb4 8. Bd2 O-O 9. Qf3 d5 10.
exd5 Bg4 11. Qd3 e4 12. Nxe4 Bxd2+ 13. Kxd2 cxd5 14. Nxf6+ Qxf6 {[#]} 15. Bxd5
Bf5 16. Qf3 Rfd8 17. Kc1 Qg5+ 18. Kb1 {[#]} Bxc2+ 19. Kxc2 Rxd5 20. Rad1 Qg6+
21. Rd3 Rc8+ 22. Kd2 Rxd3+ 23. Qxd3 Qf6 24. Rc1 Qxf2+ 25. Qe2 Qxe2+ 26. Kxe2
Rxc1 27. Kd2 Rg1 28. a4 Rxg2+ 29. Kc3 f5 30. b4 f4 31. b5 f3 0-1

[Event "Mechanics' June TNM u1800"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.19"]
[White "Stimatze, Justin"]
[Black "Morgan, Jacob"]
[Result "0-1"]
[ECO "A07"]
[BlackElo "1365"]
[Annotator "de Firmian, Nick"]
[PlyCount "98"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

{[%evp 0,45,22,23,23,-9,10,10,10,9,10,-3,-2,5,20,-7,8,7,7,7,60,30,31,30,24,15,
43,29,33,-56,-62,-93,-85,-111,-111,-248,-136,-114,-112,-124,-98,-93,-79,-101,
-76,-69,42,-76]} 1. Nf3 Nf6 2. g3 e6 3. Bg2 d5 4. O-O Be7 5. d3 O-O 6. Nbd2
Nbd7 7. Re1 b6 8. e4 dxe4 9. dxe4 c5 10. b3 Qc7 11. a4 Bb7 12. Qe2 e5 13. Ba3
Rad8 14. c4 Nb8 15. Bc1 Nc6 16. h4 ({One of the two scoresheets has} 16. h3 {
(which is a better move, see move 18)}) 16... Nb4 17. Qd1 Bc8 18. Re2 Bg4 19.
Bb2 Nd3 20. Bc3 Rd7 21. Re3 Rfd8 22. Bf1 Bf8 23. Qc2 Nb4 24. Qc1 Nc6 25. Ng5 h6
26. Ngf3 Nd4 27. a5 Bxf3 28. Nxf3 Nxf3+ $5 (28... Nxb3 $2 29. Bxe5 $1 {leads
to nothing good}) (28... Ng4 $1 {first covers e5 and threatens b3. So} 29. Bxd4
cxd4 30. axb6 axb6 31. Rd3 f5 $5 32. Nd2 Nf6 {puts White under pressure.}) 29.
Rxf3 Nxe4 30. Be1 (30. axb6 axb6 31. Bg2 $5 {since if ...Nxc3 White can head
for d5 with good compensation in the bishop of opposite color middlegame.})
30... Nf6 31. Bh3 {[#]} Rd6 $2 {The worst square.} (31... e4 $1 {is the
fragile preference of the computer:} 32. Re3 (32. Bxd7 exf3 33. Bh3 Re8) 32...
Rd3 33. Rxd3 (33. Bc3 Rxe3 34. Qxe3 Rd3 35. Qe1 e3 $1 36. Bxf6 exf2+ 37. Qxf2
Rxg3+ 38. Bg2 gxf6 39. axb6 axb6 40. Qxf6 Rg6 {is more precarious for White's
king than Black's}) 33... Rxd3 34. Bf1 Rxb3 35. Qc2 Rf3 (35... Rb4 $5)) 32. g4
$2 {An unjustified assault that should backfire.} (32. Re3 e4 33. Bc3 {is
equal -- the difference is one move!}) 32... Rd3 $1 33. Re3 Rxe3 (33... e4 $1
34. Bc3 (34. axb6 axb6 35. g5 Rxe3 36. fxe3 hxg5 37. hxg5 Nh7) 34... Rxe3 35.
Qxe3 (35. fxe3 Qg3+) 35... Rd3) 34. fxe3 (34. Qxe3 e4) 34... e4 35. g5 hxg5 36.
hxg5 Nh7 37. Bh4 {[#]} Nxg5 $1 38. Bxg5 Qg3+ 39. Bg2 Qxg5 {Black is way ahead
of White in pawns and threats. The rest is mopping up.} 40. Ra2 Rd3 41. axb6
axb6 42. Ra6 {Desperation} Qg4 43. Rxb6 Rd1+ 44. Qxd1 Qxd1+ 45. Kf2 Qd2+ 46.
Kg3 Qxe3+ 47. Kg4 Qf2 48. Bxe4 g6 49. b4 f5+ 0-1

[Event "Mechanics' June TNM u1800"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.20"]
[White "Reed, Paul Henry"]
[Black "Cao, Danny"]
[Result "1-0"]
[ECO "D11"]
[WhiteElo "1322"]
[BlackElo "887"]
[Annotator "de Firmian, Nick"]
[PlyCount "86"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

1. Nf3 d5 2. c4 c6 3. g3 Bg4 {A solid system for every level from the best
grandmasters down -- even to these players!} 4. Bg2 Nf6 5. O-O Nbd7 6. d4 e6 7.
Nc3 {Perhaps White should do something about the c-pawn, like trade it.} Be7 (
7... dxc4 $5) 8. Qc2 O-O 9. Re1 $6 Rc8 (9... dxc4 $1 10. e4 b5 {Certainly
White has long-term compensation, but it's probably not a good bet.}) 10. Bf4 {
And here White could get off the c-file:} (10. Qb3) 10... Bxf3 {Black is
unsure of himself.} (10... dxc4) 11. Bxf3 Re8 12. Rad1 Nf8 {Black is so intent
on not taking on c4, now he's doing real harm to his position.} 13. e4 dxe4 14.
Nxe4 {A pawn transformation familiar from many opening, Caro-Kann, Center
Counter/Skandinavian, and of course various Queen's Gambit lines (which,
really, the Catalan is one).} h6 15. Qb3 Nxe4 16. Bxe4 Ng6 $2 {[#] White
finally had an actual threat (to b7) which should have been defended directly.
Now White can take "a tempo" and Black falls apart.} 17. Bxg6 (17. d5 $1 {
is an exciting alternative. White looks to take on c6 (attack Black's queen)
and cxb7 (on the rook) before recapturing on f4. And if Black trades off the
c-pawn first on d5...)} cxd5 (17... Nxf4 18. dxc6 Qc7 19. cxb7) 18. cxd5 Nxf4
19. dxe6 {then White goes the other way, with exf7+ a disaster!}) 17... fxg6
18. Rxe6 {This should turn out okay.} Qd7 19. Rxg6 {Taking the second pawn is
the most commital but ultimately best.} Qf5 {[#]} (19... Bf6 20. Qd3 {defends
the rook (and stops ...Qf5).}) 20. Qd3 $2 {Too soon!} (20. c5+ $1 {looks to
play back to e6 and to safety with the rook, and if Black blocks,} Qf7 ({or} 
20... Qd5) (20... Kh7 21. Re6 $1) ({One fun line is} 20... Kf8 $2 21. Rxh6 $1)
21. Be5 $1 {(the rook can't be taken!)} Bf8 {and now White gets away various
ways, push the h- or f-pawn, head back to g4 right away, guard it with the
queen on c2 or d3.}) 20... Qxd3 21. Rxd3 {[#]} Bf6 $2 (21... Kf7 $1 22. Rg4 h5
$1 {[#] Now it really is trapped! White can "bail out" and get a bishop and
two pawns for the rook with} 23. Rg5 $1 Bxg5 24. Bxg5 {but after} Re2 {White
has no advantage and has to be careful himself to draw.}) 22. Bxh6 $6 {Now
it's going to be *three* pawns for the Exchange! But better was} (22. Be5 $1 {
clearing the safe path Rg4-e4, maybe (maybe not) giving back a pawn but with a
won ending.}) 22... Kh7 (22... Kf7 {was more active. Black is worse but has
some chance.}) 23. Rxf6 gxf6 24. Be3 Rcd8 25. d5 cxd5 26. cxd5 b6 27. Rd2 Rd7
28. d6 Rc8 29. Kg2 Kg6 30. g4 Rc6 31. Bf4 f5 32. g5 (32. f3 {and h2-h4-h5
might be simpler}) 32... Rc4 33. Kg3 Re4 34. h4 Rc4 35. Be5 $2 Rg4+ 36. Kh3 Kh5
37. Bg3 $6 Re4 $2 (37... f4 $1 38. Rd4 $1 fxg3 39. Rxg4 gxf2 40. Rf4 Rxd6 {
requires White to exhibit technique still.}) 38. f4 Re6 39. Rd5 Rexd6 40. Rxf5
Rd3 41. Rf6 R7d6 42. Rxd6 Rxd6 43. f5 Rd3 {Time Scramble: White won 1-0 51 or
so.} 1-0

[Event "Mechanics' June TNM u1800"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.21"]
[White "Cohee, Jim"]
[Black "Griso, Simone Pagan"]
[Result "0-1"]
[ECO "A00"]
[WhiteElo "1612"]
[BlackElo "1098"]
[PlyCount "72"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

1. Nf3 Nf6 2. g3 e6 3. Bg2 d5 4. d3 Bc5 5. O-O O-O 6. Nbd2 Nbd7 7. c3 b6 8. d4
Bd6 9. Re1 Bb7 10. Qc2 c5 11. e4 dxe4 12. Ng5 cxd4 13. Ndxe4 Qc7 14. Nxf6+ Nxf6
15. Bxb7 Qxb7 16. cxd4 Bb4 17. Bd2 Bxd2 18. Qxd2 Rad8 19. Qf4 Rd5 20. Rac1 h6
21. Ne4 Nxe4 22. Rxe4 Rc8 23. Qe3 Rxc1+ 24. Qxc1 Ra5 25. Qc2 Rxa2 26. Re1 Qd5
27. Qc3 Qa5 28. Rc1 Qb5 29. Rc2 Ra4 30. Rc1 a5 31. Qd2 Rb4 32. Rc8+ Kh7 33.
Qc2+ Qf5 34. Qc3 Qb1+ 35. Qc1 Qxc1+ 36. Rxc1 Rxb2 0-1

[Event "Mechanics' June TNM u1800"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.22"]
[White "Casares, Nick Jr"]
[Black "Hancock, Trent"]
[Result "1-0"]
[ECO "C56"]
[WhiteElo "1600"]
[PlyCount "35"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d4 exd4 5. Bg5 Be7 6. Nxd4 O-O 7. Nc3 b6 8.
O-O Bb7 9. Re1 Ne5 10. Bb3 c5 11. Nf5 d6 12. Nxe7+ Qxe7 13. Bd5 Nc6 14. f4 Qd7
15. Bxf6 gxf6 16. Bxc6 Bxc6 17. Nd5 Rae8 18. Nxf6+ 1-0

[Event "Mechanics' June TNM u1800"]
[Site "San Francisco"]
[Date "2021.06.15"]
[Round "3.23"]
[White "Cunningham, Thomas"]
[Black "Ahrens, Richard"]
[Result "1/2-1/2"]
[ECO "C57"]
[WhiteElo "971"]
[BlackElo "1228"]
[PlyCount "44"]
[EventDate "2021.06.01"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Nxd5 6. Nxf7 Kxf7 7. Qf3+ Ke6
8. Nc3 Nce7 9. O-O g6 10. d4 c6 11. Qg4+ Kf6 12. dxe5+ Kg7 13. Qg3 Be6 14. Bg5
Nf5 15. Bxd8 Nxg3 16. fxg3 Rxd8 17. Rad1 Be7 18. Ne4 Rhf8 19. Bd3 Ne3 20. Rxf8
Nxd1 21. Rf3 Nxb2 22. Be2 Bxa2 1/2-1/2

