15: The World - Pogonina,N, The Chessgames Challenge

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Analysis by Fritz 11:

1. (0.14): 18.cxd5 cxd5 19.Qa4 Rc7 20.Nb3 Be7 21.b5 Rxc1 22.Rxc1 Qb8 23.Ne1 Bb7 24.Nd3 Rc8 25.Rxc8+ Bxc8 26.Nb4 Bxb4 27.Qxb4 Qc7 28.e3 Qc2

2. (0.07): 18.e4 a5 19.bxa5 bxa5 20.Qc3 c5 21.cxd5 cxd4 22.Qxc8 Qxc8 23.Rxc8 Rxc8 24.Bh3 Rd8 25.dxe6 Nc5 26.e5 Be7 27.exf7+ Êxf7 28.Bg4

18.e3
18.a3
18.e4

all with the same eval:

(+0.15) d=23

It's (black's) response to all three moves is the same:

18...Be7

18.a3 and 18.e3 simply transposed after that by playing each other at move 19. The line then runs out:

19...b5 20.cxd5 cxd5 21.Qd3 a6 22.Nb3 Rxc1 23.Rxc1 Qb8 24.Nc5 Rc8 25.Qb3 Nxc5 26.bxc5

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eval: (+0.15) d=23 shredder 12

After <18.e4> here is the line given:

18...Be7 19.e5 c5 20.bxc5 Bc6 21.cxb6 Nxb6 22.Qd3 Ba4 23.Re1 dxc4 24.Nxc4 Bb5 25.Nfd2 Bg5 26.f4 Be7 27.a3 Bc5 28.Kh1 Bxd4

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The World - Pogonina,N, The Chessgames Challenge

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Analysis by Fritz 11: d=24

1. (0.16): 21.a3 Qc7 22.Ra1 Ra8 23.Bf1 Êh8 24.a4 bxa4 25.Qxa4 axb4 26.Qxb4 Reb8 27.Qc3 Êg8 28.Bd3 Qc8 29.Nf1 Ba6 30.Ne3 Bxd3

2. (0.09): 21.a4 bxa4 22.Qxa4 axb4 23.Qxb4 Ba6 24.Ra1 Ra8 25.Bf1 Bxf1 26.Rxf1 Qc7 27.Rfe1 Reb8 28.Qc3 Nf8 29.Rxa8 Rxa8 30.Rb1 Rb8 31.Rxb8 Qxb8 32.Êg2 Ng6 33.Ne1

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1) 18.e3 b5 19.cxb5 cxb5 20.Qd3 Bc6 21.Nb3 Nb6 22.Ne5 Nc4 23.Nxc6 Rxc6 24.Qc2 Be7 0.03

2) 18.h3 h5 19.Qe3 Qe7 20.Ne5 Nxe5 21.dxe5 Bg7 22.Nf3 f6 0.01

3) 18.Nf1 g4 19.Ne1 b5 20.cxb5 cxb5 21.Rxc8 Qxc8 22.Ne3 h5 23.h3 gxh3 24.Bxh3 Qc6 25.N1g2 -0.03

4) 18.cxd5 cxd5 19.h3 Qe7 20.Nf1 h5 21.Ne3 Qd6 22.a3 Be7 23.Qb2 Ba6 24.Qd2 Bb5 -0.15

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Analysis by Houdini 1.03a x64 4_CPU (26-ply):

1. = (0.11): 18...Be7 19.exd5 cxd5 20.c5 Ba8 21.Bf1 a5 22.a3 bxc5 23.dxc5 Qc7 24.Bb5 axb4 25.axb4 Red8 26.Ra1 Bf6 27.Ra6 Nf8 28.Qe3

2. = (0.14): 18...Rb8 19.e5 Be7 20.Ne1 a5 21.a3 Ra8 22.Nd3 Nf8 23.Ra1 axb4 24.axb4 Qd7 25.Qc3 Ba6 26.h4

3. = (0.16): 18...Ra8 19.exd5 cxd5 20.c5 Rc8 21.Qa4 a6 22.Nf1 Nb8 23.Ne3 h5 24.Rb1 Re7 25.Qb3 Nc6 26.a3 Rd7 27.Qd3 b5

4. = (0.19): 18...Nf8 19.Bf1 Nd7 20.Bd3 Be7 21.exd5 exd5 22.Re1 g6 23.a3 Bf6 24.Rxe8+ Qxe8 25.Re1 Qd8 26.Bf1 Qc7 27.Rc1 Qd8 28.Qe3 Bg7 29.Bh3

5. = (0.23): 18...Rc7 19.e5 Be7 20.Ne1 Nf8 21.Nd3 Qd7 22.h4 Rcc8 23.a4 Red8 24.Rb1 Rb8 25.Qc2 Rdc8

6. = (0.23): 18...h5 19.h4 Be7 20.a3 Ba8 21.Ne1 Nf6 22.e5 Ng4 23.Nd3 Qd7 24.Nf4 g6 25.Bf3 Nh6 26.Nf1 Nf5

7. = (0.24): 18...g5 19.e5 Bg7 20.h4 g4 21.Ne1 f6 22.b5 fxe5 23.bxc6 Rxc6 24.cxd5 Rxc1 25.Rxc1 Bxd5 26.Bxd5 exd5 27.Qxd5+ Kh7 28.Qe4+ Kh8 29.Qxg4 exd4 30.Nd3 Ne5 31.Nxe5 Bxe5 32.Qg6 Bg7 33.Ne4

8. = (0.25): 18...Ba8 19.e5 Be7 20.Ne1 Nf8 21.Nd3 Qd7 22.h4 Red8 23.c5 Bb7 24.Nf4 bxc5 25.bxc5 Ba6 26.Rb1 Rb8

9. = (0.25): 18...Rf8 19.e5 Be7 20.Ne1 Nb8 21.Nd3 Qd7 22.a4 Rfd8 23.Qb1 Ba6 24.c5 bxc5 25.Nxc5 Bxc5 26.bxc5 Be2 27.Re1 Bg4 28.Bf1

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Analysis by Houdini 1.03a x64 4_CPU (24-ply):

1. = (0.15): 19.e5 Ra8 20.Ne1 a5 21.b5 a4 22.Qb2 c5 23.cxd5 exd5 24.dxc5 a3 25.Qc2 bxc5 26.Nc4 Nb6 27.Nxb6 Qxb6 28.Rxd5 Ra5 29.Rd7 Bxg2 30.Nxg2 Rxb5 31.Ne3

2. = (0.13): 19.exd5 cxd5 20.c5 Ba8 21.Bf1 a5 22.a3 bxc5 23.dxc5 Qc7 24.Bb5 axb4 25.axb4 Red8 26.Ra1 Rb8 27.Nd4 Ne5 28.f4

3. = (0.12): 19.Ne5 Nxe5 20.dxe5 Qd7 21.cxd5 cxd5 22.Rxc8 Rxc8 23.exd5 Bxd5 24.Nf1 Rd8 25.Bxd5 exd5 26.Rd4 Qc7 27.Rxd5 Rxd5 28.Qxd5 Bxb4 29.Kg2 Qc3 30.Ne3 Qc8 31.Nc4 Qf5 32.Nb2

4. = (0.11): 19.a3 dxe4 20.Nxe4 c5 21.Nc3 cxd4 22.Rxd4 Bf6 23.Rdd1 Bc6 24.Nd2 Bxc3 25.Rxc3 Qc7 26.Ne4 Bxe4 27.Bxe4 Red8 28.Bg2 Nf6 29.c5 Rxd1+ 30.Qxd1 Rd8 31.Qe2 bxc5

5. = (0.11): 19.c5 Bf6 20.e5 Be7 21.Bf1 Qc7 22.Rb1 Rb8 23.Qc3 a5 24.a3 Red8 25.Qc2 Rdc8 26.Ra1 Ra8 27.Rdb1 axb4

17...Re8 18.e4 Be7 19.c5

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Shredder 12 prefers 19.e5 here, but the resulting open positions look very good for black's bishop pair. I posted this analysis previously.

I forced 19.c5 at <ajile>'s suggestion.

19...Ra8 (+0.36) d=24

<Other black options: 19...Qc7, 19...Rb8>

20.Bh3

<Other white options: 20.e5, 20.a3>

20...a5 21.exd5 exd5 22.bxa5 Rxa5 23.a4 b5 24.axb5 Rxb5 25.Qc2 Qc7 26.Re1 Bc8 27.Ra1 (+0.32) d=24

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To my eye this looks like a tough position to win because the pawns are so static. Here's a run out line by Shredder 12:

27...Nf8 28.Bf1 Rb4 29.Qc3 Rb7 30.Bd3 Bh3 31.Bc2 Nd7 32.Nb3 Rb5 33.Ra6 Qb7 34.Ra4 Bg4 35.Kg2 Qc8 36.Qe3 Bh5

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A.)<18.e3>
B.)<18.a4>
C.)<18.a3>
D.)<18.Ne1>

<17...Be7>

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A.)[ 18.e3 Re8 19.a3

<(19.a4 Ba8 20.Ne1 e5 21.dxe5 Nxe5 22.b5 cxb5 23.axb5 - Transposition possible with 18.a4 line [+0.11])>

19...Ra8 20.Ne1 a5 21.Nd3 axb4 22.axb4 Qb8 23.Qb2 Rd8 24.Rb1 Qc7 25.Rdc1 Qd6 26.Ra1 Bf6 27.Qc2

<(27.Rxa8 Rxa8 28.Ra1 Qb8 29.Ra3 [+0.04])>

27...Rxa1 28.Rxa1 e5 29.c5 Qc7 30.Nb3 bxc5 31.bxc5 Re8 [+0.11] ]

*****

B.)[ 18.a4 Re8 19.e3 Ba8 20.Ne1 e5 21.Nd3

<(21...exd4 22.exd4 Nf8 23.cxd5 cxd5 [+0.04])>

21.dxe5 Nxe5 22.b5 cxb5 23.axb5 [+0.11] - Transposition possible with 18.e3 line. ]

*****

C.)[ 18.a3 Ra8 19.e4 a5 20.exd5

<(20.e5 axb4 21.axb4 Ra7 22.cxd5 cxd5 23.Bf1 Qa8 24.Rc7 Qd8 [+0.00])>

20...cxd5 21.c5 axb4 22.c6 Nc5 23.dxc5 [+0.07] ]

*****

D.)[ 18.Ne1 b5

<(18...Bf6 19.Nef3 Re8 20.e4 Be7 21.e5 Bf8 22.a3 Qe7 23.Ne1 [+0.22])>

19.c5 a5 20.a3 Bf6

<( 20...Ra8 21.Nd3 axb4 22.axb4 Qc7 23.Qb2 Ra4 24.Ra1 Rfa8 25.Rxa4 Rxa4 26.Ra1 Bf6 27.e4 [+0.18] )>

21.Nef3 Ra8 22.Qc3 g5 23.e4 axb4 24.axb4 Bg7 25.Ra1 [+0.18] ]

Sliding slowly forward with d= 25 or d higher than 25 with fritz 11.

17. Qb3 <b5> 18. c5 a5 19. a3 Ra8 20. e4 Qc7 21. e5 Be7 22. Ra1 Ra7 23. Qc3 Rfa8

The position is evaluated with +0,11

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Analysis by Houdini 1.03a x64 4_CPU (26-ply):

1. = (0.12): 19...c5 20.bxc5 Bc6 21.cxb6 Nxb6 22.c5 Ba4 23.Qb4 Bxd1 24.Rxd1 Rb8 25.Qa5 Nc8 26.Qa6 Qc7 27.Bf1 Bd8 28.Bb5 Rf8 29.Nb3 Ne7 30.Rb1 Qb7 31.Qxb7 Rxb7 32.a4 Bc7

2. = (0.14): 19...Nb8 20.Ne1 Na6 21.a3 dxc4 22.Nxc4 Qd7 23.Be4 Nc7 24.h4 Nd5 25.Bb1 h5 26.Nf3 Ba6 27.Ng5 Bxc4 28.Qxc4

3. = (0.15): 19...Nf8 20.Ne1 Qd7 21.Nd3 Ng6 22.a4 Bg5 23.c5 Bxd2 24.Rxd2 Ba6 25.Qc3 Ne7 26.Bf3 Bc4 27.cxb6 axb6 28.Nb2 Bb5

4. = (0.17): 19...Rb8 20.Ne1 Nf8 21.Qc3 Ra8 22.Qb2 Qd7 23.Nd3 Rec8 24.a4 Rab8 25.Qc2 Ba6 26.Qc3 Bg5 27.f4 Be7 28.Qb2 Ng6 29.Qc3

5. = (0.21): 19...Rc7 20.Ne1 Qb8 21.Nd3 Rec8 22.a3 Qa8 23.h4 a5 24.Qb2 Qa7 25.Nf4 Qa8 26.Ra1 Qa7 27.Re1

6. = (0.22): 19...Ra8 20.Ne1 Nf8 21.Rb1 Qc7 22.Nd3 Red8 23.a4 Rac8 24.c5 Nd7 25.Qc3 Re8 26.Rdc1 Rb8 27.Bf1

7. = (0.22): 19...Ba8 20.Ne1 a5 21.a3 Rb8 22.h4 Bf8 23.Nc2 Rc8 24.bxa5 bxa5 25.c5 Rb8 26.Qd3 Qc7 27.Re1 Be7 28.Rb1

8. = (0.22): 19...a6 20.Ne1 Rb8 21.a4 a5 22.b5 Nf8 23.c5 Rc8 24.Nd3 Nd7 25.Qa3 bxc5 26.dxc5 Qb6 27.cxb6 Bxa3 28.Ra1 Be7 29.Nb3 cxb5 30.axb5 Ba8 31.Rxa5

9. = (0.24): 19...h5 20.h4 Ra8 21.Ne1 a5 22.a3 Nf8 23.Bf3 axb4 24.axb4 g6 25.Nd3 Qd7 26.Bg2 Rec8 27.Qc3 Ra2 28.c5

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Analysis by Houdini 1.03a x64 4_CPU (24-ply):

1. = (0.05): 19...Rb8 20.Bh3 Nf6 21.e5 Nd7 22.Bf1 a5 23.a3 Ra8 24.Qc2 Qc7 25.Ra1 Ra7 26.Nb3 axb4 27.axb4 Rea8 28.Rxa7

2. = (0.09): 19...Ba8 20.a3 Rb8 21.Qc3 a5 22.e5 Bb7 23.Rb1 Qc7 24.Bf1 axb4 25.axb4 Ra8 26.Ra1 Rec8 27.Bd3 Rcb8 28.Qc2

3. = (0.10): 19...h5 20.exd5 exd5 21.Bh3 Rc7 22.Re1 bxc5 23.bxc5 Bc8 24.Qe3 Nf8 25.Bxc8 Rxc8 26.Qc3 Bf6 27.Rxe8 Qxe8 28.Re1 Ne6 29.Ne5 Rb8 30.Ndf3

4. = (0.14): 19...Qc7 20.Bh3 bxc5 21.bxc5 Rb8 22.Qa4 Ba8 23.e5 Rb7 24.Rb1 Reb8 25.Rxb7 Bxb7 26.Rb1 Bc8 27.Rxb8 Nxb8 28.Bf1 a5 29.Nb3

5. = (0.14): 19...Bf6 20.Re1 Qc7 21.Bh3 Rb8 22.Qa4 h5 23.Bf1 g5 24.Nb3 g4 25.Nfd2 Be7 26.Ba6 Bxa6 27.Qxa6 bxc5

6. = (0.15): 19...Ba6 20.Re1 bxc5 21.bxc5 Rb8 22.Qc2 Qa5 23.Re3 dxe4 24.Nxe4 Rb4 25.Qd2 Reb8 26.a3 Ra4 27.Qxa5 Rxa5 28.Nd6 Rb2 29.Ne5 Nxe5 30.dxe5 Bb5 31.Rec3

7. = (0.15): 19...Nf8 20.Ne5 Bf6 21.Qa3 bxc5 22.bxc5 Bxe5 23.dxe5 Qc7 24.Rb1 a5 25.f4 Ba6 26.Nb3 Nd7 27.Nd4 Bc4 28.exd5

8. = (0.15): 19...Ra8 20.Bh3 Nf6 21.exd5 exd5 22.Ne5 Qc7 23.Rb1 Rab8 24.Qc3 Ba6 25.Re1 bxc5 26.bxc5 Rxb1 27.Rxb1 Bf8 28.f4

9. = (0.16): 19...bxc5 20.bxc5 Ba6 21.Bf1 Bxf1 22.Rxf1 Bg5 23.Qa4 Bxd2 24.Nxd2 Qc7 25.e5 Rb8 26.Rb1 a5 27.Qa3 Qa7 28.Qd3 a4

17...Re8 18.e4 Be7 19.c5 Ra8 20.e5 a5 21.a3

(+0.04) d=25 21...Qc7
(+0.04) d=25 21...Ra7

All roads lead by transposition to this position:

21...Qc7 22.Re1 Ra7 23.Qc3 Ba6 24.Ra1 Rea8 25.Nb3 Qb7 26.Nfd2 Bb5 27.f4 Bd8 28.Reb1 f5 29.exf6 e.p. axb4 30.axb4 Bxf6

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Analysis by Houdini 1.03a x64 4_CPU (26/27-ply):

1. = (0.16): 18...Qe7 19.Ne1 Qd6 20.Nd3 Red8 21.Qa4 Qb8 22.cxd5 cxd5 23.b5 Be7 24.Nb4 Bxb4 25.Qxb4 a5 26.Qe7 Nf6 27.Nf3 Rd7 28.Qa3

2. = (0.18): 18...a6 19.a3 Rb8 20.Ne1 Qe7 21.Nc2 Rec8 22.e4 dxe4 23.c5 Bg5 24.Bxe4 Bxd2 25.Rxd2 a5 26.cxb6 axb4 27.Nxb4 Nxb6 28.Nxc6 Qd7 29.Rdc2 Bxc6 30.Bxc6 Qxd4 31.a4 Rd8 32.a5 Nd5 33.Qc4

3. = (0.20): 18...Ra8 19.Ne1 b5 20.cxb5 cxb5 21.Bf1 a6 22.a4 Qb6 23.Nd3 Rec8 24.Qa2 Be7 25.a5 Qd8 26.Nb3 Rxc1 27.Rxc1 Rc8

==

4. = (0.18): 18...Rc7 19.Ne1 Be7 20.Nd3 Qb8 21.a4 Rec8 22.Re1 h5 23.e4 dxe4 24.Bxe4 Rd8 25.c5 h4 26.Qc3 Rcc8 27.Nc4

5. = (0.18): 18...Nf8 19.Ne1 Qd6 20.Nd3 Nd7 21.Rc2 Rc7 22.Rdc1 Rec8 23.Qc3 Ba6 24.Qa3 Bb7 25.cxd5 exd5 26.Qa4 a6 27.Qb3

6. = (0.19): 18...Be7 19.Ne1 h5 20.h4 Nf6 21.Nd3 Ng4 22.Nf4 g6 23.b5 dxc4 24.Nxc4 cxb5 25.Qxb5 Qc7 26.Ne5 Qxc1 27.Qxe8+ Rxe8 28.Rxc1 Bxg2 29.Kxg2 Nxe5 30.dxe5 Bc5 31.Nd3 Bf8

7. = (0.20): 18...Qc7 19.cxd5 exd5 20.Ne1 Qd6 21.a4 Nf8 22.Nd3 Ne6 23.Nf3 Rc7 24.Rd2 Rec8 25.h4 Ba6 26.Nfe5 Bxe5 27.Nxe5

8. = (0.20): 18...h5 19.Ne1 Be7 20.h4 Nf6 21.Nd3 Ng4 22.Nf4 g6 23.b5 dxc4 24.Nxc4 cxb5 25.Qxb5 Qc7 26.Ne5 Qxc1 27.Qxe8+ Rxe8 28.Rxc1 Bxg2 29.Kxg2 Nxe5 30.dxe5 Bc5 31.Nd3 Bf8

9. = (0.22): 18...Ba8 19.cxd5 cxd5 20.Qa4 Rc7 21.Bf1 Re7 22.Rxc7 Qxc7 23.Qa3 Nf8 24.Rc1 Qd7 25.h4 Re8 26.Qa6 Re7 27.Qc8

Scores given as absolute numerical values from whites perspective.

1.(-0.14) 18....Ra8 19.e4 a5 20.e5 Be7 21.a3 Qc7 22.Ra1 Ra7 23.Rdc1 Ba6 24.cxb6 Nxb6 25.bxa5 Nc4 26.Nxc4 Bxc4 27.Qb6 Qd7

Method: Sliding forward and backward with d > 25 (sometimes up to 30), deep fritz 11

17. Qb3 < b5>
An ugly, unpositional move, making Bb7 to a big pawn for the rest of the game. The only question is, if Black can organize counter-play on the a-file or not. This could compensate the obvious bad Bb7

18. c5 a5 19. a3 Ra8 (first rook on a file)

20. e4 Qc7 21. e5 Be7 22. Ra1
(22. Qc3 (thanks <whiteshark> for posting your analyze in my forum; here a modification) axb4 (22...Ra6 23. Nb3 24. axb4 24. axb4 Rfa8 25. Ra1; +0,20) 23. axb4 Ra4 24. Nb3 Rfa8 25. Na5 Nb8 26. Bf1 Na6 27. Ra1 Bd8: +0,30 (27...Nxb4 28. Rxa4 bxa4 29. Nxb7 Qxb7 30. Rb1; +0,5))

22...Ra7 23. Qc3! Rfa8 (second rook on the a-file)

24. Nb3! Key move. Forcing black to close the queen side and loosing all counterplay or open the a-file too early.

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24...axb4 25. axb5 Rxa1
(25...Ra4 26. Na5! (Key move to close the a file) 26...Rxa1 27. Rxa1 and white is more than fine)

26. Rxa1 Rxa1+
(26...Ra4 Na5!)

27. Qxa1 Bd8 28. Bf1 Bc8 29. Bd3 Nf8 30. Kg2 Qd7 31. h4 (only 0,30)

Black is completely helpless, no couter-play at all. I would not lose this position against Carlsen OTP.

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Analysis by Houdini 1.03a x64 4_CPU (25-ply):

1. = (0.17): 19.Ne1 a6 20.Nd3 Rb8 21.Rc2 Qd6 22.a4 Red8 23.Nf4 Bg5 24.Rdc1 Bxf4 25.exf4 Nf6 26.c5 bxc5 27.bxc5 Qe7 28.Rb1

2. = (0.14): 19.a4 Rb8 20.Ne1 Red8 21.Nd3 a6 22.b5 axb5 23.axb5 c5 24.cxd5 exd5 25.Bxd5 Bxd5 26.Qxd5 cxd4 27.Qf3 dxe3 28.Qxe3 Qxe3

3. = (0.12): 19.Rc2 Rb8 20.e4 dxe4 21.Nxe4 c5 22.Nxf6+ Nxf6 23.dxc5 bxc5 24.b5 e5 25.Rcd2 e4 26.Ne1 Rbd8 27.Nc2 Rxd2 28.Rxd2 Ng4 29.Ne3 Ne5 30.Qa3 Ba8

4. = (0.09): 19.a3 Red8 20.Ne1 Qd6 21.Nd3 Qb8 22.Re1 Qa8 23.c5 Ba6 24.Bf1 Qb7 25.a4 Bxd3 26.Qxd3 e5

5. = (0.07): 19.e4 g5 20.Re1 Rb8 21.h3 Bg7 22.cxd5 cxd5 23.e5 Bf8 24.Qa4 a6 25.a3 Rbc8 26.Qb3

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Analysis by Houdini 1.03a x64 4_CPU (25-ply):

1. = (0.18): 19.Ne1 b5 20.c5 a5 21.f4 axb4 22.Nd3 Ra8 23.Nxb4 Ra4 24.Nb1 Qa5 25.a3 Nb8 26.Nd3 Qa7 27.Rd2 Nd7 28.Nb4 Be7

2. = (0.17): 19.a3 Rb8 20.e4 a5 21.e5 Be7 22.Ne1 Ra8 23.Nd3 axb4 24.axb4 Nf8 25.Qc3 Qd7 26.Ra1 Reb8 27.Rdb1

3. = (0.12): 19.a4 Be7 20.Ra1 Ba8 21.a5 bxa5 22.Rxa5 Rb8 23.Rxa6 Rxb4 24.Qa2 Rb8 25.Ne1 Bb7 26.Ra7 Ra8 27.Rb1 Qb8 28.Rxa8 Qxa8 29.Qxa8 Bxa8 30.Nd3 Rb8 31.Rxb8+

4. = (0.11): 19.e4 Ra8 20.e5 Be7 21.Ne1 a5 22.b5 c5 23.Nd3 a4 24.Qb2 Rc8 25.cxd5 Bxd5 26.Bxd5 exd5 27.Nb1 c4 28.Nb4 Bxb4 29.Qxb4 Nf8 30.Nc3 Ne6 31.f4 Qd7 32.Nxa4 Rb8 33.Qd6 Qxd6 34.exd6 Red8

5. = (0.07): 19.c5 Ra8 20.Bf1 Be7 21.Qa4 Qc7 22.cxb6 Qxb6 23.Rc2 a5 24.b5 Rec8 25.Rdc1 c5 26.dxc5 Rxc5 27.Rxc5 Bxc5 28.Qf4 Bd6

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Analysis by Houdini 1.03a x64 4_CPU (25-ply):

1. = (0.18): 19.Ne1 b5 20.cxb5 cxb5 21.Bf1 a6 22.a4 bxa4 23.Qxa4 a5 24.Qb5 Ba6 25.Qxa5 Qxa5 26.bxa5 Bxf1 27.Kxf1 Rxa5 28.Ra1 Rea8 29.Rxa5 Rxa5 30.Rc1 Kf8 31.Rc7 Ke8 32.Rb7

2. = (0.06): 19.a3 a5 20.Ne1 axb4 21.axb4 Be7 22.Nd3 Qb8 23.Ra1 Qd6 24.Qb2 Red8 25.e4 dxe4 26.Nxe4 Qc7 27.Rxa8 Rxa8 28.Ra1 Rxa1+ 29.Qxa1 Qc8

3. = (0.06): 19.Qb1 Rb8 20.Ne1 Qe7 21.Nd3 Rec8 22.Qb3 a5 23.b5 c5 24.cxd5 exd5 25.dxc5 Nxc5 26.Qa3 Nxd3 27.Qxd3 Rxc1 28.Rxc1 Qd7 29.Nb3 Be5

4. = (0.06): 19.Nb1 a5 20.cxd5 cxd5 21.bxa5 Ba6 22.Bf1 Bxf1 23.Rxf1 Rxa5 24.Rc2 Qa8 25.Nc3 Qa6 26.a4 Rd8 27.Qa3 Qd3 28.Rfc1 Qf5 29.Ne1 Re8

5. = (0.04): 19.Qb2 Be7 20.e4 a5 21.exd5 cxd5 22.c5 bxc5 23.bxc5 Bc6 24.Nf1 Rb8 25.Qc3 Qc7 26.Ne3 Ba4 27.Re1 Rb4 28.Nd2

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Analysis by Houdini 1.03a x64 4_CPU (25-ply):

1. = (0.15): 19.Ne1 Qb8 20.Nd3 Be7 21.Rc2 Rcc8 22.Rdc1 Qa8 23.a3 a5 24.cxd5 cxd5 25.Rc7 a4 26.Qb2 Rxc7 27.Rxc7 Nf6 28.Nf3

2. = (0.12): 19.e4 Be7 20.c5 Rc8 21.exd5 exd5 22.Bh3 bxc5 23.bxc5 Rc7 24.Re1 Bc8 25.Kg2 Nf8 26.Bxc8 Qxc8 27.Rb1 Ne6 28.Qd3 Bf6 29.Nf1 Rce7 30.Ne3

3. = (0.06): 19.c5 Rc8 20.e4 Rb8 21.Re1 Be7 22.Bf1 a5 23.a3 dxe4 24.Nxe4 axb4 25.axb4 Nf6 26.Qd3 bxc5 27.Nxc5 Ba8 28.Rb1 Nd5

4. = (0.00): 19.Rc2 c5 20.Rdc1 Qa8 21.bxc5 bxc5 22.cxd5 Bxd5 23.Qd3 Rd8 24.Qf1 Rdc8 25.Ne1 Bd8 26.Bxd5 Qxd5 27.Qc4 Qb7 28.Qa4 Qd5 29.Qc4 Qb7

5. = (0.00): 19.Qb1 Qb8 20.a3 c5 21.bxc5 bxc5 22.dxc5 Rxc5 23.Nd4 Rec8 24.cxd5 exd5 25.Bh3 Rxc1 26.Rxc1 Rxc1+ 27.Qxc1 Qd8 28.Qc2 Nb6 29.a4 Be7

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Analysis by Houdini 1.03a x64 4_CPU (25-ply):

1. = (0.15): 19.Ne1 e5 20.dxe5 Nxe5 21.a3 Bf6 22.cxd5 cxd5 23.Ne4 dxe4 24.Rxd8 Rexd8 25.Rxc8 Rxc8 26.Qb1 Rc4 27.Qd1 Rc3 28.a4 g6 29.Qb1 Rc4 30.a5 Kg7 31.a6 Bd5 32.h4

2. = (0.11): 19.a4 Rc7 20.Ne1 a5 21.bxa5 bxa5 22.e4 e5 23.dxe5 d4 24.Nd3 Bf8 25.f4 Ba6 26.Rb1 Rb7 27.Qc2 Bb4 28.Bh3 c5 29.Nb3

3. = (0.10): 19.a3 Ra8 20.Ne1 a5 21.Nd3 axb4 22.axb4 Qb8 23.e4 dxe4 24.Nxe4 Rc8 25.Ra1 Rd8 26.Qc3 Qc7 27.c5 Ba6 28.Ne5 Nxe5

4. = (0.07): 19.Ne5 b5 20.cxd5 cxd5 21.Nxd7 Qxd7 22.Qa3 a5 23.Qxa5 Ra8 24.Qc7 Bc8 25.Nf3 f6 26.Bf1 Bxb4 27.Qb6 Rxa2 28.Bxb5 Qd8 29.Qc6 Rf8 30.Ra1 Qa5 31.Rxa2 Qxa2 32.Rc1 Ba3

5. = (0.06): 19.h4 Ra8 20.b5 cxb5 21.Qxb5 Rc8 22.cxd5 a6 23.Qb1 exd5 24.Rxc8 Bxc8 25.Qb3 Bb7 26.Ne1 Nf6 27.Nd3 b5 28.Nc5

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Analysis by Houdini 1.03a x64 4_CPU (25-ply):

1. = (0.17): 19.cxd5 exd5 20.Ne1 Qd6 21.a4 h5 22.Nd3 h4 23.Nf3 hxg3 24.hxg3 Rc7 25.Bh3 Be7 26.Rc2 Nf6 27.Nfe5 Ne4 28.Bg2 Ng5

2. = (0.11): 19.Ne1 Qb8 20.b5 dxc4 21.Nxc4 cxb5 22.Qxb5 Bxg2 23.Kxg2 Rc7 24.f3 Be7 25.Rc2 Qa8 26.Qb3 Rec8 27.Rdc1 Qd5 28.Nd3 a6 29.Na3

3. = (0.09): 19.e4 dxe4 20.Nxe4 c5 21.Nxf6+ Nxf6 22.dxc5 bxc5 23.b5 e5 24.Nh4 Bxg2 25.Nxg2 Red8 26.Ne3 g6 27.Rxd8+ Rxd8 28.Nd5 Nxd5 29.cxd5 e4 30.Kg2 Qd6 31.Rd1 Qe5

4. = (0.06): 19.Rb1 Be7 20.Rdc1 c5 21.bxc5 dxc4 22.Nxc4 Be4 23.c6 Qxc6 24.Nfe5 Nxe5 25.Bxe4 Qxe4 26.Nxe5 Bf6 27.Nc4 Red8 28.Qb5 Rc7 29.Nd2 Qb7 30.a4 e5 31.dxe5 Bxe5 32.Qxe5

5. = (0.00): 19.Bf1 dxc4 20.Bxc4 c5 21.e4 Red8 22.bxc5 bxc5 23.e5 Bg5 24.Nxg5 hxg5 25.Bxe6 fxe6 26.Qxe6+ Kh8 27.Qh3+ Kg8 28.Qe6+ Kh8