Hard talkchess 2016 beta 1

[Eelco de Groot]

Any update?

At least, yes !
Here are some conclusions. Still some doubt about some positions, if you have the main line, please post it :

Code: Select all

Bad or I'm not able to see the winning line : 2r1k2r/4qpp1/p3p2p/1pn1P3/3N2P1/P7/1PP3QP/1K1R2R1 w k - id ?; bm Nf5;

In the age of AlphaGo the first thing we try is of course Google pattern matching. The solution immediately appears from a Russian server exf6 is strangely hard to find for Stockfish
only after making the move it sees something. Not a clear win though.
Here the reborn Tommy Cooper engine gets something like this in Multi PV. But the score is compensation for the invested material, that there is compensation is clear.

[pgn]
[Event "?"]
[Site "?"]
[Date "2016.04.29"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "2r1k2r/4qpp1/p3p2p/1pn1P3/3N2P1/P7/1PP3QP/1K1R2R1 w k -"]

1. Nf5 exf5 2. gxf5 f6 3. exf6 Qxf6 4. Qd5 Kf8 5. Rg6 Qf7
6. Qd6+ Kg8 7. Rdg1 Rh7 8. f6 Ne6 9. Qxa6 Qd7 10. Qb6 *[/pgn]


[D]2r3k1/3q2pr/1Q2nPRp/1p6/8/P7/1PP4P/1K4R1 b - -

Engine: eXperimental Tommy Cooper 20162803_030 MP (512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott

30 35:04 +0.67 10...Kf7 11.fxg7 Rxg7 12.Rxg7+ Nxg7
13.Qxh6 Qd4 14.Qg6+ Kf8 15.c3 Qe5
16.Rg5 Rc6 17.Rxe5 Rxg6 18.Rxb5 Ra6
19.Ka2 Rh6 20.b4 Rxh2+ 21.Kb3 Rh1
22.a4 Ne6 23.Rb6 Ke7 (9.000.511.693) 4275

30 35:04 +0.68 10...Qd5 11.fxg7 Nxg7 12.Qf6 Rc7
13.b3 Rf7 14.Qc3 Qd7 15.Rc6 Rh8
16.Rgg6 Qf5 17.h4 Kh7 18.Rxh6+ Kg8
19.Rc8+ Rf8 20.Rhc6 Rxc8 21.Rxc8+ Kh7
22.Rc7 Rg8 23.Kb2 Qf4 (9.000.511.693) 4275

30 35:04 +0.70 10...Re8 11.h4 h5 12.Qe3 Rc8 13.fxg7 Nxg7
14.Rf1 Kh8 15.Qc5 Kg8 16.Qf2 Qd5
17.Qf6 Qc4 18.Rg2 Re8 19.Qf5 Rd8
20.b3 Qd5 21.Qf6 Re8 22.Rgf2 Kh8
23.Rf5 Qe6 (9.000.511.693) 4275

30 35:04 +0.74 10...h5 11.Qe3 Re8 12.h4 Qf7 13.Qb3 Rf8
14.Qxb5 Nc7 15.Qe5 Ne8 16.fxg7 Rxg7
17.Qxh5 Rxg6 18.Rxg6+ Ng7 19.b3 Ra8
20.Qc5 Qxg6 21.Qd5+ Ne6 22.Qxa8+ Kg7
23.a4 Qg4 (9.000.511.693) 4275

30 35:04 +0.79 10...Ng5 11.h4 Ne6 12.fxg7 Nxg7
13.Rf1 h5 14.Qf6 Rd8 15.Qf4 Qd5
16.Rf6 Rh8 17.Qc7 Re8 18.Rg1 Rh7
19.Rfg6 Qf7 20.Qc5 Qd7 21.Rd6 Qb7
22.Rf6 Qd7 23.Rgf1 Ne6 (9.000.511.693) 4275

30 35:04 +0.82 10...Qc6 11.f7+ Kxf7 12.Qf2+ Kg8
13.Qe2 Re8 14.Re1 h5 15.Rxe6 Qxe6
16.Qxe6+ Rxe6 17.Rxe6 g5 18.Rg6+ Rg7
19.Rxg7+ Kxg7 20.Kc1 Kf6 21.Kd2 g4
22.Ke3 Ke5 23.b3 h4 (9.000.511.693) 4275

29 35:04 +1.32 10...Qf7 11.Qxb5 Ng5 12.Qf5 Rc6
13.h4 Rxf6 14.Rxf6 gxf6 15.hxg5 fxg5
16.Qc8+ Qf8 17.Qe6+ Qf7 18.Qd6 Qe7
19.Qg6+ Qg7 20.Qd3 Qd7 21.Qc4+ Qf7
22.Qc6 Qd7 23.Qa8+ Kg7 (9.000.511.693) 4275

best move: Kg8-f7 time: 36:20.485 min n/s: 4.275.927 nodes: 9.334.411.628

[Vinvin]

Any update?

At least, yes !
Here are some conclusions. Still some doubt about some positions, if you have the main line, please post it :

Code: Select all

Bad or I'm not able to see the winning line : 2r1k2r/4qpp1/p3p2p/1pn1P3/3N2P1/P7/1PP3QP/1K1R2R1 w k - id ?; bm Nf5;

In the age of AlphaGo the first thing we try is of course Google pattern matching. The solution immediately appears from a Russian server exf6 is strangely hard to find for Stockfish
only after making the move it sees something. Not a clear win though.
Here the reborn Tommy Cooper engine gets something like this in Multi PV. But the score is compensation for the invested material, that there is compensation is clear.

[Event "?"]
[Site "?"]
[Date "2016.04.29"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "2r1k2r/4qpp1/p3p2p/1pn1P3/3N2P1/P7/1PP3QP/1K1R2R1 w k -"]

1. Nf5 exf5 2. gxf5 f6 3. exf6 Qxf6 4. Qd5 Kf8 5. Rg6 Qf7
6. Qd6+ Kg8 7. Rdg1 Rh7 8. f6 Ne6 9. Qxa6 Qd7 10. Qb6 *

2r3k1/3q2pr/1Q2nPRp/1p6/8/P7/1PP4P/1K4R1 b - -
...

After 1. Nf5 exf5 2. gxf5, Stockfish chose 2...Rg8 instead of 2...f6?.

[Eelco de Groot]

Any update?

At least, yes !
Here are some conclusions. Still some doubt about some positions, if you have the main line, please post it :

Code: Select all

Bad or I'm not able to see the winning line : 2r1k2r/4qpp1/p3p2p/1pn1P3/3N2P1/P7/1PP3QP/1K1R2R1 w k - id ?; bm Nf5;

In the age of AlphaGo the first thing we try is of course Google pattern matching. The solution immediately appears from a Russian server exf6 is strangely hard to find for Stockfish
only after making the move it sees something. Not a clear win though.
Here the reborn Tommy Cooper engine gets something like this in Multi PV. But the score is compensation for the invested material, that there is compensation is clear.

[Event "?"]
[Site "?"]
[Date "2016.04.29"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "2r1k2r/4qpp1/p3p2p/1pn1P3/3N2P1/P7/1PP3QP/1K1R2R1 w k -"]

1. Nf5 exf5 2. gxf5 f6 3. exf6 Qxf6 4. Qd5 Kf8 5. Rg6 Qf7
6. Qd6+ Kg8 7. Rdg1 Rh7 8. f6 Ne6 9. Qxa6 Qd7 10. Qb6 *

2r3k1/3q2pr/1Q2nPRp/1p6/8/P7/1PP4P/1K4R1 b - -
...

After 1. Nf5 exf5 2. gxf5, Stockfish chose 2...Rg8 instead of 2...f6?.

I did not look very deep, but Tommy Cooper had this then yesterday:

[D]2r1k2r/4qpp1/p6p/1pn1PP2/8/P7/1PP3QP/1K1R2R1 b k -

33 93:57 +0.35 2...f6 3.e6 O-O 4.b4 Nxe6 5.fxe6 Rfd8 6.Qg4 Rxd1+ 7.Rxd1 Rd8 8.Re1 Rf8 9.Qf5 Qd6 10.Qh5 Qe7 11.Qd5 f5 12.Qc6 f4 13.Qxa6 f3 14.Qc6 f2 15.Rf1 Qg5 (28.084.684.569) 4981
33 93:57 +0.56 2...Rg8 3.Rd5 g6 4.Rgd1 Qc7 5.Rd6 a5 6.Qd5 gxf5 7.e6 Nxe6 8.Rxe6+ Kf8 9.Re2 f4 10.Qf5 Rd8 11.Rf1 b4 12.axb4 axb4 13.Ref2 Rg7 14.Qxf4 Qxf4 15.Rxf4 Rd2 (28.084.684.569) 4981
33 93:57 +0.84 2...Qg5 3.Qf3 Qe7 4.Rd5 Nd7 5.Qg2 Nb6 6.Rdd1 Nc4 7.Qxg7 Rf8 8.Rge1 Qg5 9.Qf6 Nd2+ 10.Ka1 Rxc2 11.Qxa6 Qxf5 12.e6 fxe6 13.Qd6 Rc1+ 14.Rxc1 Nb3+ 15.Ka2 Nxc1+ (28.084.684.569) 4981
32 93:57 +1.74 2...Qh4 3.Qxg7 Rf8 4.e6 fxe6 5.fxe6 Qf6 6.Qg4 Ke7 7.Qb4 Ke8 8.e7 Qxe7 9.Rde1 Ne6 10.Qe4 Kd8 11.Rg6 Re8 12.Rxh6 Qd6 13.Rxe6 Qxe6 14.Qxe6 Rxe6 15.Rxe6 Kc7 (28.084.684.569) 4981
32 93:57 +1.82 2...Rf8 3.Qxg7 Qh4 4.e6 fxe6 5.fxe6 Qf6 6.Qg4 Ke7 7.Qb4 Ke8 8.e7 Qxe7 9.Rde1 Ne6 10.Qe4 Kd8 11.Rg6 Re8 12.Rxh6 Qd6 13.Rxe6 Qxe6 14.Qxe6 Rxe6 15.Rxe6 Kd7 (28.084.684.569) 4981
32 93:57 +2.73 2...g5 3.fxg6 fxg6 4.Qxg6+ Qf7 5.Qg2 Rf8 6.e6 Nxe6 7.Qd5 Rd8 8.Qc6+ Ke7 9.Qb7+ Ke8 10.Rxd8+ Nxd8 11.Re1+ Ne6 12.Qxa6 Kd8 13.b4 Qd7 14.Qxe6 Qxe6 15.Rxe6 Rf3 (28.084.684.569) 4981
32 93:57 +2.75 2...g6 3.fxg6 fxg6 4.Qxg6+ Qf7 5.Qg2 Rf8 6.e6 Nxe6 7.Qd5 Rd8 8.Qc6+ Ke7 9.Qb7+ Ke8 10.Rxd8+ Nxd8 11.Re1+ Ne6 12.Qxa6 Kd8 13.b4 Qd7 14.Qxe6 Qxe6 15.Rxe6 Rf3 (28.084.684.569) 4981
best move: f7-f6 time: 94:56.000 min n/s: 4.981.695 nodes: 28.325.788.158

But the analysis on Immortalchess got some more, I hope you can find it:

[pgn][Event "Анализ"]
[Site "?"]
[Date "2012.03.25"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "2r1k2r/4qpp1/p3p2p/1pn1P3/3N2P1/P7/1PP3QP/1K1R2R1 w k - 0 1"]
[PlyCount "35"]

1. Nf5 exf5 2. gxf5 f6 (2... Rg8 3. Rd5 $5 (3. e6 $6 fxe6 4. fxe6 g5 $5 (4...
g6 5. Rgf1 a5 6. Rde1 b4 7. Qg3 Nxe6 8. Rxe6 Qxe6 9. Re1 Kd7 10. Rxe6 Kxe6 11.
axb4 axb4 12. Qg4+ Kf7 13. Qxb4 $16) 5. Rge1 g4 $13) 3... g5 (3... Qc7 4. Re1
g6 5. Re3 Rd8 6. Rxd8+ Kxd8 7. Qa8+ $1 (7. Qd5+ Kc8 8. Rc3 Rd8 9. Qxc5 Qxc5 10.
Rxc5+ Kb7 $16) 7... Qc8 8. Qd5+ Ke8 9. f6 $18) 4. Qh3 Na4 5. Qxh6 Qc7 6. Rc1
Nb6 7. Rd4 Qc5 8. c3 Nc4 9. Qh7 Rf8 10. e6 Qe5 11. f6 Qxe6 12. Rcd1 Qxf6 13.
Re4+ Ne5 14. Qh3 $18) 3. exf6 Qxf6 4. Qd5 Kf8 5. Rg6 Qf7 6. Qd6+ Kg8 7. Rdg1
Rh7 8. f6 Ne6 9. Qxa6 Qd7 10. Qb6 Re8 11. h4 Kh8 12. Qf2 Rf8 (12... gxf6 13.
Qf5 Qd8 14. Rxf6 Ng7 15. Qf3 Qe7 16. Rf1 Rg8 17. Qc3 $18) 13. Qf5 Qf7 14. fxg7+
Nxg7 15. Qxb5 Nf5 16. a4 Rg7 17. Rxg7 Nxg7 18. Qc6 $16][/pgn]

[Vinvin]

Any update?

At least, yes !
Here are some conclusions. Still some doubt about some positions, if you have the main line, please post it :

Code: Select all

Bad or I'm not able to see the winning line : 2r1k2r/4qpp1/p3p2p/1pn1P3/3N2P1/P7/1PP3QP/1K1R2R1 w k - id ?; bm Nf5;

In the age of AlphaGo the first thing we try is of course Google pattern matching. The solution immediately appears from a Russian server exf6 is strangely hard to find for Stockfish
only after making the move it sees something. Not a clear win though.
Here the reborn Tommy Cooper engine gets something like this in Multi PV. But the score is compensation for the invested material, that there is compensation is clear.

[Event "?"]
[Site "?"]
[Date "2016.04.29"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "2r1k2r/4qpp1/p3p2p/1pn1P3/3N2P1/P7/1PP3QP/1K1R2R1 w k -"]

1. Nf5 exf5 2. gxf5 f6 3. exf6 Qxf6 4. Qd5 Kf8 5. Rg6 Qf7
6. Qd6+ Kg8 7. Rdg1 Rh7 8. f6 Ne6 9. Qxa6 Qd7 10. Qb6 *

2r3k1/3q2pr/1Q2nPRp/1p6/8/P7/1PP4P/1K4R1 b - -
...

After 1. Nf5 exf5 2. gxf5, Stockfish chose 2...Rg8 instead of 2...f6?.

I did not look very deep, but Tommy Cooper had this then yesterday:

[D]2r1k2r/4qpp1/p6p/1pn1PP2/8/P7/1PP3QP/1K1R2R1 b k -

33 93:57 +0.35 2...f6 3.e6 O-O 4.b4 Nxe6 5.fxe6 Rfd8 6.Qg4 Rxd1+ 7.Rxd1 Rd8 8.Re1 Rf8 9.Qf5 Qd6 10.Qh5 Qe7 11.Qd5 f5 12.Qc6 f4 13.Qxa6 f3 14.Qc6 f2 15.Rf1 Qg5 (28.084.684.569) 4981
33 93:57 +0.56 2...Rg8 3.Rd5 g6 4.Rgd1 Qc7 5.Rd6 a5 6.Qd5 gxf5 7.e6 Nxe6 8.Rxe6+ Kf8 9.Re2 f4 10.Qf5 Rd8 11.Rf1 b4 12.axb4 axb4 13.Ref2 Rg7 14.Qxf4 Qxf4 15.Rxf4 Rd2 (28.084.684.569) 4981
33 93:57 +0.84 2...Qg5 3.Qf3 Qe7 4.Rd5 Nd7 5.Qg2 Nb6 6.Rdd1 Nc4 7.Qxg7 Rf8 8.Rge1 Qg5 9.Qf6 Nd2+ 10.Ka1 Rxc2 11.Qxa6 Qxf5 12.e6 fxe6 13.Qd6 Rc1+ 14.Rxc1 Nb3+ 15.Ka2 Nxc1+ (28.084.684.569) 4981
32 93:57 +1.74 2...Qh4 3.Qxg7 Rf8 4.e6 fxe6 5.fxe6 Qf6 6.Qg4 Ke7 7.Qb4 Ke8 8.e7 Qxe7 9.Rde1 Ne6 10.Qe4 Kd8 11.Rg6 Re8 12.Rxh6 Qd6 13.Rxe6 Qxe6 14.Qxe6 Rxe6 15.Rxe6 Kc7 (28.084.684.569) 4981
32 93:57 +1.82 2...Rf8 3.Qxg7 Qh4 4.e6 fxe6 5.fxe6 Qf6 6.Qg4 Ke7 7.Qb4 Ke8 8.e7 Qxe7 9.Rde1 Ne6 10.Qe4 Kd8 11.Rg6 Re8 12.Rxh6 Qd6 13.Rxe6 Qxe6 14.Qxe6 Rxe6 15.Rxe6 Kd7 (28.084.684.569) 4981
32 93:57 +2.73 2...g5 3.fxg6 fxg6 4.Qxg6+ Qf7 5.Qg2 Rf8 6.e6 Nxe6 7.Qd5 Rd8 8.Qc6+ Ke7 9.Qb7+ Ke8 10.Rxd8+ Nxd8 11.Re1+ Ne6 12.Qxa6 Kd8 13.b4 Qd7 14.Qxe6 Qxe6 15.Rxe6 Rf3 (28.084.684.569) 4981
32 93:57 +2.75 2...g6 3.fxg6 fxg6 4.Qxg6+ Qf7 5.Qg2 Rf8 6.e6 Nxe6 7.Qd5 Rd8 8.Qc6+ Ke7 9.Qb7+ Ke8 10.Rxd8+ Nxd8 11.Re1+ Ne6 12.Qxa6 Kd8 13.b4 Qd7 14.Qxe6 Qxe6 15.Rxe6 Rf3 (28.084.684.569) 4981
best move: f7-f6 time: 94:56.000 min n/s: 4.981.695 nodes: 28.325.788.158

But the analysis on Immortalchess got some more, I hope you can find it:

[Event "Анализ"]
[Site "?"]
[Date "2012.03.25"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "2r1k2r/4qpp1/p3p2p/1pn1P3/3N2P1/P7/1PP3QP/1K1R2R1 w k - 0 1"]
[PlyCount "35"]

1. Nf5 exf5 2. gxf5 f6 (2... Rg8 3. Rd5 $5 (3. e6 $6 fxe6 4. fxe6 g5 $5 (4...
g6 5. Rgf1 a5 6. Rde1 b4 7. Qg3 Nxe6 8. Rxe6 Qxe6 9. Re1 Kd7 10. Rxe6 Kxe6 11.
axb4 axb4 12. Qg4+ Kf7 13. Qxb4 $16) 5. Rge1 g4 $13) 3... g5 (3... Qc7 4. Re1
g6 5. Re3 Rd8 6. Rxd8+ Kxd8 7. Qa8+ $1 (7. Qd5+ Kc8 8. Rc3 Rd8 9. Qxc5 Qxc5 10.
Rxc5+ Kb7 $16) 7... Qc8 8. Qd5+ Ke8 9. f6 $18) 4. Qh3 Na4 5. Qxh6 Qc7 6. Rc1
Nb6 7. Rd4 Qc5 8. c3 Nc4 9. Qh7 Rf8 10. e6 Qe5 11. f6 Qxe6 12. Rcd1 Qxf6 13.
Re4+ Ne5 14. Qh3 $18) 3. exf6 Qxf6 4. Qd5 Kf8 5. Rg6 Qf7 6. Qd6+ Kg8 7. Rdg1
Rh7 8. f6 Ne6 9. Qxa6 Qd7 10. Qb6 Re8 11. h4 Kh8 12. Qf2 Rf8 (12... gxf6 13.
Qf5 Qd8 14. Rxf6 Ng7 15. Qf3 Qe7 16. Rf1 Rg8 17. Qc3 $18) 13. Qf5 Qf7 14. fxg7+
Nxg7 15. Qxb5 Nf5 16. a4 Rg7 17. Rxg7 Nxg7 18. Qc6 $16]

OK, thanks !
I'll let SF thinks for 20 hours after 1. Nf5 exf5 2. gxf5 with 4 best moves to have a final opinion.

[EvgeniyZh]

First of all, thank you for your hard work.
Second, big part of positions was collected pretty long time ago, so I'm sorry to not provide mainlines from the very beginning, some of them are totally lost, and some require some time to find.

Here's what I have, not sure about quality

Code: Select all

r2qrbk1/1b3p2/3p2pB/1p1P1N2/1np1P3/5NRP/1P3PP1/1B1Qn1K1 w - - id ?; bm N3h4;

Code: Select all

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[FEN "r2qrbk1/1b3p2/3p2pB/1p1P1N2/1np1P3/5NRP/1P3PP1/1B1Qn1K1 w - - 0 1"]
[SetUp "1"]

1. N3h4 Qf6 2. Bg5 Qh8 3. Bd2 Nxd5 4. exd5 Ra1 5. Nxg6 fxg6 6. Rxg6+ Kf7 7. Bc3 Re5 8. Re6 Rxb1 9. Qxb1 Bxd5 10. Rxe5 Nf3+ *

Code: Select all

8/bp4Pk/4KB2/R6p/2pNp1P1/p7/3p1Pnq/2r5 w - - id ?; bm Nc6;

Code: Select all

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[FEN "8/bp4Pk/4KB2/R6p/2pNp1P1/p7/3p1Pnq/2r5 w - - 0 1"]
[SetUp "1"]

1. Nc6 bxc6 2. f4 exf3 3. g8=Q+ Kxg8 4. Rg5+ Kh7 5. Rg7+ Kh8 6. Rxa7+ Kg8 7. Ra8+ Kh7 8. Rh8+ Kg6 9. Rg8+ Kh7 10. Rg7+ Kh8 11. Rc7+ Kg8 12. Rc8+ Kh7 13. Kf7 Qc7+ 14. Rxc7 Nf4 15. Rc8 Ng6 16. gxh5 Kh6 17. hxg6 Kh5 18. Rh8+ Kg4 19. g7 Kf4 20. g8=Q d1=Q 21. Qg5+ Ke4 22. Qe5+ Kd3 23. Rd8+ Kc2 24. Qc3+ Kb1 25. Qa1+ Kc2 26. Qa2# *

Code: Select all

1rb2r1k/3p1pp1/p3p2p/1p2P3/4q3/1N2B1R1/PPP1N1P1/2KR1B2 w - - id ?; bm Nf4;

Code: Select all

[Event "?"]
[Site "?"]
[Date "?"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "1rb2r1k/3p1pp1/p3p2p/1p2P3/4q3/1N2B1R1/PPP1N1P1/2KR1B2 w - - 0 1"]
[PlyCount "14"]

1. Nf4 Qxe5 2. Bd3 Bb7 3. Rh1 Qd6 (3... Rbc8 4. Ne2 Bxg2 {+1.30}) 4. Nh5 Rg8 5. Nc5 Rbc8 6. Bf4 Qxf4+ 7. Nxf4 Rxc5 {+0.60} *

Code: Select all

2r1k2r/4qpp1/p3p2p/1pn1P3/3N2P1/P7/1PP3QP/1K1R2R1 w k - id ?; bm Nf5;

Code: Select all

[Event "?"]
[Site "?"]
[Date "?"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[FEN "2r1k2r/4qpp1/p3p2p/1pn1P3/3N2P1/P7/1PP3QP/1K1R2R1 w k - 0 1"]
[PlyCount "35"]
[SetUp "1"]

1. Nf5 exf5 2. gxf5 f6 (2... Rg8 3. Rd5 {!?} (3. e6 {?!} 3... fxe6 4. fxe6 g5
{!?} (4... g6 5. Rgf1 a5 6. Rde1 b4 7. Qg3 Nxe6 8. Rxe6 Qxe6 9. Re1 Kd7 10.
Rxe6 Kxe6 11. axb4 axb4 12. Qg4+ Kf7 13. Qxb4 {±})5. Rge1 g4 {∞})3... g5 (3...
Qc7 4. Re1 g6 5. Re3 Rd8 6. Rxd8+ Kxd8 7. Qa8+ {!} (7. Qd5+ Kc8 8. Rc3 Rd8 9.
Qxc5 Qxc5 10. Rxc5+ Kb7 {±})7... Qc8 8. Qd5+ Ke8 9. f6 {+⁠−})4. Qh3 Na4 5.
Qxh6 Qc7 6. Rc1 Nb6 7. Rd4 Qc5 8. c3 Nc4 9. Qh7 Rf8 10. e6 Qe5 11. f6 Qxe6 12.
Rcd1 Qxf6 13. Re4+ Ne5 14. Qh3 {+⁠−}) 3. exf6 Qxf6 4. Qd5 Kf8 5. Rg6 Qf7 6.
Qd6+ Kg8 7. Rdg1 Rh7 8. f6 Ne6 9. Qxa6 Qd7 10. Qb6 Re8 11. h4 Kh8 12. Qf2 Rf8
(12... gxf6 13. Qf5 Qd8 14. Rxf6 Ng7 15. Qf3 Qe7 16. Rf1 Rg8 17. Qc3 {+⁠−})
13. Qf5 Qf7 14. fxg7+ Nxg7 15. Qxb5 Nf5 16. a4 Rg7 17. Rxg7 Nxg7 18. Qc6 {±} *

Code: Select all

1k2r2r/1p1qb2p/p1p1b1p1/P2pPp2/1P1P4/2RB4/2PBQ1PP/1R4K1 w - - id ?; bm Rcb3;

Code: Select all

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "1k2r2r/1p1qb2p/p1p1b1p1/P2pPp2/1P1P4/2RB4/2PBQ1PP/1R4K1 w - - 0 22"]
[PlyCount "7"]

22. Rcb3 $3 (22. Bxa6 $6 bxa6 23. Qxa6 Qb7 24. Rxc6 Qxa6 25. Rxa6 $16) 22...
Qc7 23. b5 $1 axb5 24. Bxb5 cxb5 25. Rxb5 $18 *

[Paloma]

Code: Select all

2r1k2r/4qpp1/p6p/1pn1PP2/8/P7/1PP3QP/1K1R2R1 b k - 0 1

Analysis by Stockfish 240416 64 1T:

1. +/=  (0.63): 2...f6 3.exf6 Dxf6 4.Dd5 Kf8 5.Tg6 Df7 6.Dd6+ Kg8 7.Tdg1 Th7 8.f6 Se6 9.Dxa6 Tb8 10.h4 Kh8 11.fxg7+ Sxg7 12.Tf6 De7 13.Txh6 Txh6 
2. +/-  (0.75): 2...Tg8 3.Td5 g6 4.Tgd1 Dc7 5.Td6 a5 6.Dd5 gxf5 7.e6 Sxe6 8.Txe6+ Kf8 9.Te2 f4 10.Dxb5 Tg5 11.Dd3 Db6 12.Tf1 Df6 13.Te4 Tf5 
3. +/-  (0.98): 2...Dg5 3.Df3 De7 4.Td5 Sd7 5.Dg2 Sb6 6.Tdd1 Sc4 7.Dxg7 Tf8 8.Tge1 Dg5 9.Df6 Sd2+ 10.Ka1 Txc2 11.Dxa6 Dxf5 12.e6 fxe6 13.Dd6 

Depth was 38

[jdart]

[D] r4rk1/4bppp/bq2p3/npnpP3/p2B1P2/P1PB1N2/1P2QNPP/R4RK1 w - - 0 1

Komodo 9.0 acts weird on this one. It doesn't find Bxh7 for a very long time. But if I force Bxh7 it sees a winning score right away.

--Jon

[Laskos]

[D] r4rk1/4bppp/bq2p3/npnpP3/p2B1P2/P1PB1N2/1P2QNPP/R4RK1 w - - 0 1

Komodo 9.0 acts weird on this one. It doesn't find Bxh7 for a very long time. But if I force Bxh7 it sees a winning score right away.

--Jon

Interesting, tweaking not very much Dynamism and King Safety in Komodo 9.42 makes it to solve it fairly quickly.

[Eelco de Groot]

Here a little more after 1. Nf5 exf5 2. gxf5 Rg8 3. Rd5 from Tommy, 4 best moves. 3... g6 is still on top :

[D]2r1k1r1/4qpp1/p6p/1pnRPP2/8/P7/1PP3QP/1K4R1 b - -

Engine: Rainbow Serpent 20162803_030 MP ("Tommy Cooper", i7 6700, 4 threads, 512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott

35 810:53 +1.06 3...g6 4.Rgd1 Qc7 5.Rd6 a5 6.e6 fxe6
7.fxe6 b4 8.Qf1 Rg7 9.e7 Qxe7 10.Re1 Ne4
11.Rd4 Rf7 12.Qg1 Kf8 13.Rdxe4 Qg5
14.Rg4 Qc5 15.Rxg6 Qxg1 16.Rexg1 Rc4 (153.893.920.930) 3163

35 810:53 +1.22 3...Qc7 4.e6 fxe6 5.Re1 g6 6.fxe6 Rg7
7.Qd2 Qe7 8.Qxh6 Rg8 9.Qf4 Nxe6
10.Qd6 Rd8 11.Rxe6 Rxd6 12.Rdxd6 a5
13.Rxe7+ Kxe7 14.Rb6 Rh8 15.Rxg6 Kd7
16.Rg5 Kc6 (153.893.920.930) 3163

35 810:53 +1.39 3...Qg5 4.Qf2 Ne4 5.Qb6 Nd2+ 6.Ka2 Qxf5
7.Rxd2 Qe6+ 8.Qxe6+ fxe6 9.Rd6 Rxc2
10.Rxa6 Rd2 11.Rxe6+ Kd7 12.Rgg6 Rxh2
13.Ra6 Rc2 14.Ra7+ Ke8 15.Kb3 Rc8
16.Kb4 h5 (153.893.920.930) 3163

35 810:53 +1.40 3...h5 4.Rgd1 Qc7 5.e6 fxe6 6.Qg6+ Qf7
7.Rd8+ Rxd8 8.Rxd8+ Ke7 9.f6+ Qxf6
10.Qxf6+ Kxf6 11.Rxg8 g5 12.Kc1 h4
13.Kd2 Kf5 14.Rf8+ Kg4 15.Ke3 Kh3
16.Rg8 Kxh2 (153.893.920.930) 3163

35 810:53 +1.48 3...g5 4.Rgd1 Qc7 5.Qd2 Rh8 6.Qd4 Rg8
7.Rd6 a5 8.Rd5 a4 9.e6 fxe6 10.fxe6 Nxe6
11.Qe4 Qc6 12.Re1 Rc7 13.Qxe6+ Qxe6
14.Rxe6+ Re7 15.Rxh6 Re1+ 16.Ka2 Rf8 (153.893.920.930) 3163

best move: g7-g6 time: 811:03.500 min n/s: 3.163.053 nodes: 153.934.533.780

And after the main line, Black's main defense, a slight plus from White Point Of View in about the first 4 lines and Black definitely going down in 4 less good lines

[FEN "2r1k2r/4qpp1/p3p2p/1pn1P3/3N2P1/P7/1PP3QP/1K1R2R1 w k -"]

1. Nf5 exf5 2. gxf5 f6 3. exf6 Qxf6 4. Qd5 Kf8 5. Rg6 Qf7
6. Qd6+ Kg8 7. Rdg1 Rh7 8. f6 Ne6 9. Qxa6 Qd7 10. Qb6 {diagram} *

[D]2r3k1/3q2pr/1Q2nPRp/1p6/8/P7/1PP4P/1K4R1 b - -

Engine: Rainbow Serpent 20162803_030 MP ("Tommy Cooper", i7 6700, 4 threads, 512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott

36 898:14 +0.74 10...Re8 11.h4 h5 12.Qe3 Qf7 13.Qb3 Rd8
14.Qxb5 Rd1+ 15.Rxd1 Qxg6 16.Rd6 Nf8
17.Qc6 Qf7 18.a4 Rh6 19.a5 Rxf6
20.Rxf6 gxf6 21.a6 f5 22.Qg2+ Kh7
23.b4 f4 (192.118.286.931) 3564

36 898:14 +0.84 10...h5 11.Qe3 Rd8 12.h4 Re8 13.Qb3 Qf7
14.Qd5 Rd8 15.Qxb5 Rd1+ 16.Rxd1 Qxg6
17.Rd6 Nf8 18.Qc6 Qf7 19.a4 Rh6
20.a5 Rxf6 21.Rxf6 gxf6 22.a6 f5
23.Qg2+ Kh7 (192.118.286.931) 3564

36 898:14 +0.85 10...Qd5 11.Qa7 Rf8 12.fxg7 Re8
13.Re1 Qf5 14.Rgg1 Qh5 15.h4 Nxg7
16.Rxe8+ Qxe8 17.h5 Kh8 18.Qd4 Qxh5
19.Qf6 Qd5 20.Rf1 h5 21.Kc1 h4
22.Rd1 Qg8 23.Rd8 h3 (192.118.286.931) 3564

36 898:14 +0.87 10...Kf7 11.fxg7 Rxg7 12.Rxg7+ Nxg7
13.Qxh6 Qd4 14.Qg6+ Kf8 15.c3 Qe5
16.Rg5 Qe1+ 17.Ka2 Qe6+ 18.Qxe6 Nxe6
19.Rxb5 Ke7 20.Rh5 Nf4 21.Rh7+ Ke6
22.a4 Rc5 23.h4 Kd6 (192.118.286.931) 3564

36 898:14 +1.00 10...Ng5 11.h4 Ne6 12.Qe3 h5 13.Qb3 Rc4
14.a4 Nd4 15.Qg3 Ne2 16.Qb8+ Rc8
17.Qxb5 Qxb5 18.Rxg7+ Kh8 19.Rxh7+ Kxh7
20.Rg7+ Kh6 21.axb5 Nd4 22.b6 Rb8
23.b7 Ne6 (192.118.286.931) 3564

36 898:14 +1.23 10...Qc6 11.f7+ Kxf7 12.Qf2+ Kg8
13.Qe2 Re8 14.Re1 Nf4 15.Qxe8+ Qxe8
16.Rxe8+ Kf7 17.Rg4 Kxe8 18.Rxf4 g5
19.Rf5 Re7 20.Rxb5 Re1+ 21.Ka2 Re2
22.h3 Rxc2 23.a4 Kd7 (192.118.286.931) 3564

36 898:14 +1.37 10...Qf7 11.Qxb5 Ng5 12.Qf5 Rc6
13.h4 Rxf6 14.Rxf6 gxf6 15.hxg5 fxg5
16.Qc8+ Qf8 17.Qe6+ Qf7 18.Qd6 Qf8
19.Qd3 Re7 20.a4 Qe8 21.Qd5+ Qf7
22.Qc5 Kh7 23.a5 Qe6 (192.118.286.931) 3564

best move: Rc8-e8 time: 898:24.984 min n/s: 3.564.722 nodes: 192.191.987.443

[zullil]

Here a little more after 1. Nf5 exf5 2. gxf5 Rg8 3. Rd5 from Tommy, 4 best moves. 3... g6 is still on top :

[D]2r1k1r1/4qpp1/p6p/1pnRPP2/8/P7/1PP3QP/1K4R1 b - -

Latest Stockfish still prefers g6, but the evaluation is worsening:

Code: Select all

info depth 43 seldepth 74 multipv 1 score cp -125 nodes 72703627967 nps 43092466 hashfull 999 tbhits 10715298 time 1687154 pv g7g6 g1d1 e7c7 d5d6 a6a5 e5e6 f7e6 f5e6 g8g7 g2f1 e8e7 f1f4 c5e6 f4e5 c7c4 d6e6 e7f8 c2c3 f8g8 e6b6 b5b4 a3b4 a5b4 b6b4 c4a6 e5e4 g8h7 h2h4 h6h5 d1d5 a6f1 b1c2 c8c5 d5d8 g7f7 e4e6 f1f5 e6f5 c5f5 d8d2 g6g5 h4g5 h7g6 b4d4 f7h7 d4d8 g6g5 d8g8 g5f6 g8f8 h7f7 f8f7 f6f7 d2h2 f7e8 b2b4 e8d8 c3c4 f5f4 c2c3 h5h4 b4b5 d8d7 c4c5 d7c7

I'll leave the search running.