Difficult studies

[Nordlandia]

No 19331 | Akobia | First price | EG October 2013 Supplement, Page 383

[d]5N2/N1p2r2/5P2/Kp6/p7/8/2k1P3/2B5 w - - 0 0

http://www.viewchess.com/cbreader/2017/ ... 23453.html

[Nordlandia]

No 19384 | V. Kirillov & E. Kudelich | Honourable mention | EG October 2013 Supplement, page 398

Possible cook

Winning 8-man EGTB position.

[d]1K6/8/2P3P1/1R6/8/5n2/4rrPk/6b1 w - - 0 0

http://www.viewchess.com/cbreader/2017/ ... 43843.html

[peter]

Hi Jon!
Thanks for starting a new thread, the old one was getting a little confusing.

No 19331 | Akobia | First price | EG October 2013 Supplement, Page 383

[d]5N2/N1p2r2/5P2/Kp6/p7/8/2k1P3/2B5 w - - 0 0

http://www.viewchess.com/cbreader/2017/ ... 23453.html

After some Forward-Backward, I get this output with full Syzygys:

5N2/N1p2r2/5P2/Kp6/p7/8/2k1P3/2B5 w - - 0 1

Analysis by Stockfish MateFinder 64:

1.Ba3 Kb3 2.Nxb5 c6 3.e4 Rxf6 4.Nd7 Rg6 5.Nc5+ Ka2 6.Nd6 Kxa3 7.Nc4+ Ka2 8.Kxa4 Kb1 9.Kb3 Rg3+ 10.Kb4 Kc2 11.Nd6 Rg5 12.Kc4 Re5 13.Kd4 Rd5+ 14.exd5
= (0.00) Depth: 39/28 00:00:59 788MN, tb=39949243

At 8.Kxa4 it's a drawn 7some Position.

After your SF- line in cb- reader with 2.Bc5 instead of Nxb5:

5N2/N1p2r2/5P2/KpB5/p7/1k6/4P3/8 b - - 0 1

Analysis by Stockfish MateFinder 64:

2...Kc4 3.Ne6 Rxf6 4.Nxb5 Rxe6 5.Nxc7 Rxe2
= (0.00) Depth: 39/31 00:00:35 631MN, tb=38169984

Yet it might be won after the last move of your line with ...2...b4 (?)

So yet cooked

[Nordlandia]

Cook detected

Bishop promotion

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "k3r3/3N2pP/2K4P/pP1R4/8/7r/B6p/4b3 w - - 0 1"]
[PlyCount "12"]

1. Nb6+ Kb8 2. Nd7+ Ka7 3. b6+ Ka8 4. hxg7 Rxh7 5. Rxa5+ Bxa5 6. Bd5 h1=B $19 *

[/pgn]

[Nordlandia]

Check if your engine of choise can solve this one

No 17948 | J. Timman
[d]1R6/2B2r1k/p4p2/pP6/3b2p1/1P5p/1P3P1P/4K3 w - - 0 0

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "1R6/2B2r1k/p4p2/pP6/3b2p1/1P5p/1P3P1P/4K3 w - - 0 0"]
[PlyCount "9"]

1. b6 Be5 2. Bxe5 Re7 3. f4 gxf3 4. Rb7 Rxb7 5. Bc7 $18 *

[/pgn]

[Nordlandia]

Possible cook detected

Winning 8-man EGTB position.

No 17963 | A. Manvelyan | 6th price

4n3/PRP1Pk2/8/Kbn5/4q3/7B/8/8 w - - 0 0

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "4n3/PRP1Pk2/8/Kbn5/4q3/7B/8/8 w - - 0 0"]
[PlyCount "10"]

{[#]} 1. a8=Q Nxb7+ 2. Qxb7 Qxb7 3. c8=Q Qa7+ 4. Kb4 Qa4+ 5. Kc5 Nf6 *

[/pgn]

[Nordlandia]

Possible cook

Akobia & R. Becker | EG July 2012, page 225

[d]4rk1K/8/5p2/p7/2p3N1/P5R1/2P5/3b4 w - - 0 0

----------

M. Kovacevic | First price | White wins

However, Stockfish is stuck on 0.00 evaluation after 1.b7 ...Bd6

[d]5b2/2Np4/p7/1P6/8/P4P2/2nk4/B4K2 w - - 0 0

[Nordlandia]

Check if your engine can solve this one

[d]8/bp4Pk/3K1B2/R6p/2pNp1P1/p7/3p1Pn1/2r4q w - - 0 0


image uploader

[Paloma]

deleted

[Paloma]

3...gxf3 is wrong.
After 3...g3! no wining score evaluated.
[pgn]
[Event "?"]
[Site "?"]
[Date "2017.03.05"]
[Round "?"]
[White "Difficult studies"]
[Black "?"]
[Result "?"]
[Annotator "?"]
[SetUp "1"]
[FEN "1R6/2B2r1k/p4p2/pP6/3b2p1/1P5p/1P3P1P/4K3 w - - 0 1"]
[PlyCount "19"]

1. b6 $1 Be5 $1 2. Bxe5 Re7 $1 3. f4 gxf3
$4 (3... g3 $1 4. b7 gxh2 5. Rh8+ Kxh8 6. b8=Q+ Kg7 7. Qa8 fxe5 8. Qe4 Kg8 9. Qd5+ Kf8 10. Kf2 Rd7 11. Qa8+ Kf7 12. Kg3 Rd2 13. Kxh3 exf4 14. Qe4 Rf2 15. Kg4 f3 16. Qd5+ Kg7 17. Qe5+ Kf7 18. Qf5+ Ke7 19. Qc5+ Ke6 20. Qb6+ {+1.79})

[/pgn]