Dmitry Andreikin vs Viktor Forsberg (2016)

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Dmitry Andreikin vs Viktor Forsberg
Hasselbacken Open (2016), Stockholm SWE, rd 4, May-03
Scotch Game: General (C45) · 1-0

ANALYSIS [x]

FEN COPIED

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Jan-15-17		razetime: I found 25. c5! bxc5 26.Qa5+ Kd7 27. Qb5 Rc6 28. Ra3 Rc8 But miscalculated on 30. a4? Oh well.

Jan-15-17		Steve.Patzer: I dismissed 25. c5 because I thought Qxc5 would hold.

Jan-15-17		Steve.Patzer: Apparently I did not see 26. Rc3

Jan-15-17		diagonalley: ...hmmmmm... i tried white's 25th as it seemed the only move which offered progress, although i couldn't calculate more than five or six moves ahead. not really "insane" methinks.

Jan-15-17		An Englishman: Good Evening: Stumbled attempting to find a refutation of 25...dxc5. Could only see 26.Qd2 but did not feel certain that it worked. What is White's best?

Jan-15-17		Mazu: I guess after 25...dxc5 26.Qa4 would win, threatening Rd7+ & Qxa7+ simultaneously...

Jan-15-17		mel gibson: The computer gives only less than a pawn & a half advantage. 25. c5 (25. c5 (c4-c5 b6xc5 ♕b4-a5+ ♔c7-d7 ♕a5xa7+ ♖c8-c7 ♕a7-a5 ♖d8-c8 ♖d3xd6+ ♕e5xd6 ♖d1xd6+ ♔d7xd6 ♕a5-d2+ ♔d6-e5 ♕d2xg5+ ♔e5xe4 ♕g5-e3+ ♔e4-f5 ♕e3-f4+ ♔f5-g6 ♕f4-c4 ♔g6-f6 a2-a4 ♖c7-a7 ♕c4-h4+ ♔f6-g7 ♔g1-g2 h7-h6 ♕h4-f4 ♔g7-g6 h2-h4) +1.37/19 178) score = +1.37 depth 19

Jan-15-17		kurdistan: This is difficult level.

Jan-15-17		WorstPlayerEver: Ghe after two times d5, I just wanted to take a bet on c5. But but... what has this to do with puzzling!?? 😁😁😂

Jan-15-17		RandomVisitor: After 25.c5 click for larger view Komodo-10.1-64bit: <+1.38/28 25...dxc5 26.Qa4 Rd4 27.Qxa7+> Kd8 28.Rxd4+ cxd4 29.Qxb6+ Ke7 30.Rxd4 Qc5 31.Qxc5+ Rxc5 32.a4 Kf6 33.Kg2 Rc2 34.Rb4 Ra2 35.h4 h6 36.hxg5+ hxg5 37.Kf3 Kg6 38.Ke3 e5 39.Rb5 Ra3+ 40.Ke2 Rxa4 41.Rxe5 Ra3 42.Re6+ Kf7 43.Rc6 g4 44.e5 Ke7 +1.68/28 25...Kb7 26.Rxd6 Rxd6 27.cxd6 a5 28.Qd2 Rd8 29.d7 Qc5 30.h3 h6 31.Qd3 Qc6 32.Rd2 h5 33.Kg2 e5 34.g4 hxg4 35.hxg4 Qe6 36.f3 Qc6 37.Kf1 Qc5 38.Ke2 Rh8 39.Qd5+ Qxd5 40.Rxd5 Kc7 41.Kd3 Rd8 42.Kc4 Kc6 43.Rxe5 +2.31/28 25...Kb8 26.Rxd6 Rxd6 27.cxd6 Rd8 28.d7 Qc5 29.Qb2 Qe7 30.Qd4 g4 31.Kg2 h6 32.Kg1 e5 33.Qd5 h5 34.Qc6 Qc5 35.Qf6 Qc7 36.Qf5 Kb7 37.Kg2 Qc2 38.Rd6 Qc3 39.Rd5 Qc7 40.Qxh5 Rxd7 41.Qxg4 Re7 42.h4 Rf7 43.Qd1 Qc4 44.Rd7+ Rxd7 45.Qxd7+ Ka6 +3.11/28 25...g4 26.Ra3 Kb8 27.Qa4 Qg7 28.cxb6 Qb7 29.bxa7+ Ka8 30.Qd4 Rc6 31.Rb3 Qf7 32.Qa4 Qc7 33.Rb8+ Rxb8 34.axb8Q+ Kxb8 35.Qb3+ Rb6 36.Qxe6 Qc8 37.Qf7 Qb7 38.Qf4 Ka7 39.Qxg4 Rb4 40.Qf4 Qxe4 41.Qxd6 Rb6 42.Qc5 Ka6 43.Qa3+ Kb7 44.Rc1 h6 45.Qa5 Rb1 46.Qc7+ Ka8 47.Qc8+ Ka7 48.Qc5+ Kb7

Jan-15-17		drollere: why not 27. ... Ke7 with Kf8 to follow? putting a piece in pin is almost always a desperate move.

Jan-15-17		agb2002: The material is identical. Black threatens Qxe4. White has c5, Qa3 and Qa4. In the case of 25.c5 A) 25... bxc5 26.Qa5+ A.1) 26... Kd7 27.Rf3 A.1.a) 27... Ke8 28.Qxa7 Rd7 29.Rf8+ Kxf8 (29... Ke7 30.Rf7+ Kxf7 31.Qxd7+ and 32.Qxc8 wins) 30.Qxd7 A.1.a.i) 30... Ra8 31.Rxd6 looks winning (31... Rxa2 32.Rxe6). A.1.a.ii) 30... Rb8 31.Qxh7 wins a pawn but unclear. A.1.b) 27... Ke7 28.Qxa7+ Rd7 29.Rf7+ wins as above. A.1.c) 27... Rc7 28.Rf7+ wins. A.1.d) 27... Qg7 28.Qxa7+ Rc7 29.Qb6 Rc6 30.Qb7+ Rc7 31.Qb5+ and material is even but looks very good for White due to the position of the black pieces and the passed a-pawn. A.2) 26... Kc6 27.Qa6+ A.2.a) 27... Kc7 28.Qxa7+ Kc6 29.Rb3 with the threas Qb7# and Rb6# looks winning. A.2.b) 27... Kd7 28.Rxd6+ Ke7 -28... Kc7 29.Qxa7#; 28... Ke8 29.Rxe6+ wins- 29.Qxa7+ Ke8 30.Rd7 seems to win. A.3) 26... Kb7 27.Ra3 Ra8 28.Rb1+ Kc8 (28... Kc6 29.Qb5+ Kc7 30.Qb7#) 29.Qa6+ Kd7 30.Rb7+ Ke8 31.Qc6+ Kf8 32.Qc7 wins. A.4) 26... Kb8 27.Rb1+ Ka8 28.Qa6 unclear. B) 25... dxc5 26.Qa4, with the double threat Qxa7+ and Rd7+, looks very good for White. C) 25... Qxc5 26.Rc3 wins.

Jan-15-17		centralfiles: 27...Ke7 Qb7+ Ke8 Rf3

Jan-15-17		morfishine: <agb2002> What was hardest for me to see relates to your post referencing <25...dxc5> 26.Qa4, with the double threat Qxa7+ and Rd7+, looks very good for White. Thats hard to see, at least for me *****

Jan-15-17		kb2ct: All pieces except white;s queen zre optimized so a pawn sac to activate the pieces is called for

Jan-16-17		An Englishman: Good Evening: Thanks to all who pointed out 25...dxc5; 26.Qa4. Looks pretty good.

Jan-16-17		agb2002: <morfishine: <agb2002> What was hardest for me to see relates to your post referencing <25...dxc5> 26.Qa4, with the double threat Qxa7+ and Rd7+, looks very good for White. Thats hard to see, at least for me> I didn't have much time (I missed the quick mate after 26... Kb7(8) 27.Rb1+ Ka8 28.Qxa7+) and spent most of it with bxc5 so I could only give my impression with dxc5, without any line.

Jun-10-17		Oversight: I also see the difficulty with white having a better game after 25... dxc5. What follows seems to me to be 1. Qa4 Rxd3 2. Qxa7+ Kc6 3. Qa4+ Kb7 4. Rxd3 c4 5. Rd7+ Rc7 6. Rd8 Qa5 7. Qd1 Qf5 8. Qa4 Qa5 9. Qd1 Rf7 10. Rd7+ Rxd7 11. Qxd7+ Ka6 12. Qc8+ Kb5 13. Qxe6 h5 14. Qf5+ Kb4 15. Qb1+ Kc5 16. Qf5+ Kb4 17. Qb1+ Kc5 18. Qf5+ Kd4. with the game being relatively even.

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