Heinz-Wilhelm Duenhaupt vs Jorn Sloth (1975)

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Heinz-Wilhelm Duenhaupt vs Jorn Sloth
8th Correspondence World Championship (1975) (correspondence), ICCF
Zukertort Opening: Symmetrical Variation (A04) · 0-1

White to move.

ANALYSIS [x]

0-1

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1

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Feb-28-18		Telemus: click for larger view What about 41.♖e6? 41.. gxh5 42.♖h6 41.. g5 42.♖f6 41.. b5 42.gxh6 gxh6 43.♖xg6 b4 44.g4 b3 45.gxf5 b2 46.♖g1 is in time.

Feb-28-18		whiteshark: Mainline accto Hiarcs Opening book: 5. O-O Nbd7 6. Qc2 Nb6 7. Na3 Be6 8. Ng5 Bg4 9. Nxc4 Bxe2 10. Ne5 Bh5 11. Re1 h6 12. Ne4 e6 13. Nxc6 bxc6 14. Nxf6+ gxf6 15. Bxc6+ Nd7 16. Qf5 Bg6 17. Rxe6+ Be7 18. Qxf6 Rg8 19. Re2 Kf8 20. Qf4 Rc8 21. Qxh6+ Rg7 22. d4 Kg8 23. Bb7 click for larger view

Feb-28-18		whiteshark: <Telemus: <What about 41.♖e6?>> click for larger view Black to move 1) -0.08 (42 ply) 41...gxh5 42.Re5 Rf7 43.Kd3 Kd6 44.f4 b6 45.Rb5 Kc6 46.Kc4 Kc7 47.Re5 Kd7 48.Kb4 Kc6 49.Kc4 Rf6 50.Kb4 Kd6 51.Kc4 Kd7 52.Kb5 h6 53.Kc4 Kc6 54.Kb4 Kb7 55.Kb5 Kc8 56.Kc4 Kd7 57.Kd4 Kc6 58.Kc4 Kd6 59.Kb5 Kc7 60.Re7+ Kc8 61.Re5 Kd8 62.Kc4 Rg6 63.Rxf5 Rxg3 64.Rxh5 b5+ 65.Rxb5 2) -0.08 (42 ply) 41...Rd6 42.Re7+ Rd7 43.Re6 gxh5 44.Re5 Rf7 45.Kd3 Kd6 46.f4 b6 47.Rb5 Kc6 48.Kc4 Kc7 49.Re5 Kd7 50.Kb4 Kc6 51.Kc4 Rf6 52.Kb4 Kd6 53.Kc4 Kd7 54.Kb5 h6 55.Kc4 Kc6 56.Kb4 Kb7 57.Kb5 Kc8 58.Kc4 Kd7 59.Kd4 Kc6 60.Kc4 Kd6 61.Kb5 Kc7 62.Re7+ Kc8 63.Re5 Kd8 64.Kc4 h4 65.gxh4 Rc6+ 66.Kb5 3) =0.00 (41 ply) 41...g5 42.Re5 Rf7 43.f4 gxf4 44.gxf4 Kc6 45.Kd3 b5 46.Kc3 Rd7 47.Rxf5 Re7 48.Rf8 Kd5 49.f5 Ke5 50.f6 Rd7 51.f7 Kf6 52.Rb8 Rxf7 53.Rxb5 Rc7+ 54.Kb4 Kg7 55.Rc5 Re7 56.Rc6 Rb7+ 57.Kc4 Rb1 58.Kd3 Rh1 59.Rb6 Rxh5 6.0 minute analysis by Stockfish 9 v010218 = = = click for larger view Black to move 1) -0.22 (38 ply) 40...Rd6 41.Re7+ Rd7 42.Re6 gxh5 43.Re5 Rf7 44.Kd3 Kd6 45.Rb5 Rd7 46.Ke3 Re7+ 47.Kd3 Rf7 48.f4 Kc6 49.Kc4 b6 50.Re5 Rf6 51.Rb5 h6 52.Re5 Kd6 53.Rb5 Kc7 54.Re5 Kc6 55.Rb5 Rf8 56.Re5 Kd7 57.Rb5 Kc7 58.Kd4 Rf7 59.Kc4 Kc6 60.Re5 Kd6 61.Rb5 Kc7 62.Re5 Kd7 2) -0.35 (37 ply) 40...Rd7 41.Re6 gxh5 42.Re5 Rf7 43.Kd3 Kd6 44.Rb5 Kc6 45.Kc4 b6 46.Re5 Kd6 47.Rb5 Kc7 48.Kd5 Rf8 49.Kd4 Kc6 50.Kc4 Rf6 51.Re5 Kd6 52.Kd4 h6 53.f4 Kc7 54.Rb5 Rf8 55.Rb1 Rd8+ 56.Ke5 Rd3 57.Rc1+ Kd7 58.Rh1 b5 59.Rxh5 b4 60.Rxh6 b3 61.Rh7+ Kc6 3) -0.34 (37 ply) 40...Rd8 41.Re7+ Rd7 42.Re6 gxh5 43.Re5 Rf7 44.Kd3 Kd6 45.Rb5 Kc6 46.Kc4 b6 47.Re5 Kd6 48.Rb5 Kc7 49.Kd5 Rf8 50.Kd4 Kc6 51.Kc4 Rf6 52.Re5 Kd6 53.Kd4 Rf7 54.Rb5 Kc6 55.Kc4 Rf8 56.Re5 Rf6 57.Rb5 Kd7 58.Kd4 h4 59.gxh4 Kc6 60.Kc4 Rh6 61.Rxf5 Rxh4+ 62.f4 b5+ 63.Kd4 Kb6 64.Rf6+ Ka5 65.Rf7 6.0 minute analysis by Stockfish 9 v010218 Looks like a marginally better alternative

Mar-01-18		Telemus: <whiteshark: Looks like a marginally better alternative> Which one? <1) -0.22 (38 ply) 40...Rd6 41.Re7+ Rd7 42.Re6> <2) -0.35 (37 ply) 40...Rd7 41.Re6> <3) -0.34 (37 ply) 40...Rd8 41.Re7+ Rd7 42.Re6> Looks like the position I suggested in every case. Btw, I didn't mention 41.. ♖d6 as a sensible reply to 41.♖e6, because of the obvious 42.♖e7+. +++ A general remark. This is a somewhat untypical rook ending with well-known 4:3 pawn formation, because of Black's king position. If the king would be on the king side ("the normal case"), Black's usual winning try is to push the b-pawn forward and, at some point, to support it with the king and leave the king side pawns unproteced. Since the king is closer to a b-pawn than to an a-pawn, the b-pawn offers more winning chances than an a-pawn. Compared to this general view, Black's king on c7 should be in White's favour, because the b-pawn is still on b7, while White can already attack the king side pawns. This in mind, 41.♖e6 is the natural move and it is very surprising that corr-GM Dünhaupt did not play it. And that he lost the game, too.

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