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Martin Zumsande vs Peter Taylor
London Chess Classic Open (2013), London ENG, rd 9, Dec-15
Caro-Kann Defense: Panov Attack. Modern Defense (B13)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Mar-04-15  sfm: Terrific defense by Black, and the reward was close: after 64.-,Rxa4 the tablebases say "draw"!

But black must play 67,-,Rg4+ or -,Rxh7+, his natural -,Kb5 loses, as White finds the only winning reply.

Mar-04-15  Nerwal: Another case where the extra black pawn confuses Black and he loses by trying to support it instead of trying to set a drawn position ♖+♙ vs ♖ (a recent case : Carlsen vs G Guseinov, 2014). Without the a pawn Black would certainly play 65... ♔d7! 66. h7 ♔e7 and White is not in time to set a Karstedt win.
Mar-04-15  nummerzwei: So, 67...Rxh7+ 68.Kxh7 Kc5 draws. This means that 67...Kb5?? is just a blunder. By the way, <Nerwal>, what exactly is a <Karstedt win>? So far I've only come across the Karstedt draw.
Mar-04-15  Nerwal: <what exactly is a <Karstedt win>?>

The manoeuver that happened in Grischuk vs Anand, 2007 after 95... ♔xe6. The assessment of these positions depends on how far the black king stands from the squares f6/f7 (the need to capture the e6 pawn doomed Black in Grischuk - Anand). Those Lucena-style positions are not always winning with a flank pawn (but it would be also false to assume the h pawn never gives any winning chance at all).

Mar-07-15  nummerzwei: Now I see. I found the position in "Fundamental Chess Endings" (6.45), but with no reference to Karstedt.

However, in "Praxis des Turmendspiels"(position 5) I found Karstedt's original, slightly different version.

(In this endgame, it makes a slight difference if the defender's rook stands on the first, second or third row. Apparently the third is the most tenacious, but still losing.) Here it is:


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Max Karstedt, Deutsches Wochenschach 1909

1.Rc2 Ke7 2.Rc8 Kd6 3.Rb8 Rh1 4.Kb7 Rb1+ 5.Kc8 Rc1+ 6. Kd8 Rh1 7.Rb6+ Kc5 8.Rc6+ Kd5 9.Ra6 Rh8+ 10.Kc7 Rh7+ 11.Kb6 and wins

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