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Marie Sebag vs Josep Manuel Lopez Martinez
Aeroflot Open (2010), Moscow RUS, rd 3, Feb-11
Spanish Game: Morphy Defense. Breyer Defense Zaitsev Hybrid (C95)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Feb-11-10
Premium Chessgames Member
  sisyphus: R+B v R. Black blundered with 136...Ra1, just 15 moves short of a 50-move claim.
Feb-15-10  asianwarrior: <sisyphus> What is your recommendation instead of 136...Ra1?
Feb-16-10  chillowack: Marie worked very hard for this victory!

She probably learned a lot from it, too. This is a notoriously difficult ending to win.

Feb-16-10
Premium Chessgames Member
  sisyphus: 136...Rc2+ is the only move to draw (according to Mr. Nalimov).
Feb-16-10  chillowack: Did Mr. Nalimov provide analysis to back that up? Or is he saying that by forestalling the immediate threat, mate will now surely be deferred for at least 15 more moves?
Feb-16-10
Premium Chessgames Member
  sisyphus: Eugene Nalimov's 5-man tablebase shows there is no forced win after 136...Rc2+. You can check out all the possible lines yourself; my preferred resource is http://www.k4it.de/index.php?topic=...

If 136...Rc2+ had been found, the subsequent defense seems to be easier. But it's a technical challenge to hold, in any event; the stronger side wins 40 percent of the time.

I recall Marie Sebag holding this kind of endgame against Eti Stefanova, in a game played with a 10-second increment.

A Stefanova vs M Sebag, 2006

Feb-18-10  chillowack: My own analysis did not uncover a forced win for Sebag--though it did yield some interesting insights, such as the fact that the defender can often walk into discovered checks without fear (proven again in the Stefanova game you posted).
Mar-01-10
Premium Chessgames Member
  sisyphus: The simplest advice I've seen on this position is in the January 2010 Chess Life, "The Lazy Person's Guide to Endgames."

<Rook and Bishop versus Rook.... Draw.... Easy, if you know the key defensive position.... To defend, keep the rook on the opposite side of the board to your king and use it to pin the bishop. When your opponent’s king tries to unpin, head in the other direction with your own king....>

Nov-22-10  Sukhjinder: I think 136. ...Rc2+ was the best move for black..!!!
Sep-07-11  hilfsmatt: Did Sebag miss 135. Bc7+ ?
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