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Marie Sebag vs Natalija Pogonina
Women's World Championship Knockout Tournament (2015), Sochi RUS, rd 3, Mar-23
Spanish Game: Berlin Defense (C65)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Mar-23-15  dumbgai: Chessbomb gives 81...Ra5 instead of ...h4 as holding the draw. The idea is that b6 allows a swap of rooks, so even though white promotes first, there is no mating net. I think John Nunn said that in KQR-KQR or KQQ-KQQ without pawns, whoever checks first wins. Because Q+R are able to coordinate very effectively to mate the opposing king.
Mar-23-15  norami: The tablebase confirms that after the pawns promoted in this game, whoever has the next move wins.
Mar-23-15  Nerwal: <Chessbomb gives 81...Ra5 instead of ...h4 as holding the draw. The idea is that b6 allows a swap of rooks, so even though white promotes first, there is no mating net.>

Indeed but from the pratical point of view the mistake is 79... ♖a1+. After 79... h5 Black is in time so the draw isn't difficult anymore. The main problem Black has in this endgame is that with the king stuck on g6 and the white rook on fifth rank the endgame h pawn vs ♖ is always lost even with one or two extra tempi.

Mar-23-15
Premium Chessgames Member
  AylerKupp: <Nerwal> The 6-piece Nalimov tablebases indicate that the game is a draw after 79...Ra1+. They also indicate that it is a draw after 80...h5. The losing move is 81...h4; as Chessbomb and <dumbgai> indicated, 81...Ra5 holds the draw. If then 82.Rc6+ Kf5 83.b6 h4 84.b7 Ra7


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Now if 85.Kc8, 85...Rxb7 86.Kxb7 h3 and White can only prevent Black's h-pawn from queening by giving up her rook.

Mar-23-15  cro777: Pogonina lost a theoretically drawn rook endgame.

Position after 55.Rxh4


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This endgame is a draw.

Pogonina made a serious mistake by playing 55...Rb2 (she should have played 55...Ra6). After 55...Rb2 the endgame is theoretically won for Sebag (White mates in 40).

May-18-15  notyetagm: M Sebag vs N Pogonina, 2015

Game Collection: REMOVING THE GUARD OF A CHK SQ FROM MINED SQ 35 Rd5xd6! removes defender of e5-chk sq from d6-mined sq

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