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Nafisa Muminova vs Anna Muzychuk
FIDE Women's Grand Prix Khanty - Mansiysk (2014), Khanty-Mansiysk RUS, rd 4, Apr-12
Sicilian Defense: Nezhmetdinov-Rossolimo Attack. Fianchetto Variation (B31)  ·  0-1
ANALYSIS [x]

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Kibitzer's Corner
Apr-12-14  shakh.i.shekh: Did White mis-defend the RP and BP ending? I thought it was a book draw with proper technique. Anyone with a table analysis have an opinion?
Apr-13-14  Nerwal: <I thought it was a book draw with proper technique.>

Many positions with this material are drawn (but far from all; in Keres vs Sokolsky, 1947 white is already winning after 63... ♖a1, with the pawns still on f3 and h4!), true, but in practical play white's winning chances are still quite high. Even elite players have lost it (quite recent examples : Grischuk vs Eljanov, 2008 Kramnik vs Aronian, 2008 ).

Muminova started to go wrong as early as move 64 :

64. ♔f2 loses while 64. ♔g2 draws. But the winning manoeuver after 64. ♔f2 is extremely complex, starting with 64... ♖b3+ ▢ 65. ♔f3 h3 ▢ and the pawn goes to h2.

64... ♔g4? only draws.
65. ♖a4+!, only drawing move.
66. ♖c4 is losing to 66... ♖b2+.
73. ♔e2 is the wrong side (73. Kg2!)
75... ♔g3 only draws. Playing the rook on the second rank wins; this is the main difficulty of this endgame, knowing when to transpose into a winning ♖+♙ vs ♖ endgame, although here it's easy to figure that ♖xh4+ ♔g3 mate or winning the rook loses.

78. ♔f1 is the decisive mistake; black should wait along the g file. It's not easy to see why; one explanation is that the rook doesn't have the checking distance after 81. ♖f5 ♔g3 82. ♖g5+ ♔f4; this defence would draw were the rook on last rank. After 78. ♔f1 Anna Muzychuk played perfectly to convert. Muminova played on a bit too long, maybe hoping for something like 92... ♔f4 93. ♖h8 ♖g1+ 94. ♔f2 h1=♕ 95. ♖xh1 ♖xh1 stalemate.

Apr-14-14
Premium Chessgames Member
  4tmac: 75...Ra2! would have yielded all B wants - pin ♔ on back rank & use h Pawn as decoy


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*defense*: ♔-f2 to prevent the activation of the B king. In case the danger of being pushed back arises, ♔ should go to g2 and, if checked along the seventh rank, to h3. This applies for the position with the pawn on h4, after h4-h3, ♔ should go to h2. The rook should stay on a8 or around it, to be ready to check from big distance. (Thx GM Marin & Chessbase)

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