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Rune Djurhuus vs Yrjo A Rantanen
EUR-chT (Men) 9th (1989), Haifa ISR, rd 3, Nov-??
Sicilian Defense: Closed Variation (B25)  ·  1/2-1/2

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
May-04-20
Premium Chessgames Member
  g15713: Two Rooks and Bishop versus Two Rooks ending (krrbkrr)

<"There was some discussion of whether this ending (and its cousin krrnkrr) is a general win after Yakov Konoval and I generated a database for it almost seven years ago. There was no definitive conclusion, except that White usually, but not always, wins. I think there may be certain fortresses Black can build if his rooks are well placed and his king is not stuck at the edge of the board, but I don't have a good understanding when that happens.">
Marc Bourzutschky from Rybka Chess Community Forum July 13 2012

E. 1.0 Starting position
Black to move after 48. Bxa5


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Syzygy 'https://syzygy-tables.info/?fen=5rk...

<(The position above of from the game Djurhuus-Rantanen, 1989. It is an example where the weaker side draws without being able to force an exchange or exert a pin.)

48...Rc8+ (This should have lost in 51 moves to capture.)
But why certain moves lose or draw is difficult to fathom.

48...Rf7 (The only move to draw) 49. Ra6 Kh7 Surprisingly

48...Rg7 49. Ra6 (loses as well, in 43 moves to capture.)>
Marc Bourzutschky from Rybka Chess Community Forum July 13 2012

E. 1.1 Line 1
48...Rc8+ 49. Kd6 Rg7 50. Ra6! Rc2 51. Be1 Kh7 52. Ra3! wins


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E. 1.2 Line 2
48...Rg7 49. Ra6! Rgf7 50. Kd5 Rf5+ 51. Ke4 Rf4+ 52. Kd3 Rf3+
53. Ke2 Rf2+ 54. Kd1 Rf1+ 55. Be1 R8f2 56. Ra8+! Kf7 57. Rc6! wins


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E. 1.3 Line 3
48...Rf7! (The only move to draw as Bourzutschky notes)
49. Ra6 Kh7 =


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Black threatens 50...Rg6 forcing the exchange of a pair of rooks.

Attacker must watch out for positions where the weaker side can force a perpetual rook trade threat, leading to a draw.

Instead the game continued after 48. Bxa5:

48...Rc8+ 49. Kd6 Rg7 50. Rxg7+? Kxg7 =

E. 1.4
Leads to a theoretical draw of Rook + Bishop versus Rook ending


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Syzygy 'https://syzygy-tables.info/?fen=2r5...

Reference: 'http://www.rybkaforum.net/cgi-bin/r...

By mbourzut Date 2012-07-13 02:42 Edited 2012-07-13 03:18

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