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S Franklin Manotas vs Herman van Riemsdijk
I American Continental (2001), Cali COL, rd 4, Aug-13
Spanish Game: Morphy Defense. Chigorin Defense Panov System (C99)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
Feb-20-04
Premium Chessgames Member
  Honza Cervenka: A rare ending of two Bishops and King against Knight and King. 116...Be7 117.Kh6 (The Knight cannot move on g1 or f2 for 117...Bg5 and 118...Be8#) 117...Bb5 would have won the game a little bit quicklier as white Knight is trapped, for example 118.Ng1 Kg4 or 118.Nf2 Bc5 119.Nh3 (119.Nd1 Bd4; 119.Nh1 Kg4) 119...Kg4 120.Ng5 Be3 or 118.Kh5 Be2+ 119.Kh6 Bc5 etc.
Aug-24-04  Rowson: I still find it hard to except that white lost this when it was K+N and two pawns vs K and two bishops??
Aug-26-06  sfm: I think the position after Blacks 62th move must be a draw. White then advances his d-pawn which rapidly loses it.
Jul-08-08  4tmac: An amazing ending. IMHO (like I wasn't using a tablebase or something) the pawns may have served to both "waive" the 50 move rule plus helped start the 2B+N ending with the white pieces on the edge of the board. It may be a win. Through some black inaccuraces (you know how humans are) the win may have slipped away but whites 106. N-h6? helped black by putting his knight on the edge of the board after which black could beat 50 moves. N-d4 or N-e3 were better.
Aug-26-10  Bonifratz: This is madness!
Oct-30-10
Premium Chessgames Member
  Domdaniel: It seems that 115.Nf4 is a blunder, losing the Knight quickly. He can't escape via d5 because of 115.Nf4 Kf5 116.Nd5 Bc6 117.Nc3 Bb4 118.Na2 Be1 119.Nc1 Bf3+ 120.Kh6 Bd2+ and ...Bxc1.

White only has to reach move 135 to claim a draw by the 50-move rule. 115.Nh4 comes close, but seems to fail too: 115.Nh4 Bd6 116.Nf3 Ba4 117.Kh4 Kf5 118.Ng1 Bb5 119.Nh3 Bc4 120.Nf2 Bd5 121.Nh3 Bb4 122.Ng1 Be1+ 123.Kh3 Kf4 124.Ne2+ Ke3 125.Ng1 Kf2 126.Kh2 Bc3 127.Nh3+ Kf3 128.Ng5+ Kg4 129.Nh7 Bg7 130.Kg1 Be4 131.Ng5 Kxg5 ... and White falls just 4 moves short of the line.

I've checked these with an engine but didn't use tablebases, so I have no idea whether the moves are optimal. Maybe there is a way for White to survive -- although there's a beautiful logic to the winning method, driving the King to the edge and into the mating zone, while trying to detach the knight from its boss.

I dimly recall a period when FIDE extended the (arbitrary) 50-move rule to 70 moves (or more?) for certain endings ... was this one of them?

Oct-30-10
Premium Chessgames Member
  Domdaniel: Apparently it can take 66 moves to force a win if the Knight defends correctly. Could be worse: another pawnless ending takes 243 moves.

http://en.wikipedia.org/wiki/Pawnle...

Oct-31-10  Shams: <I dimly recall a period when FIDE extended the (arbitrary) 50-move rule to 70 moves (or more?) for certain endings ... was this one of them?>

Up to 100 for some of the "Halley's Comet" endings, if memory serves.

Oct-31-10  4tmac: 81. N-N7! gave better chances for 50 moves (then bring the W ♔ over with the ♘) :)
Sep-29-17
Premium Chessgames Member
  Jonathan Sarfati: A good case of how computers have changed endgame verdicts. At one time, it was thought that the N fianchetto was a fortress. But computers showed that it could be broken, i.e. it was a semi-fortress. Then the attacker could stop the defender from re-establishing the fortress in another corner. From the semi-fortress position, it's 45 moves, so IM van Riemsdyk may well have won against best play. Clearly he knew the computer verdict on the position.

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