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Alejandro de Leon Justo vs Rui Camejo Almeida
Lisbon Open (2001), Lisbon POR, rd 6, Aug-26
Sicilian Defense: Najdorf. Amsterdam Variation (B93)  ·  1/2-1/2



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Kibitzer's Corner
Aug-04-04  who: Are there guidelines to when 2 knights can beat a king and a pawn, or did this guy just screw up
Aug-04-04  sneaky pete: This endgame has been researched a century ago by Russian analyst A.A.Troitsky, who demonstrated the Knights always win if the black pawn is blocked no further than a4/b6/c5/d4/e4/f5/g6/h4. Donner (1977) suggests that the Knights also win against a black pawn blocked on b5/g5. In a few exceptional positions, the Knights win against a pawn that is further advanced. The winning procedure is extremely difficult (at least for ordinary mortals) and may last over 60 moves, so in practical play hardly anyone plays it right. This is one of the 5 piece endings that has been "solved" by Ken Thompson's program Belle. The present game might have been won by white, if he would have had a cd-player with Belle's cd-rom's built in his head.
Aug-04-04  Dougy: Hmmm... after 71. Ndxf6+ the tablebases say mate in 39. However from the final position - it's mate in 62.

71...Kg6 72.Kd3 Kf5 73.Nh5 Kg4 74.Nhg3 Kf3 75.Kd2 Kf4 76.Ke2 Kg4 77.Ke3 Kh3 78.Nf5 Kg4 79.Ne7 Kh3 80.Kf3 Kh4 81.Nd5 Kh5 82.Kg3 Kh6 83.Kh4 Kg7 84.Kg5 Kf7 85.Kf5 Kf8 86.Kf6 Ke8 87.Ke6 Kd8 88.Kd6 Ke8 89.Kc7 Kf8 90.Kd8 Kf7 91.Kd7 Kf8 92.Ne7 Kf7 93.Nf5 Kf8 94.Nfd6 Kg7 95.Ke6 Kg6 96.Nf5 Kh5 97.Ne3 Kg6 98.Ke7 Kg7 99.Nf5+ Kg6 100.Nfg3 Kg7 101.Ke8 Kg6 102.Kf8 Kh7 103.Kf7 Kh6 104.Kf6 Kh7 105.Nf5 Kg8 106.Ke7 Kh7 107.Kf7 Kh8 108.Ng5 e4 109.Nh4 e3 110.Ng6#

Apr-06-09  David2009: In the NN vs P ending, if the defender has a central Pawn, a reasonably simple strategy for the attacker is to build a fortress - i.e. place both Ns in front of the P. In the present game, De Leon Justo vs R Camejo Almeida, 2001 White started excellently setting up the fortress but failed to follow through. On move 77

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White is to play and can try 77 Kc6 Ke6 78 Kc7 Ke7 79 Kc8 e.g. (A) 79... Kd8 Nd5 or (B) 79... Ke6 80.Kd8 Kf7 81. Kd7 Kf8 82. Nd5 Kf7 83. Ne7 Kg7 84. Ke8 Kh6 85 Nf5+ Kh5 86 Ne3 (the fortress!) Kg6 87 Kf8 Kh6 88 Kf7 and Black can choose between being mated on h1 or h8. This is not necessarily the shortest win but it is systematic.

The Nalimov database can be consulted for the shortest path if required, but the shortest mate is not always the most systematic. Tip on using this database: you can move the pieces around on the board and cut-and-paste the FEN position that results.

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