Author: Ernst Walet
Date: 11:34:23 02/27/01
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On February 27, 2001 at 12:18:53, Sune Larsson wrote: > > [D]8/8/pp6/3b2K1/1P6/PN2k3/8/8 w - - 0 1 > > > This is old swedish chess history. The above position happened in a game > between Bergkvist and Stolz, Stockholm 1941. White is in deep trouble. > Knight moves to a1 or c2 will just lose the lonely one. But the knight > has a more brave possibility! 1.Na5!! actually saved the draw for white. > After 1.-bxa5 2.bxa5 black has the wrong bishop and white's king can just > make it to a1, if black goes for both the white a-pawns. > > The game went like this: 1.Na5!! Kd3 2.Kf6 Kc3 3.Ke5 Bg2 4.Kd6 b5 5.Kc5 Kb2 > 6.Kb6 Kxa3 7.Kxa6 ½-½ > > Test: This is a difficult one for chess programs and presupposes > extended knowledge about a/h pawn and the wrong bishop. > > Sune Hi Sune, Fritz6 plays Na5 in one minute one second on my P3-500 with 128MB hash and 3+4 EGTB, but a draw score is out of reach. Ernst. New position 8/8/pp6/3b2K1/1P6/PN2k3/8/8 w - - 0 1 Analysis by Fritz 6: 1.Nc5 bxc5 2.bxc5 -+ (-1.72) Depth: 1/4 00:00:00 1.Nc5 bxc5 2.bxc5 -+ (-1.72) Depth: 1/4 00:00:00 1.Nc1! µ (-0.87) Depth: 1/4 00:00:00 1.Nc1! ³ (-0.37) Depth: 1/4 00:00:00 1.Nc1 Ke4 ³ (-0.37) Depth: 2/3 00:00:00 1.Nc1-- ³ (-0.69) Depth: 3/6 00:00:00 1.Nc1-- Kd2 2.b5 Kxc1 3.bxa6 -+ (-1.59) Depth: 3/7 00:00:00 1.Na1! -+ (-1.41) Depth: 3/7 00:00:00 1.Na1! Ke4 2.Nc2 ³ (-0.34) Depth: 3/7 00:00:00 1.Na1 Ke4 2.Nc2 Bc6 ³ (-0.31) Depth: 4/8 00:00:00 1.Na1 Ke4 2.Nc2 Bb3 3.Ne1 ³ (-0.34) Depth: 5/10 00:00:00 1kN 1.Na1 Ke4 2.Nc2 Kd3 ³ (-0.37) Depth: 6/10 00:00:00 2kN 1.Na1 Ke4 2.Nc2 Kd3 3.Na1 Kd4 ³ (-0.37) Depth: 7/10 00:00:00 4kN 1.Na1 Ke4 2.Nc2 Kd3 3.Na1 Bf7 4.Kf5 Bc4 ³ (-0.31) Depth: 8/12 00:00:00 9kN 1.Na1 Ke4 2.Nc2 Bc6 3.Ne1 Bb7 4.Kf6 Bc6 5.Ng2 ³ (-0.34) Depth: 9/16 00:00:00 20kN 1.Na1 Ke4 2.Nc2 Bc6 3.Ne1 Bb7 4.Kf6 Kd4 5.Ke6 Bd5+ ³ (-0.31) Depth: 10/15 00:00:00 38kN 1.Na1-- ³ (-0.62) Depth: 11/18 00:00:00 90kN 1.Na1-- Kd3 2.Kf6 Kc3 3.Ke5 Ba8 4.b5 Kb2 5.bxa6 Kxa1 µ (-0.97) Depth: 11/18 00:00:00 118kN 1.Na1 Kd3 2.Kf6 Kc3 3.Ke5 Ba8 4.Kd6 Kb2 5.Kc7 b5 µ (-0.97) Depth: 12/19 00:00:00 196kN 1.Na1-- µ (-1.28) Depth: 13/20 00:00:00 265kN 1.Na1-- Kd3 2.Kf6 Kc3 3.Ke5 Bc4 4.Kd6 Kb2 5.Kc7 b5 -+ (-2.37) Depth: 13/20 00:00:01 390kN, tb=1 1.Na1 Kd3 2.Kf6 Kc3 3.Ke5 Bc4 4.Kd6 Kb2 5.Kc7 b5 -+ (-2.44) Depth: 14/23 00:00:02 690kN, tb=3 1.Na1-- -+ (-2.75) Depth: 15/20 00:00:02 871kN, tb=8 1.Na1-- Kd3 2.Kf6 Kc3 3.Ke5 Bc4 4.a4 Kb2 5.a5 bxa5 -+ (-2.81) Depth: 15/21 00:00:03 1127kN, tb=11 1.Na1 Kd3 2.Kf6 Kc3 3.Ke5 Bc4 4.a4 Kb2 5.a5 b5 -+ (-2.91) Depth: 16/22 00:00:04 1777kN, tb=44 1.Na1 Kd3 2.Kf6 Kc3 3.Ke5 Bc4 4.a4 Kb2 5.a5 b5 -+ (-2.97) Depth: 17/23 00:00:08 3139kN, tb=209 1.Na1 Kd3 2.Kf6 Kc3 3.Ke5 Bc4 4.a4 Kb2 5.a5 b5 -+ (-2.97) Depth: 18/25 00:00:13 5157kN, tb=508 1.Na1 Kd3 2.Kf6 Kc3 3.Ke5 Bc4 4.a4 Kb2 5.a5 b5 -+ (-2.97) Depth: 19/29 00:00:29 11515kN, tb=1755 1.Na1-- -+ (-3.28) Depth: 20/29 00:00:51 20487kN, tb=5365 1.Na1-- -+ (-3.28) Depth: 20/29 00:00:54 21882kN, tb=5468 1.Na5! -+ (-3.25) Depth: 20/29 00:01:01 24801kN, tb=6504 1.Na5! bxa5 2.bxa5 Bc4 3.Kf6 Kd4 4.Ke7 Ke5 5.Kf8 Bb3 -+ (-3.03) Depth: 20/29 00:01:08 28171kN, tb=7079 1.Na5 bxa5 2.bxa5 Bc4 3.Kf6 Kd4 4.Kf5 Ba2 5.Kf4 Bb1 -+ (-3.03) Depth: 21/29 00:01:56 48588kN, tb=15301 1.Na5 bxa5 2.bxa5 Bc4 3.Kf6 Kd4 4.Kf5 Ba2 5.Kf4 Bb1 -+ (-3.03) Depth: 22/29 00:02:55 73275kN, tb=23861 1.Na5 bxa5 2.bxa5 Bc4 3.Kf6 Kd4 4.Kf5 Ba2 5.Kf4 Bb1 -+ (-3.03) Depth: 23/30 00:05:15 131333kN, tb=46406
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