Author: Mark Young
Date: 21:22:21 08/03/00
Go up one level in this thread
On August 03, 2000 at 23:52:54, blass uri wrote: >I do not understand one of Fritz6's moves. > >[D]8/8/PnP3k1/2K5/7p/3rN3/8/8 w - - 0 1 > >Fritz6 played 75.Nc4 and lost against Junior5 when my Fritz6 light with >tablebases plays 75.Kxb6 with a draw. > >Is it a tablebase bug in Fritz6? > >Uri Yes, this is a bug in fritz 6a, and I think it is a known bug that is correct in the other patch <not a free patch, you have to buy a cd>. Fritz 6 old does not have this bug, and would play the correct move. Fritz 6a will play the correct move but needed more time, but if you set the tablebase depth to 0 in Fritz 6a it will correct this problem, but at the cost of search speed because of the amount of tablebase hits to the harddrive. All examples below. New position 8/8/PnP3k1/2K5/7p/3rN3/8/8 w - - 0 1 Analysis by Fritz 6: 1.Kxb6 -+ (-2.75) depth: 1/5 00:00:00 1.Kxb6 Rxe3 -+ (-2.12) depth: 1/5 00:00:00 1.a7 -+ (-1.91) depth: 1/5 00:00:00 1.a7 -+ (-1.78) depth: 1/5 00:00:00 1.a7 Na8 -+ (-1.81) depth: 2/7 00:00:00 1.a7 Na4+ 2.Kb5 Nc3+ 3.Kb6 -+ (-1.78) depth: 3/9 00:00:00 1.a7 Na8 2.Nd5 Kf5 -+ (-2.06) depth: 4/11 00:00:00 2kN 1.Ng2! -+ (-2.03) depth: 4/14 00:00:00 4kN 1.Ng2 Na4+ 2.Kb5 Rd4 3.a7 -+ (-1.91) depth: 4/14 00:00:00 4kN 1.Kxb6! -+ (-1.87) depth: 4/14 00:00:00 4kN 1.Kxb6 Rxe3 -+ (-1.62) depth: 4/14 00:00:00 5kN 1.Kxb6 Rb3+ 2.Kc7 Rxe3 3.a7 Re8 µ (-1.37) depth: 5/10 00:00:00 6kN 1.Kxb6 Rxe3 2.a7 Re8 3.Kb7 Kf5 -+ (-1.50) depth: 6/14 00:00:00 9kN 1.Kxb6 Rb3+ 2.Kc7 Rxe3 3.a7 Ra3 -+ (-1.44) depth: 7/16 00:00:00 25kN 1.Kxb6 Rb3+ 2.Ka7 Rxe3 3.c7 Rc3 4.Kb7 Rb3+ 5.Kc6 µ (-1.19) depth: 8/16 00:00:00 64kN 1.Kxb6! µ (-0.87) depth: 9/19 00:00:00 176kN 1.Kxb6! Rb3+ 2.Ka7 Rxe3 3.c7 Rc3 4.Kb7 Rb3+ = (0.00) depth: 9/19 00:00:00 194kN 1.Kxb6! Rxe3 2.c7 Re8 3.Kb7 h3 4.c8Q Rxc8 ³ (-0.37) depth: 10/20 00:00:00 341kN, tb=5 1.Kxb6! ³ (-0.69) depth: 11/18 00:00:00 621kN, tb=6 1.Kxb6 Rxe3 2.c7 Re8 3.Kc6 h3 4.Kd7 Rh8 5.a7 h2 -+ (-4.44) depth: 11/20 00:00:01 739kN, tb=14 1.Ng2 -+ (-4.41) depth: 11/22 00:00:01 997kN, tb=16 1.Ng2 Rb3 2.Nxh4+ Kf6 3.a7 Na8 4.Ng2 Ra3 5.c7 Rc3+ -+ (-2.72) depth: 11/26 00:00:03 3085kN, tb=17 1.Nc4 -+ (-2.69) depth: 11/26 00:00:07 6451kN, tb=23 1.Nc4 Nxc4 2.c7 Ne3 3.a7 Ra3 4.Kb5 Nf5 5.Kb4 Nd6 -+ (-2.31) depth: 11/26 00:00:08 7194kN, tb=25 1.Nc4 Nxc4 2.c7 Ne3 3.a7 Ra3 4.Kb5 Nf5 5.Kb4 Nd6 -+ (-2.31) depth: 12/29 00:00:11 9264kN, tb=72 1.Nc4 Nxc4 2.c7 Ne3 3.a7 Ra3 4.Kb5 Nf5 5.Kb4 Nd6 -+ (-2.31) depth: 13/28 00:00:17 13953kN, tb=177 1.Nc4 Nxc4 2.c7 Ne3 3.a7 Ra3 4.Kb5 Nf5 5.Kb4 Nd6 -+ (-2.28) depth: 14/34 00:00:36 29396kN, tb=444 1.Kxb6 -+ (-2.25) depth: 14/34 00:00:40 32722kN, tb=562 1.Kxb6! -+ (-1.94) depth: 15/32 00:00:57 46706kN, tb=812 1.Kxb6! Rxe3 2.a7 Re8 3.Kb7 h3 4.a8Q Rxa8 5.Kxa8 h2 = (-0.25) depth: 15/32 00:01:01 49892kN, tb=977 1.Kxb6 Rxe3 2.a7 Re8 3.Kb7 h3 4.c7 h2 5.c8Q Rxc8 = (0.00) depth: 16/33 00:01:13 58297kN, tb=1569 (Young, 03.08.2000) New position 8/8/PnP3k1/2K5/7p/3rN3/8/8 w - - 0 1 Analysis by Fritz 6 Old: 1.Kxb6 -+ (-2.81) depth: 1/4 00:00:00 1.Kxb6 Rxe3 -+ (-2.44) depth: 1/4 00:00:00 1.a7 -+ (-2.25) depth: 1/4 00:00:00 1.a7 Rxe3 -+ (-2.12) depth: 2/2 00:00:00 1.a7 Rxe3 -+ (-2.12) depth: 3/7 00:00:00 1.a7 Na8 2.Ng2 Kg5 -+ (-2.28) depth: 4/6 00:00:00 1.Ng2! -+ (-2.16) depth: 4/8 00:00:00 1.Kxb6! -+ (-2.09) depth: 4/8 00:00:00 1.Kxb6 Rb3+ 2.Kc7 Rxe3 3.Kd6 -+ (-2.00) depth: 4/8 00:00:00 1.Kxb6 Rb3+ 2.Kc5 Rxe3 3.a7 Re8 -+ (-2.00) depth: 5/7 00:00:00 1.Kxb6 Rb3+ 2.Kc5 Rxe3 3.Kd4 Re7 4.Kd5 -+ (-2.09) depth: 6/11 00:00:00 1kN 1.Kxb6! = (-0.25) depth: 7/13 00:00:00 4kN 1.Kxb6 Rb3+ 2.Ka7 Rxe3 3.c7 Re8 4.Kb7 = (-0.25) depth: 8/15 00:00:00 8kN 1.Kxb6 Rb3+ 2.Ka7 Rxe3 3.c7 Re8 4.Kb7 = (-0.25) depth: 9/17 00:00:00 18kN, tb=3 1.Kxb6 Rxe3 2.c7 Re8 3.Kb7 h3 4.c8Q Rxc8 5.Kxc8 h2 ³ (-0.44) depth: 10/21 00:00:00 131kN, tb=17 1.Kxb6-- µ (-0.75) depth: 11/21 00:00:00 330kN, tb=49 1.Kxb6 Rb3+ 2.Kc7 Rxe3 3.a7 Re8 4.Kb7 µ (-1.34) depth: 11/23 00:00:00 553kN, tb=64 1.Kxb6! µ (-1.03) depth: 12/25 00:00:01 1687kN, tb=214 1.Kxb6! Rb3+ 2.Kc5 Rxe3 3.c7 Kf6 4.Kd6 Rd3+ 5.Kc6 h3 ³ (-0.66) depth: 12/25 00:00:02 2101kN, tb=342 1.Kxb6! ³ (-0.34) depth: 13/26 00:00:04 3899kN, tb=565 1.Kxb6! Rb3+ 2.Ka7 Rxe3 3.c7 Re8 4.Kb7 h3 5.c8Q Rxc8 = (0.00) depth: 13/28 00:00:05 4412kN, tb=584 1.Kxb6 Rb3+ 2.Ka7 Rxe3 3.c7 Re8 4.Kb7 h3 5.c8Q Rxc8 = (0.00) depth: 14/29 00:00:09 8163kN, tb=1227 1.Kxb6 Rb3+ 2.Ka7 Rxe3 3.c7 Re8 4.Kb7 h3 5.c8Q Rxc8 = (0.00) depth: 15/32 00:00:22 17870kN, tb=3188 (Young, 03.08.2000) New position 8/8/PnP3k1/2K5/7p/3rN3/8/8 w - - 0 1 Analysis by Fritz 6: (tablebase depth set to 0) 1.Kxb6 -+ (-2.75) depth: 1/2 00:00:00 1.Kxb6 Rxe3 -+ (-2.12) depth: 1/3 00:00:00 1.a7 -+ (-2.09) depth: 1/4 00:00:00 1.a7 Na8 -+ (-1.81) depth: 1/4 00:00:00 1.a7 Na8 2.Nd5 -+ (-1.75) depth: 2/4 00:00:00 1.Ng2 µ (-1.16) depth: 2/6 00:00:00 1.Ng2 Na4+ 2.Kb5 µ (-1.34) depth: 3/7 00:00:00 1.Ng2 Na4+ 2.Kb5 Nc3+ 3.Kc4 µ (-1.16) depth: 4/10 00:00:00 1.Ng2 Kg5 2.Nxh4 µ (-1.19) depth: 5/9 00:00:00 1.Ng2 Kg5 2.Nxh4 Nc8 3.Kc4 Rg3 µ (-1.19) depth: 6/10 00:00:00 1kN 1.Ng2 Kg5 2.Kxb6 h3 3.Ne1 Rb3+ 4.Ka7 -+ (-1.41) depth: 7/15 00:00:00 6kN 1.Kxb6 µ (-1.19) depth: 7/17 00:00:00 21kN 1.Kxb6 Rb3+ µ (-1.19) depth: 8/14 00:00:00 28kN 1.Kxb6! µ (-0.87) depth: 9/19 00:00:00 76kN, tb=6 1.Kxb6! Rb3+ 2.Ka7 Rxe3 3.c7 Rc3 4.Kb7 Rb3+ = (0.00) depth: 9/19 00:00:00 97kN, tb=7 1.Kxb6 Rb3+ 2.Ka7 Rxe3 3.c7 Rc3 4.Kb7 = (0.00) depth: 10/20 00:00:00 241kN, tb=131 1.Kxb6-- ³ (-0.47) depth: 11/21 00:00:00 590kN, tb=307 1.Kxb6 Rxe3 2.c7 Re8 3.Kc6 h3 4.Kd7 Rh8 5.c8Q Rxc8 -+ (-2.69) depth: 11/21 00:00:01 676kN, tb=537 1.Ng2 -+ (-2.66) depth: 11/24 00:00:02 1632kN, tb=724 1.Nc4 -+ (-2.62) depth: 11/26 00:00:07 5635kN, tb=1341 1.Nc4 Nxc4 2.c7 Ne5 3.a7 Ra3 4.Kb5 Nf7 5.Kb4 Nd6 -+ (-2.31) depth: 11/26 00:00:08 6184kN, tb=1393 1.Nc4 Nxc4 2.c7 Ne3 3.a7 Ra3 4.Kb5 Nf5 5.Kb4 Nd6 -+ (-2.31) depth: 12/29 00:00:12 8386kN, tb=1997 1.Kxb6 -+ (-2.28) depth: 12/29 00:00:12 8637kN, tb=2239 1.Kxb6 Rxe3 2.a7 Re8 3.Kb7 h3 4.a8Q Rxa8 5.Kxa8 h2 = (0.00) depth: 12/29 00:00:13 9081kN, tb=2434 1.Kxb6 Rxe3 2.a7 Re8 3.Kb7 h3 4.a8Q Rxa8 5.Kxa8 h2 = (0.00) depth: 13/26 00:00:14 9638kN, tb=2970 1.Kxb6 Rxe3 2.a7 Re8 3.Kb7 h3 4.a8Q Rxa8 5.Kxa8 h2 = (0.00) depth: 14/29 00:00:18 11240kN, tb=4766 (Young, 03.08.2000)
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