Author: Enrique Irazoqui
Date: 08:47:36 01/04/03
Go up one level in this thread
On January 04, 2003 at 10:58:00, Roy Brunjes wrote: > >I have been studying the following position, with the help of various programs, >and I am not sure if this is a win for Black. This position was declared a win >for Black by some training software I am using. The commentator there says that >after: > > 1. Kg3 Kc2 > 2. Kxh3 Kxb2 > 3. Kh4 Kxa2 > > "White needs 8 moves to queen and Black needs only 4" > >The commentator then goes on to say that if instead of 1. Kg3, white tries 1. >b4, that 1. ... Kc4! follows and the game is over. > >However, as you can see from the pgn I post below, after I forced the first move >on each side (1. Kg3 Kc2) Chess Tiger 14 plays 2. b4 and the game seems to be a >much tougher win for Black, if indeed a win still exists. Odd how the >commentator sees 1. b4 but not the possiblity of 2. b4 after the Black King has >gone too far "south" to provide the same defense it could a move earlier. By >the way, Tiger wanted to play 1... Ke3 instead of 1. ... Kc2. Given a bit more >time, Tiger switches to Ke2 with the following played in the 30+30 shootout I am >running: 1. Kg3 Ke2 2. a3 h2 3. Kxh2 Kxf3 4. Kg1 Kxf4 and the eval is hugely in >Black's favor. So it would appear that 1. ... Ke2 is superior to the >commentator's suggested 1. ... Kc2. > >I post below the analysis of Chess Tiger 14 (48 MB hash) generated by the H8 GUI >option "shootout" with a time control of 10 minutes + 15 seconds per move >increment on my 1.6 GHz laptop. Tiger seemed to average about 20-25 seconds per >move at this time control. > >Tiger is a respectable endgame player and it can only see a draw after many >moves. Is Tiger right? I am running the shootout again, this time with 30 >minutes + 30 seconds per move increment to see if additional time makes any >difference in the result. > >Here is the diagram ... > >[D] 8/8/6p1/1p3p2/5P2/3k1P1p/PP3K2/8 w > >And here is the 10+15 shootout output from Chess Tiger 14.0 on my P4 1.6 GHz >laptop using 48 MB for hash: > >1. Kg3 Kc2 2. b4 Kd3 3. a4 bxa4 4. b5 a3 5. b6 a2 6. b7 a1=Q 7. b8=Q Qe1+ 8. >Kxh3 Ke3 9. Qe5+ Kf2 10. Kh4 Qh1+ 11. Kg5 Qh5+ 12. Kf6 Kxf3 13. Qd6 Qg4 14. Qd2 >Qxf4 15. Qd1+ Kg2 16. Qc2+ Qf2 17. Qc6+ Kh2 18. Qb7 g5 19. Kxg5 f4 20. Qh7+ Kg2 >21. Qe4+ f3 22. Kf6 Qb2+ 23. Kf5 Qe2 24. Qg4+ Kf1 25. Kf4 f2 26. Qg6 Qc4+ 27. >Kg3 Qc3+ 28. Kh2 Qc7+ 29. Kh3 Qc8+ 30. Kg3 Qb8+ 31. Kh3 Qh8+ 32. Kg3 Qe5+ 33. >Kh3 Qe3+ 34. Kh2 Qf4+ 35. Kh3 Qf3+ 36. Kh2 Qd5 37. Qb1+ Ke2 38. Qb2+ Qd2 39. >Qe5+ Qe3 40. Qb2+ Ke1 41. Qb1+ Kd2 42. Qa2+ 1/2-1/2 > >It appears to me that the commentator missed an important continuation for both >sides: > > A. 1. ... Ke2 appears superior to 1. ... Kc2 > B. After 1. Kg2 Kc2 it appears that 2. b4! draws > >What do you folks think? What do your programs think? Thanks for your help! > >Roy Hi Roy, I don't see how it could be a draw. 8/8/6p1/1p3p2/5P2/3k1P1p/PP3K2/8 w - - 0 1 Analysis by Fritz 8: 1.Kg3 Ke3 2.b4 -+ (-3.06) Depth: 7/11 00:00:00 10kN 1.Kg3! -+ (-2.78) Depth: 8/17 00:00:00 14kN 1.Kg3 Ke2 2.a3 h2 -+ (-2.59) Depth: 8/17 00:00:00 16kN 1.Kg3-- -+ (-2.87) Depth: 9/14 00:00:00 20kN 1.Kg3 Ke2 2.a3 h2 3.Kg2 h1Q+ 4.Kxh1 Kxf3 5.Kg1 Kxf4 6.Kf2 g5 7.b3 Ke4 -+ (-4.72) Depth: 9/34 00:00:00 42kN, tb=4 1.Kg3! -+ (-4.44) Depth: 10/24 00:00:00 59kN, tb=4 1.Kg3! -+ (-4.16) Depth: 10/24 00:00:00 63kN, tb=4 1.Kg3! -+ (-3.59) Depth: 10/24 00:00:00 68kN, tb=4 1.Kg3 Ke2 2.b4 Ke3 3.a3 h2 4.Kxh2 Kxf4 5.Kg2 -+ (-2.50) Depth: 10/26 00:00:00 76kN, tb=4 1.Kg3-- -+ (-2.81) Depth: 11/22 00:00:00 85kN, tb=4 1.Kg3 Ke2 2.a3 h2 3.Kxh2 Kxf3 4.b3 Kxf4 5.a4 bxa4 6.bxa4 Ke5 7.a5 Kd6 -+ (-2.94) Depth: 11/34 00:00:00 154kN, tb=5 1.Kg3-- -+ (-3.22) Depth: 12/28 00:00:00 169kN, tb=6 1.Kg3 Ke2 2.a3 h2 3.Kg2 h1Q+ 4.Kxh1 -+ (-3.28) Depth: 12/31 00:00:00 219kN, tb=12 1.Kg3 Ke2 2.a3 h2 3.Kg2 h1Q+ 4.Kxh1 Kxf3 5.b3 Kxf4 -+ (-3.28) Depth: 13/25 00:00:00 318kN, tb=19 1.Kg3-- -+ (-3.56) Depth: 14/27 00:00:01 440kN, tb=46 1.Kg3 Ke3 2.a3 h2 3.Kxh2 Kxf3 4.b3 Kxf4 5.Kg1 Ke4 6.a4 b4 7.Kf2 g5 -+ (-3.81) Depth: 14/42 00:00:01 543kN, tb=63 1.Kg3-- -+ (-4.09) Depth: 15/25 00:00:02 640kN, tb=95 1.Kg3 Ke3 2.a3 h2 3.Kxh2 Kxf3 4.b3 Kxf4 5.Kg1 Ke4 6.a4 b4 7.Kf1 -+ (-4.12) Depth: 15/35 00:00:03 908kN, tb=170 1.Kg3 Ke3 2.a3 h2 3.Kxh2 Kxf3 4.b3 Kxf4 5.Kg1 Ke4 6.Kf1 g5 7.a4 -+ (-4.22) Depth: 16/29 00:00:04 1254kN, tb=381 1.Kg3 Ke3 2.a3 h2 3.Kxh2 Kxf3 4.Kg1 Kxf4 5.Kf2 Ke4 6.b3 g5 7.Kg2 f4 -+ (-4.37) Depth: 17/32 00:00:07 1934kN, tb=855 1.Kg3-- -+ (-4.66) Depth: 18/31 00:00:09 2507kN, tb=1374 1.Kg3 Ke3 2.a3 h2 3.Kxh2 Kxf3 4.Kg1 Kxf4 5.Kf2 g5 6.b3 g4 7.Kg2 Ke5 -+ (-4.69) Depth: 18/40 00:00:12 3718kN, tb=2066 1.Kg3-- -+ (-4.97) Depth: 19/34 00:00:16 4972kN, tb=2994 1.Kg3 Ke3 2.a3 h2 3.Kxh2 Kxf3 4.Kg1 Kxf4 5.Kf2 g5 6.b3 g4 7.Kg2 Ke5 -+ (-5.34) Depth: 19/43 00:00:22 7563kN, tb=4909 1.Kg3 Ke3 2.a3 h2 3.Kxh2 Kxf3 4.Kg1 Kxf4 5.Kf2 g5 6.b3 g4 7.Kg2 Ke5 -+ (-5.34) Depth: 20/36 00:00:33 10416kN, tb=7951 1.Kg3-- -+ (-5.62) Depth: 21/39 00:00:45 15682kN, tb=13627 1.Kg3 Ke3 2.a3 h2 3.Kxh2 Kxf3 4.Kg1 Kxf4 5.Kf2 g5 6.b3 g4 7.Kg2 Ke3 -+ (-9.09) Depth: 21/56 00:01:24 31600kN, tb=26421 1.Kg3 Ke3 2.a3 h2 3.Kxh2 Kxf3 4.Kg1 Kxf4 5.Kf2 g5 6.b3 g4 7.Kg2 Ke3 -+ (-9.09) Depth: 22/42 00:02:07 46375kN, tb=41661 1.Kg3-- -+ (-9.37) Depth: 23/45 00:03:24 87234kN, tb=80090 1.Kg3 Ke3 2.a3 h2 3.Kxh2 Kxf3 4.Kg1 Kxf4 5.Kf2 Ke4 6.Ke2 f4 7.b3 f3+ 8.Kf1 g5 9.Kf2 g4 -+ (-9.50) Depth: 23/50 00:04:50 131320kN, tb=130794 (Irazoqui, MyTown 04.01.2003)
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