Author: Charles Milton Ling
Date: 14:15:33 05/27/99
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On May 26, 1999 at 15:32:13, Francis Monkman wrote: >Here's an interesting trap Suba set an opponent at Las Palmas, 1979: > >rq2r1k1/5pbp/4pnp1/2NbN2n/1p3P2/1P4PP/PB3QBK/2RR4 w - - > >If White plays g4?, as he did in the game, he loses immediately to Nxf4! >Qxf4 Rxa2 and White played Rc2, but there's no defense. > >The only program that appeared not even to consider g4 was Genius 4, >Genii 3 & 6 (under Genius 6 GUI) took about 8 seconds to prefer Bd4 >(which according to Suba is correct). > >Next were CM6000, which took about 14 seconds for g4 to go bad, played >Ba1 (not a bad move?) after 32, Bd4 after 45, and, >Rebel10, which took 28 seconds on g4, settled (after Ncd7 and Nc6) on Bd4 >at 1:06, allotting it a score of +.94 (?). > >Then, fourth equal, near enough, were LGG 2.0 and Junior 5, both finding >Bd4 after about 3 minutes. > >Fritz 5.32 is still hung on g4 after *at least* 5 minutes. Maybe 10?... > >Hiarcs 7 plays g4 'happily', even awarding it +191 for two minutes, after which >it drops to +159. At three minutes, it drops to -95, but it's not until 6:30 >that >H7 finds an alternative, Nc6 (-33). This is still the choice at 17:45. It >finally reaches Bd4 by 50:00 or so. > >Crafty 16.6 spotted the winning line after about 2 minutes, but as you see: > >depth=10 25/53 -0.17 1. g4 Nxf4 2. Qxf4 Rxa2 3. Rc2 Nxg4+ 4. hxg4 Rxb2 >5. Qxf7+ Kh8 6. Rxb2 Bxe5+ 7. Kg1 Bxb2 8. Bxd5 exd5 9. Rxd5 >Nodes: 37763067 NPS: 89276 >Time: 00:07:02.99 > >Suba was expecting the *spurious* mate attack Qxf7+ etc., but it wasn't played! >Soon after, Crafty gets it. > >depth=10 26/53 -0.14 1. Ba1 Bxg2 2. Kxg2 Ra3 3. Rc2 Qa8+ 4. Kg1 Ne4 >5. Nxe4 Qxe4 6. Nc4 Raa8 7. Bxg7 Nxg7 >Nodes: 40524144 NPS: 88569 >Time: 00:07:37.54 (these times are a few seconds late, grabbed with copy/paste) > >CSTal II played g4 until 10:02, then preferred Ba1. > >Interesting stuff. > >Francis Interesting. My Fritz 5.32 reacted differently (Pentium II 266 MHz, 16 MB hash tables). Liked g4 up to 1:18 (minutes/seconds), then Ned7 1:55 Nc6 4:22 Bxd5 5:45 Ba1 9:15 Bd4 (which it considers =). Charley
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