Author: Francis Monkman
Date: 12:32:13 05/26/99
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
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