Author: Robert Hyatt
Date: 06:53:18 01/19/98
Go up one level in this thread
On January 19, 1998 at 07:42:39, Moritz Berger wrote: >On January 19, 1998 at 00:05:42, Robert Hyatt wrote: > >>Here's an interesting test position. This happened in a game on ICC >>tonite between Crafty and a human player (actually Halcion running >>Crafty if you try to find the game.) >> >>In this position, Bxe7 seems pretty natural, tactically. See if your >>program can find out in time that it is bad. This was a blitz game >>and Crafty didn't. Bxe7 fails to Nc4, although Crafty sees the entire >>line almost instantly, there is a tiny flaw at the end that makes this >>fall apart completely. >> >>here's the fen: >> >>2r3k/ppq1ppbp/3nb1p1/4p1B1/6P1/1NP2P2/PP1Q3P/K2R3R w - - >> >>to avoid losing this game, you'd have to play this in 10 seconds or >>so, as it was a 5 0 game I believe... I certainly can't do it... > >Fritz 5 (P233 MMX): > >also likes Bxe7 ... until >14s: Rhe1 -0.06 10/27 >25s: Rhe1 0.19 10/20 >48s: h4 0.22 10/30 >139s: h4 0.03 11/36 >153s: Rhe1 0.13 11/36 > >Hiarcs 6/Fritz engine (P233 MMX): > >h4 after 1s, never considers Bxe7 >Qf2 after 141s (Qf2 a5 h4 b5 h5 a4 h6 axb3 hxg7 Kxg7) += 0.65 > >Junior 4.6beta (P233 MMX): > >2s: Bxe7 >8s: Bxe7 += 0.81 12 semiply >22s: Bxe7 += 0.81 13 semiply >114s: Bxe7 += 0.00 14 semiply Bxe7 Nc4 Qd8+ Rd8+ Bf8 Rxf8+ Kg7 Re8 Qc6 >Bf8+ Kf6 Nc5 Qxf3 >210s: h4 += 0.60 14 semiply h4 a5 Nc1 f6 Be3 Qc6 Rhf1 b5 Nd3 As I mentioned in my previous post (re DarkThought) this is a positional evaluation issue. Fritz has code to create open positions where it's deep search is best-suited to play. Hiarcs doesn't like to attack at all, so its not prefering Be7 is not surprising. Junior I don't know much about, but It seems that it also likes to open the position as I am doing in Crafty. This isn't a tactical issue (at first). I suspect Junior's early searches were just like mine, ending with Bxg5 and ripping the king-side open, until it finds the stinger at the end that may draw...
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