Author: Amir Ban
Date: 08:13:36 01/19/98
Go up one level in this thread
On January 19, 1998 at 09:53:18, Robert Hyatt wrote: >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... Actually my current version here goes to h4 in 8 seconds on PP200 MHz. A lucky break perhaps, or unlucky for the 4.6 engine. Junior is symmetrical, and will look into opening/closing positions objectively. Amir
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