Author: William Bryant
Date: 16:25:58 01/12/00
Go up one level in this thread
On January 12, 2000 at 10:55:17, Djordje Vidanovic wrote:
>On January 12, 2000 at 10:40:05, Albert Silver wrote:
>
>
>>>This position, after 23.Ne4 is very instructive. Enrique seems to be right that
>>>programs that do not spot the mate threat in this position tend to fall prey to
>>>fast finders. I've had enough time to check on several progs -- the successful
>>>ones (fast finders) took only a couple of seconds at the most to spot both the
>>>threat and the mate: Crafty 17.6 SMP, Fritz 6 (all test versions), Deep Junior
>>>6, Hiarcs 7.32... I haven't set up my Tiger 12, but am sure that it would spot
>>>the mate in a split second :) Programs that had a hunch something was wrong
>>>with capturing on a2: Genius 6.5, Zarkov 5.1, Wchess 1.2a (none of these saw
>>>the coming mate quickly, but assigned a hefty bonus to White after capturing).
>>>I was pretty upset to find out that Rebel Century could not at least "intuit"
>>>about the coming threat to his King via the check on c8 and the subsequent
>>>checking on g5 with a quick mate. Has anyone tried the previous Rebels?
>>>
>>>Djordje
>>
>>How long does it take Genius 6.5 to see this? I ran this on Genius 3 and it saw
>>it was mate in 7 after Bxa2 after 2 min 47 on a K6-2/350.
>>
>> Albert Silver
>
>
>Albert, I have tried Genius 3 under Genius 6.5 and lo and behold it saw mate in
>7 in only 23 seconds with my connection on! It actually played the move in 39
>seconds (PII-400). It appears that I simply hadn't been patient with Genius in
>my previous try, as Genius 6.5 needs approximately the same time to see mate in
>7 as Genius 3, of course, after the tragic Bxa2. The moral: never ever
>underestimate Genius.
>
>*** Djordje
Screamer (build 47) with passed pawn extensisons added
spots the mate at 5 seconds following a fail low and switches moves by 6
seconds.
without the passed pawn extension it fails high at 6 seconds and avoids the move
without returning a mate score.
It then takes 2 seconds to find the mate.
William
wbryant@ix.netcom.com
Welcome to Screamer (Beta) 1.00 Build 47
Current Hash Table Size: 8192 K bytes
Current Pawn Hash Size: 2048 K bytes
Debug Control On
PVS Search
NULL move Search
New Board Position
6k1/pp2rpp1/3pb1p1/8/4N3/4P3/PP3PPP/2R3K1 b - - 0 23 ;am Bxa2
Move 1 B>>
PLY NODES TIME SCORE PV
______________________________________________
5/00 8797 0:00 -0.07 Bxa2 Nxd6 Be6 e4 Kf8
6/00 19630 0:00 -0.10 Bxa2 Nxd6 Rd7 Nb5 Rd2 Rc7
7/00 56848 0:00 -0.10 Bxa2 Nxd6 Rd7 Nb5 Rd2 Rc8+ Kh7 Rc7
8/00 133486 0:01 -0.05 Bxa2 Nxd6 Rd7 Nb5 Rd2 Nxa7 Rxb2 Rc7
9/00 305023 0:04 --
9/00 407986 0:05 +327.53 Bxa2 Rc8+ Kh7 Ng5+ Kh6 f4 Kh5 h3 Re8 Rxe8 Kh4
Rh8+ Kg3 Ne4++
9/01 463111 0:06 ++ Bg4
9/01 962553 0:13 +0.89 Bg4 Nxd6 Rd7 Ne4 Be6 b3 Kf8 Nc5 Re7
9/03 1434442 0:19 +0.77 Kh8 Nxd6 Rd7 Nb5 Rd2 Nxa7 Rxb2 a4 Rd2
9/05 2032431 0:27 +0.32 d5 Nc3 Kf8 Kf1 Ke8 Rd1 Rd7 Ke2 Ke7
----- Search Stopped -----
Total Search Time: 0:27
Move: d5
//This is the version without passed pawn extension
Screamer b47 (exachess)
Starting Screen Log
New Board Position
6k1/pp2rpp1/3pb1p1/8/4N3/4P3/PP3PPP/2R3K1 b - - 0 23
Move 1 B>>
PLY NODES TIME SCORE PV
______________________________________________
3/00 3904 0:00 +0.00 Bxa2 Rc8+ Kh7 Nxd6
4/00 5040 0:00 -0.10 Bxa2 Nxd6 Bd5 Kf1
5/00 8773 0:00 -0.07 Bxa2 Nxd6 Be6 e4 Kf8
6/00 19540 0:00 -0.10 Bxa2 Nxd6 Rd7 Nb5 Rd2 Rc7
7/00 56504 0:00 -0.10 Bxa2 Nxd6 Rd7 Nb5 Rd2 Rc8+ Kh7 Rc7
8/00 133339 0:01 -0.05 Bxa2 Nxd6 Rd7 Nb5 Rd2 Nxa7 Rxb2 Rc7
9/00 299949 0:04 --
9/00 381783 0:05 +4.41 Bxa2 Rc8+ Kh7 Ng5+ Kh6 f4 Re8 Rxe8 Kh5 Ra8 a6
e4
9/01 458872 0:06 ++ Bg4
9/01 825700 0:11 +0.89 Bg4 Nxd6 Rd7 Ne4 Be6 a4 Kf8 Nc5 Re7
9/03 1258131 0:16 +0.67 f6 Nxd6 Rd7 Nc8 Rd2 Nxa7 Rxb2 a4 Kf7
9/08 1686695 0:21 +0.64 Kh7 Nxd6 Bxa2 Nc8 Rd7 Nxa7 Rd2
9/09 2142117 0:28 +0.32 d5 Nc3 Kf8 Kf1 Ke8 Rd1 Rd7 Ke2 Ke7
10/00 2933240 0:39 +0.36 d5 Nc3 Rc7 Kf1 b5 a3 a5 Ke2 b4 axb4 axb4
----- Search Stopped -----
Total Search Time: 0:41
Move: d5
Move 2 W>>
Previous Move: d5 Undone
//This clears the hash table
Move 1 B>>
Move: Bxa2
Move 2 W>>
PLY NODES TIME SCORE PV
______________________________________________
3/00 1749 0:00 +4.41 Rc8+ Kh7
4/00 1779 0:00 +4.41 Rc8+ Kh7
5/00 1809 0:00 +4.41 Rc8+ Kh7
6/00 1839 0:00 +4.41 Rc8+ Kh7
7/00 1869 0:00 +4.41 Rc8+ Kh7
8/00 1899 0:00 +4.41 Rc8+ Kh7
9/00 16852 0:00 ++ Rc8+
9/00 189769 0:02 +327.54 Rc8+ Re8 Rxe8+ Kh7 Ng5+ Kh6 f4 Kh5 h3 Kh4 Rh8+
Kg3 Ne4++
10/00 461558 0:05 +327.54 Rc8+ Re8 Rxe8+ Kh7 Ng5+ Kh6 f4 Kh5 h3 Kh4 Rh8+
Kg3 Ne4++
----- Search Stopped -----
Total Search Time: 0:05
Move: Rc8+
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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