Author: Robert Hyatt
Date: 19:43:00 05/18/00
Go up one level in this thread
On May 18, 2000 at 18:09:30, blass uri wrote:
>On May 18, 2000 at 16:05:17, Ernst A. Heinz wrote:
>
>Hi Ernst,
>>Hi Uri,
>>
>>Please excuse that I mixed up your names and called you
>>"Blass" in my previous post.
>
>I am not angry.
>>
>>> I do not know if you do something right about king safety or if your king
>>> safety is too big and it can help to solve some test positions but can cause
>>> also some wrong sacrifices in games.
>>
>>Hopefully, we do something right. I can assure you that I do not tune
>>towards test suites but rather towards standard game play. However,
>>I do use test suites and test positions to partly verify any changes.
>>
>>>Here is a test position from the game Yudasin-Junior5 when black almost went
>>>wrong by playing Bxh2+
>>>
>>>[D]r1b1k2r/1pqp1ppp/p1Nbp3/8/4P3/2N5/PPP2PPP/R1BQR1K1 b kq - 0 1
>>>
>>>Can your program avoid Bxh2+?
>>
>>If your FEN is correct, this is an easy position for
>>"DarkThought WCCC'99". It locks onto dxc6 almost
>>instantly and prefers it from iteration #5 onwards.
>>
>>=Ernst=
>
>My FEN is correct.
>I posted this position because part of the top programs have problems with this
>position.
>
>They seem to believe that king with no pawns is bad and ignore the fact that
>black has development problems.
>
>Junior5 can avoid Bxh2 but only at tournament time control and could fall into
>the trap at faster time control.
>
>Junior6a is better and does not fall into this trap even in blitz(because the
>value of the pawns is reduced) but it also cannot find some good sacrifices like
>the famous sacrifice of Junior against Nimzo in the last WCCC.
>
>Uri
This one is too easy. Here is my output (PII notebook, not very fast):
nss depth time score variation (1)
1 0.00 -0.59 1. ... Qxc6
1 0.01 ++ 1. ... Bxh2+!!
1 0.01 0.68 1. ... Bxh2+ 2. Kh1 dxc6
1-> 0.02 0.68 1. ... Bxh2+ 2. Kh1 dxc6
2 0.03 0.68 1. ... Bxh2+ 2. Kh1 dxc6
2-> 0.05 0.68 1. ... Bxh2+ 2. Kh1 dxc6
3 0.06 -- 1. ... Bxh2+
3 0.07 -0.95 1. ... Bxh2+ 2. Kh1 dxc6 3. g3
3 0.11 ++ 1. ... bxc6!!
3 0.12 -0.10 1. ... bxc6 2. Qh5 O-O
3 0.13 0.20 1. ... dxc6 2. f4 O-O
3-> 0.13 0.20 1. ... dxc6 2. f4 O-O
4 0.16 -0.02 1. ... dxc6 2. Qh5 O-O 3. Rd1
4-> 0.20 -0.02 1. ... dxc6 2. Qh5 O-O 3. Rd1
5 0.25 0.18 1. ... dxc6 2. Qh5 O-O 3. Bg5 f6
5-> 0.37 0.18 1. ... dxc6 2. Qh5 O-O 3. Bg5 f6
6 0.48 0.02 1. ... dxc6 2. Qh5 O-O 3. Rd1 Rd8 4.
Bg5
6-> 0.67 0.02 1. ... dxc6 2. Qh5 O-O 3. Rd1 Rd8 4.
Bg5
7 1.11 0.05 1. ... dxc6 2. Qh5 O-O 3. e5 Bb4 4.
Bg5 Bxc3 5. bxc3
7-> 1.37 0.05 1. ... dxc6 2. Qh5 O-O 3. e5 Bb4 4.
Bg5 Bxc3 5. bxc3
8 2.36 0.06 1. ... dxc6 2. Qh5 O-O 3. e5 Bb4 4.
Bd2 Rd8 5. Rad1
8-> 3.10 0.06 1. ... dxc6 2. Qh5 O-O 3. e5 Bb4 4.
Bd2 Rd8 5. Rad1
9 6.58 0.09 1. ... dxc6 2. Qh5 O-O 3. e5 Bb4 4.
Rd1 f6 5. Bf4 Rd8 6. Rxd8+ Qxd8
9-> 7.47 0.09 1. ... dxc6 2. Qh5 O-O 3. e5 Bb4 4.
Rd1 f6 5. Bf4 Rd8 6. Rxd8+ Qxd8
10 14.20 0.04 1. ... dxc6 2. Qh5 O-O 3. e5 Bb4 4.
Bd2 Rd8 5. Rad1 Bc5 6. Bf4
10-> 32.43 0.04 1. ... dxc6 2. Qh5 O-O 3. e5 Bb4 4.
Bd2 Rd8 5. Rad1 Bc5 6. Bf4
Here is one of many such games. White to move.
[Event "?"]
[Site "?"]
[Date "2000.05.18"]
[Round "?"]
[White "computer"]
[WhiteElo ""]
[White "Crafty"]
[BlackElo ""]
[Result "0-1"]
1. e4 e5 2. Bc4 Nf6 3. d3 c6 4. Qe2 Be7 5. Bb3 O-O 6. Nf3 d6
7. O-O Na6 8. Nc3 Nc5 9. Be3 Nxb3 10. axb3 Be6
Two moves are liked by most programs. Bxa7 or Rxa7;Rxa7;Bxa7...
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