Author: Dave Gomboc
Date: 01:34:48 05/22/99
Go up one level in this thread
On May 21, 1999 at 21:40:57, Dave Gomboc wrote:
>First, the (famous) game.
>
>Glucksberg - Najdorf, Warsaw 1935.
>
>1.d4 d5 2.c4 e6 3.Nc3 c6 4.e3 f5 5.Nf3 Nf6 6.Bd3 Bd6 7.O-O O-O 8.Ne2 Nbd7 9.Ng5
>Bxh2+ 10.Kh1 Ng4 11.f4 Qe8 12.g3 Qh5 13.Kg2 Bg1 14.Nxg1 Qh2+ 15.Kf3 e5 16.dxe5
>Ndxe5+ 17.fxe5 Nxe5+ 18.Kf4 Ng6+ 19.Kf3 f4 20.exf4 Bg4+ 21.Kxg4 Ne5+ 22.fxe5 h5#
>
>Now for the questions:
>
>How long does it take for programs to...
>
>1) decide to play 15...e5!
>
>2) assess 15...e5! as about +4 for Black (roughly the score if White had played
>21.Ke3 and dropped his queen. The interpolation of 16.cxd5 cxd5 doesn't
>substantially change matters.)
>
>3) decide to play 13...Bg1! (it's better than ...Bxg3)
>
>4) assess 13...Bg1! as about +2 for Black (up two pawns).
>
>Dave
I just went for "the big enchilada" and skipped over 1 and 2 for now. I cleared
out position.bin and position.lrn, and set Crafty thinking on Black's 13th move.
Here's what I get on my dual PII-300:
max threads set to 2
display PV each time it changes.
display extended statistics at end of each search.
clearing hash tables
display move numbers in variations.
display ply-1 moves as they are searched.
display statistics at end of each search.
display time for moves played in game.
display PV at end of each iteration.
hash table memory = 48M bytes.
Crafty v16.6 (2 cpus)
White(1): hashp 4Mponder off
pawn hash table memory = 4M bytes.
White(1): ponder off
pondering disabled.
White(1): setboard r1b2rk1/pp1n2pp/2p1p3/3p1pNq/2PP1Pn1/3BP1P1/PP2N1Kb/R1BQ1R2 b
- -
+---+---+---+---+---+---+---+---+
8 | *R| | *B| | | *R| *K| |
+---+---+---+---+---+---+---+---+
7 | *P| *P| | *N| | | *P| *P|
+---+---+---+---+---+---+---+---+
6 | | | *P| | *P| | | |
+---+---+---+---+---+---+---+---+
5 | | | | *P| | *P| N | *Q|
+---+---+---+---+---+---+---+---+
4 | | | P | P | | P | *N| |
+---+---+---+---+---+---+---+---+
3 | | | | B | P | | P | |
+---+---+---+---+---+---+---+---+
2 | P | P | | | N | | K | *B|
+---+---+---+---+---+---+---+---+
1 | R | | B | Q | | R | | |
+---+---+---+---+---+---+---+---+
a b c d e f g h
Black(1): display
Black(1): help
Black(1): analyze
clearing hash tables
time surplus 0.00 time limit 30.00 (3:00)
depth time score variation (1)
starting thread 1
4-> 0.15 -0.39 1. ... Ndf6 2. c5 b6 3. cxb6 axb6
5 0.18 -0.46 1. ... Ndf6 2. c5 h6 3. Nf3 Ne4
5-> 0.40 -0.46 1. ... Ndf6 2. c5 h6 3. Nf3 Ne4
6 0.70 -0.36 1. ... Ndf6 2. Rh1 Ne4 3. Bxe4 fxe4
4. c5 Rf5
6 1.00 -0.19 1. ... Bg1 2. Nxg1 Qh2+ 3. Kf3 Qh1+
4. Ke2 Qg2+ 5. Ke1 Nh2 6. N1f3 Nxf1
7. Bxf1 Qxg3+
6-> 1.15 -0.19 1. ... Bg1 2. Nxg1 Qh2+ 3. Kf3 Qh1+
4. Ke2 Qg2+ 5. Ke1 Nh2 6. N1f3 Nxf1
7. Bxf1 Qxg3+
7 1.54 -0.02 1. ... Bg1 2. Nxg1 Qh2+ 3. Kf3 e5 4.
cxd5 e4+ 5. Nxe4 fxe4+ 6. Kxe4 Nf2+
7. Rxf2 Qxf2 8. dxc6 bxc6
7 3.54 0.04 1. ... e5 2. Rh1 e4 3. Bc2 dxc4 4.
Ne6 Rf6
7-> 4.14 0.04 1. ... e5 2. Rh1 e4 3. Bc2 dxc4 4.
Ne6 Rf6
8 6.29 -0.07 1. ... e5 2. Rh1 e4 3. Bc2 dxc4 4.
Nh3 Nxe3+ 5. Bxe3 Qf3+ 6. Kxh2 Qxe3
8 8.03 0.00 1. ... Bg1 2. Nxg1 Qh2+ 3. Kf3 e5 4.
fxe5 Ndxe5+ 5. dxe5 Nxe5+ 6. Kf4 Ng6+
7. Kf3 Ne5+
[Crafty sees the correct line of play, but doesn't notice the crushing ...f4!,
and so it eventually moves on to something else. --Dave]
8-> 9.67 0.00 1. ... Bg1 2. Nxg1 Qh2+ 3. Kf3 e5 4.
fxe5 Ndxe5+ 5. dxe5 Nxe5+ 6. Kf4 Ng6+
7. Kf3 Ne5+
9 11.67 0.00 1. ... Bg1 2. Nxg1 Qh2+ 3. Kf3 e5 4.
fxe5 Ndxe5+ 5. dxe5 Nxe5+ 6. Kf4 Ng6+
7. Kf3 Ne5+
9 31.65 0.07 1. ... e5 2. cxd5 Bg1 3. Nf3 Bxe3 4.
dxc6 Bxc1 5. Bc4+ Kh8 6. Rxc1
9 45.23 ++ 1. ... Bxg3!!
9-> 48.03 0.46 1. ... Bxg3
10 1:05 ++ 1. ... Bxg3!!
10-> 1:16 0.85 1. ... Bxg3
11 2:03 -- 1. ... Bxg3
11 2:19 0.37 1. ... Bxg3 2. Rh1 Bh2 3. cxd5 Ndf6
4. Nf3 Nxd5 5. Qb3 Rd8 6. Nxh2 Ndxe3+
7. Bxe3 Nxe3+
11-> 3:27 0.37 1. ... Bxg3 2. Rh1 Bh2 3. cxd5 Ndf6
4. Nf3 Nxd5 5. Qb3 Rd8 6. Nxh2 Ndxe3+
7. Bxe3 Nxe3+
12 4:57 0.54 1. ... Bxg3 2. Rh1 Bh2 3. cxd5 Ndf6
4. Nf3 Nxd5 5. Qb3 Qg6 6. Rxh2 Ngxe3+
7. Kh1 Qg4
12-> 9:01 0.54 1. ... Bxg3 2. Rh1 Bh2 3. cxd5 Ndf6
4. Nf3 Nxd5 5. Qb3 Qg6 6. Rxh2 Ngxe3+
7. Kh1 Qg4
13 10:32 -- 1. ... Bxg3
13 15:36 0.00 1. ... Bxg3 2. Rh1 Bh2 3. Nf3 dxc4
4. Bxc4 Nb6 5. Bb3 Qg6 6. Nh4 Qh5 7.
Nf3
13 21:31 ++ 1. ... Bg1!!
[Crafty will play Bg1 from this point, but doesn't see the big win yet. --Dave]
13 26:48 0.52 1. ... Bg1 2. Nxg1 Qh2+ 3. Kf3 e5 4.
cxd5 e4+ 5. Bxe4 fxe4+ 6. Kxe4 Nf2+
7. Rxf2 Qxf2 8. dxc6 bxc6 9. Kd3 Qxg3
10. Kc2 Ba6
13-> 36:09 0.52 1. ... Bg1 2. Nxg1 Qh2+ 3. Kf3 e5 4.
cxd5 e4+ 5. Bxe4 fxe4+ 6. Kxe4 Nf2+
7. Rxf2 Qxf2 8. dxc6 bxc6 9. Kd3 Qxg3
10. Kc2 Ba6
14 57:24 0.66 1. ... Bg1 2. Nxg1 Qh2+ 3. Kf3 e5 4.
cxd5 e4+ 5. Bxe4 fxe4+ 6. Kxe4 Nf2+
7. Rxf2 Qxf2 8. d6 h6 9. N5h3 Qxg3
10. Qb3+ Rf7 11. Qe6
Black(0): exit
Black(1): quit
execution complete.
An hour was long enough, the hash table was probably swamped. I will try to
double it in size to 96M and run it overnight.
Dave
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