Author: Slater Wold
Date: 16:13:24 03/18/02
Go up one level in this thread
On March 18, 2002 at 16:43:18, Art Basham wrote:
>Here a good chess program will play d4-d5
>rather quickly...(making way for QXP check in the next move)!
>
>[D]r4rk1/pqpnnppp/1p2p3/8/3P4/2Q1PPB1/PP2NP1P/3R1KR1 w - -
>
>Nejmet, Pepito, Phalanx, & Tao_5 all found it rather quickly,
>but most of my engines loaded in the Chess Arena "failed the test"...etc!
Thanks for the position, it's actually helped me ponder something.
From Crafty 18.13 with SE:
White(1): setboard r4rk1/pqpnnppp/1p2p3/8/3P4/2Q1PPB1/PP2NP1P/3R1KR1 w - -
White(1): go
clearing hash tables
time surplus 0.00 time limit 1:00 (1:00)
nss depth time score variation (1)
starting thread 1
7 0.17 1.15 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nf5
4. Ng3 Nh4 5. Ke2 f6
(2) 7-> 0.32 1.15 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nf5
4. Ng3 Nh4 5. Ke2 f6
8 0.48 1.15 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nf5
4. Ng3 Nh4 5. Ke2 f6 <HT>
(4) 8-> 1.42 1.15 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nf5
4. Ng3 Nh4 5. Ke2 f6 <HT>
(3) 9 2.62 1.28 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nd5
4. Bd6 Rxc1+ 5. Nxc1 Rc8 6. Kg2 Rc6
7. Bg3
(3) 9-> 5.89 1.28 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nd5
4. Bd6 Rxc1+ 5. Nxc1 Rc8 6. Kg2 Rc6
7. Bg3
(2) 10 7.28 0.98 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nd5
4. Bd6 Rxc1+ 5. Nxc1 Rc8 6. Kg2 Rc6
7. Bg3 Rc2
(4) 10-> 29.89 0.98 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nd5
4. Bd6 Rxc1+ 5. Nxc1 Rc8 6. Kg2 Rc6
7. Bg3 Rc2
(3) 11 35.54 1.08 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nd5
4. Bd6 Rxc1+ 5. Nxc1 Rc8 6. Kg2 Rc6
7. Bg3 Rc2 8. Nd3
time=1:00 cpu=265% mat=0 n=85561890 fh=89% nps=1419k
ext-> chk=2305641 cap=248646 pp=66828 1rep=251236 mate=4105 sing=7
9
predicted=0 nodes=85561890 evals=0
endgame tablebase-> probes done=0 successful=0
hashing-> trans/ref=25% pawn=99% used=95%
SMP-> split=1727 stop=521 data=6/32 cpu=2:40 elap=1:00
The key being sing=79, where did they come from?
How about 3 minutes:
White(1): setboard r4rk1/pqpnnppp/1p2p3/8/3P4/2Q1PPB1/PP2NP1P/3R1KR1 w - -
White(1): go
clearing hash tables
time surplus 0.00 time limit 3:00 (3:00)
nss depth time score variation (1)
starting thread 1
7 0.15 1.15 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 f6
4. Kg2 Nf5 5. Nf4 e5 6. dxe5 fxe5
(2) 7-> 0.32 1.15 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 f6
4. Kg2 Nf5 5. Nf4 e5 6. dxe5 fxe5
8 0.48 1.15 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 f6
4. Kg2 Nf5 5. Nf4 e5 6. dxe5 fxe5 <HT>
(4) 8-> 1.43 1.15 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 f6
4. Kg2 Nf5 5. Nf4 e5 6. dxe5 fxe5 <HT>
(3) 9 2.68 1.28 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nd5
4. Bd6 Rxc1+ 5. Nxc1 Rc8 6. Kg2 Rc6
7. Bg3
(3) 9-> 6.82 1.28 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nd5
4. Bd6 Rxc1+ 5. Nxc1 Rc8 6. Kg2 Rc6
7. Bg3
(2) 10 8.45 0.98 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nd5
4. Bd6 Rxc1+ 5. Nxc1 Rc8 6. Kg2 Rc6
7. Bg3 Rc2
(4) 10-> 20.48 0.98 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nd5
4. Bd6 Rxc1+ 5. Nxc1 Rc8 6. Kg2 Rc6
7. Bg3 Rc2
(3) 11 25.50 0.78 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Bd6 Nf5
4. d5 exd5 5. Bb4 Rc4 6. Bc3 Rd8 7.
Rg5 g6 8. Rxd5
(2) 11 1:20 1.06 1. d5 f6 2. dxe6 Nc5 3. b4 Nxe6 4.
Qb3 Qc8 5. Nf4 Kf7 6. Nxe6 Qxe6 7.
Qxe6+ Kxe6 8. Bxc7
11-> 2:02 1.06 1. d5 f6 2. dxe6 Nc5 3. b4 Nxe6 4.
Qb3 Qc8 5. Nf4 Kf7 6. Nxe6 Qxe6 7.
Qxe6+ Kxe6 8. Bxc7
time=3:00 cpu=211% mat=0 n=258028024 fh=90% nps=1430k
ext-> chk=6705882 cap=855087 pp=343167 1rep=754212 mate=20715 sing
=111
predicted=0 nodes=258028024 evals=0
endgame tablebase-> probes done=0 successful=0
hashing-> trans/ref=25% pawn=99% used=99%
SMP-> split=2185 stop=638 data=7/32 cpu=6:20 elap=3:00
Seems those 79 extensions *mostly* came from the 11th ply.
And Crafty 18.13 (no SE):
White(1): setboard r4rk1/pqpnnppp/1p2p3/8/3P4/2Q1PPB1/PP2NP1P/3R1KR1 w - -
White(1): go
clearing hash tables
time surplus 0.00 time limit 3:00 (3:00)
nss depth time score variation (1)
starting thread 1
(3) 7-> 0.17 1.05 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nd5
4. Bd6 f6 5. Rxc8+ Rxc8
(2) 8 0.25 1.24 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 f6
4. Kg2 e5 5. Bd6
(2) 8-> 0.49 1.24 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 f6
4. Kg2 e5 5. Bd6
9 0.61 1.15 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 f6
4. Kg2 Nf5 5. Nf4 e5 6. dxe5 fxe5
(4) 9-> 1.19 1.15 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 f6
4. Kg2 Nf5 5. Nf4 e5 6. dxe5 fxe5
(3) 10 1.72 1.28 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nd5
4. Bd6 Rxc1+ 5. Nxc1 Rc8 6. Kg2 Rc6
7. Bg3
10-> 2.64 1.28 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nd5
4. Bd6 Rxc1+ 5. Nxc1 Rc8 6. Kg2 Rc6
7. Bg3
11 3.09 0.98 1. Qxc7 Qxc7 2. Bxc7 Rfc8 3. Rc1 Nd5
4. Bd6 Rxc1+ 5. Nxc1 Rc8 6. Kg2 Rc6
7. Bg3 Rc2
11 36.69 1.06 1. d5 f6 2. dxe6 Nc5 3. Qc4 Qxf3 4.
b4 Ne4 5. Qxc7 Nf5 6. Qc2
11-> 36.69 1.06 1. d5 f6 2. dxe6 Nc5 3. Qc4 Qxf3 4.
b4 Ne4 5. Qxc7 Nf5 6. Qc2
12 1:22 1.40 1. d5 g6 2. dxe6 Nc5 3. exf7+ Rxf7
4. b4 Ne6 5. Qe5 Qc6 6. b5 Qc2 7. Rd7
Qxa2
12-> 1:27 1.40 1. d5 g6 2. dxe6 Nc5 3. exf7+ Rxf7
4. b4 Ne6 5. Qe5 Qc6 6. b5 Qc2 7. Rd7
Qxa2
13 2:08 1.27 1. d5 g6 2. dxe6 Nc5 3. exf7+ Rxf7
4. b4 Na6 5. e4 Raf8 6. Kg2 Rxf3 7.
Qe5 Nc6 8. Qe6+ R3f7
13-> 2:33 1.27 1. d5 g6 2. dxe6 Nc5 3. exf7+ Rxf7
4. b4 Na6 5. e4 Raf8 6. Kg2 Rxf3 7.
Qe5 Nc6 8. Qe6+ R3f7
time=3:00 cpu=213% mat=0 n=275060819 fh=91% nps=1525k
ext-> chk=10128411 cap=695486 pp=344700 1rep=1007161 mate=51126
predicted=0 nodes=275060819 evals=0
endgame tablebase-> probes done=0 successful=0
hashing-> trans/ref=22% pawn=99% used=99%
SMP-> split=557 stop=102 data=7/32 cpu=6:25 elap=3:00
SE are expensive. :(
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