Author: Dann Corbit
Date: 13:51:48 01/28/02
Go up one level in this thread
On January 28, 2002 at 14:18:14, Gerd Isenberg wrote:
>From CCT4-10 IsiChessX - PostModernist 0-1
>
>Does your program avoid Qc8 ?
>
>[D] 6k1/4bppp/2p3n1/5Q2/1qPB4/1P1R1BP1/r6P/7K w - - am Qc8
>
>In this position after 34.Qc8+ Nf8, IsiChess failed even more with 35.Qxc6??
>
>[D] 2Q2nk1/4bppp/2p5/8/1qPB4/1P1R1BP1/r6P/7K w - - am Qxc6
>
>After 34.Qc8? Nf8 IsiChess got a FailLow with Qxc6 and a very bad search
>behaviour. The first one at depth 10 from +130 to +95 after 0:10, a second one
>at depth 13 after 1:45 resp. 2:06 from +106 ..via +65-- to -164. Few moments
>later, i got an exploding search tree looking for 35.Bc3.
>
>After 11:10 it came back with a score of -0.88 and after 18:18 it found Rd1 with
>-0.83. But unfortunally during the game, my maxTime exceeds (aprox. 3*averadge
>time), signaled the Search thread to terminate unconditionally after aprox. 8
>Minutes - and IsiChess played Qxc6??
>
>Seems that the FailLow behaviour of my Search needs some work, may be too many
>extensions, but the wrong. Also i have to think about interrupting the Search in
>these FailLow situations. Most often my branching factor seems OK, but sometimes
>these terrible exceptions.
>
>Very impressed of PostModernist 33...Qb4!
I wouldn't exactly hang my head over it if I were you. I think almost every
program will play it exactly like yours did. For example, look at this:
EPD Kit revision date: 1996.04.21
unable to open book file [e:\crafty\release/books.bin].
hash table memory = 48M bytes.
pawn hash table memory = 6M bytes.
EGTB cache memory = 32M bytes.
draw score set to 0.00 pawns.
choose from book moves randomly (using weights.)
choose from 5 best moves.
book learning enabled
result learning enabled
position learning enabled
threshold set to 9 pawns.
5 piece tablebase files found
19045kb of RAM used for TB indices and decompression tables
Crafty v18.13
White(1): st 999
search time set to 999.00.
White(1): epdpfga \qc8.epd qc8.out
PFGA: EPD record: 1
middle-game phase
clearing hash tables
time surplus 0.00 time limit 16:39 (16:39)
nss depth time score variation (1)
5 0.23 0.22 1. Bg1 c5 2. Bd5 Nh8 3. Be3
5-> 0.28 0.22 1. Bg1 c5 2. Bd5 Nh8 3. Be3
6 0.37 0.12 1. Bg1 Ra1 2. Qc8+ Bf8 3. Re3 c5 4.
Qf5
6 0.46 0.39 1. Qc8+ Bf8 2. Qe8 c5 3. Bd5 Ra7 4.
Be3
6-> 0.60 0.39 1. Qc8+ Bf8 2. Qe8 c5 3. Bd5 Ra7 4.
Be3
7 0.73 -- 1. Qc8+
7 1.18 -0.09 1. Qc8+ Bf8 2. Qe8 c5 3. Bd5 Nh8 4.
Bg1 Qa3 <HT>
7 1.63 0.10 1. Bg1 Ra1 2. Qc8+ Bf8 3. Qe8 Qb6 4.
Rd1 Rxd1 5. Bxd1
7-> 2.23 0.10 1. Bg1 Ra1 2. Qc8+ Bf8 3. Qe8 Qb6 4.
Rd1 Rxd1 5. Bxd1
8 2.62 -0.15 1. Bg1 Ra1 2. Qc8+ Bf8 3. Qe8 Re1 4.
Be4 Qc5 5. Rd4
8 3.39 0.19 1. Qc8+ Bf8 2. Qe8 c5 3. Bd5 Ra7 4.
Bb2 Re7 5. Qd8
8-> 5.15 0.19 1. Qc8+ Bf8 2. Qe8 c5 3. Bd5 Ra7 4.
Bb2 Re7 5. Qd8
9 6.10 0.35 1. Qc8+ Bf8 2. Qe8 c5 3. Bd5 Ra7 4.
Bf2 Nh8 5. Kg1 Ra1+ 6. Kg2
9-> 8.09 0.35 1. Qc8+ Bf8 2. Qe8 c5 3. Bd5 Ra7 4.
Bf2 Nh8 5. Kg1 Ra1+ 6. Kg2
10 12.56 0.71 1. Qc8+ Bf8 2. Qe8 Rc2 3. Bg1 Rc1 4.
Bd1 c5 5. Rd7 Nh8 6. Be3
10-> 16.02 0.71 1. Qc8+ Bf8 2. Qe8 Rc2 3. Bg1 Rc1 4.
Bd1 c5 5. Rd7 Nh8 6. Be3
11 24.52 0.64 1. Qc8+ Bf8 2. Qe8 c5 3. Bd5 Nh8 4.
Rf3 Ra7 5. Bc3 Qxb3 6. Qxf8+ Kxf8 7.
Bxg7+ Kxg7 8. Rxb3
11-> 38.92 0.64 1. Qc8+ Bf8 2. Qe8 c5 3. Bd5 Nh8 4.
Rf3 Ra7 5. Bc3 Qxb3 6. Qxf8+ Kxf8 7.
Bxg7+ Kxg7 8. Rxb3
12 52.23 0.41 1. Qc8+ Bf8 2. Qe8 c5 3. Bd5 Nh8 4.
Rf3 Ra7 5. Bf2 Ra1+ 6. Kg2 Ra7 7. Kg1
Ra1+ 8. Kg2
12-> 1:50 0.41 1. Qc8+ Bf8 2. Qe8 c5 3. Bd5 Nh8 4.
Rf3 Ra7 5. Bf2 Ra1+ 6. Kg2 Ra7 7. Kg1
Ra1+ 8. Kg2
13 4:58 -- 1. Qc8+
time=16:39 cpu=99% mat=0 n=603640638 fh=96% nps=604k
ext-> chk=49099535 cap=462815 pp=47294 1rep=4529141 mate=243482
predicted=0 nodes=603640638 evals=0
endgame tablebase-> probes done=0 successful=0
PFGA: EPD record: 2
time surplus 0.00 time limit 16:39 (16:39)
nss depth time score variation (1)
2 0.00 -Mat06 1. Bxc6 Qe1+ 2. Bg1 Ra1 3. Qxf8+ Kxf8
4. Rd8+ Bxd8 5. Kg2 Qf1+ 6. Kh1 Qxg1#
<HT>
2 0.02 -2.20 1. Qxc6 Qe1+ 2. Bg1 Ra1 3. Qb6 Qf1
4. Be4 Qe2 5. Bf5 Ra2 6. Qb7 <HT>
2 0.03 -0.43 1. Qf5 Qe1+ 2. Bg1 c5
2 0.04 -0.38 1. Qh3 Qe1+ 2. Bg1
2 0.04 -0.18 1. Re3 c5
6 0.35 -0.41 1. Qg4 Bf6 2. Bg1 c5 3. Bd5 Qe1
6-> 0.42 -0.41 1. Qg4 Bf6 2. Bg1 c5 3. Bd5 Qe1
7 0.47 -- 1. Qg4
7 0.84 -0.24 1. Qg4 Qe1+ 2. Bg1 Ra1 3. Qd4 c5 4.
Qe3 Qf1 5. Bd5
7-> 0.96 -0.24 1. Qg4 Qe1+ 2. Bg1 Ra1 3. Qd4 c5 4.
Qe3 Qf1 5. Bd5
8 0.99 -- 1. Qg4
8 1.45 -2.36 1. Qg4 Qe1+ 2. Bg1 Ra1 3. Qd4 Ne6 4.
Qe3 Qxe3 5. Rxe3 Bc5 6. Kg2 Bxe3 7.
Bxe3
8 2.25 -1.36 1. Rd1 c5 2. Ba1 Qxb3 3. Qg4 Ng6 4.
Qc8+ Bf8 5. Qg4
8 2.84 -1.32 1. Bc3 Qxb3 2. Qg4 <HT>
8-> 3.10 -1.32 1. Bc3 Qxb3 2. Qg4 <HT>
9 3.10 -1.32 1. Bc3 Qxb3 2. Qg4 <HT>
9-> 4.15 -1.32 1. Bc3 Qxb3 2. Qg4 <HT>
10 4.16 -1.32 1. Bc3 Qxb3 2. Qg4 <HT>
10 6.96 -1.10 1. Rd1 c5 2. Bg1 Qxb3 3. Qb7 Qxb7 4.
Bxb7 g6 5. h4 h6 6. Be3 Kg7
10-> 8.54 -1.10 1. Rd1 c5 2. Bg1 Qxb3 3. Qb7 Qxb7 4.
Bxb7 g6 5. h4 h6 6. Be3 Kg7
11 16.78 -1.10 1. Rd1 c5 2. Bg1 Qxb3 3. Qf5 g6 4.
Qe4 Ne6 5. Rb1 Qc3 6. Rb8+ Bf8 7. Be3
11-> 23.60 -1.10 1. Rd1 c5 2. Bg1 Qxb3 3. Qf5 g6 4.
Qe4 Ne6 5. Rb1 Qc3 6. Rb8+ Bf8 7. Be3
12 38.21 -1.00 1. Rd1 c5 2. Bg1 Qxb3 3. Qb7 Qc3 4.
Bd5 Qf6 5. Qc8 Ra1 6. Rxa1 Qxa1 7.
Qf5 Bf6 <HT>
12-> 1:03 -1.00 1. Rd1 c5 2. Bg1 Qxb3 3. Qb7 Qc3 4.
Bd5 Qf6 5. Qc8 Ra1 6. Rxa1 Qxa1 7.
Qf5 Bf6 <HT>
13 1:59 -1.00 1. Rd1 c5 2. Bg1 Qxb3 3. Qb7 Qc3 4.
Bd5 Qf6 5. Qc8 Ra1 6. Rxa1 Qxa1 7.
Qf5 Bf6 8. h3
13 4:06 ++ 1. Qxc6!!
13-> 5:13 -0.61 1. Qxc6
14 5:16 -- 1. Qxc6
14 7:25 -2.45 1. Qxc6 Qe1+ 2. Bg1 Ra1 3. Qb6 Qf1
4. Be4 Qe2 5. Bf5 g6 6. Qd4 gxf5 7.
Re3 Qf1 8. Qxa1 Qxa1 9. Rxe7
14 13:48 -0.97 1. Rd1 c5 2. Bg1 Qxb3 3. Qb7 Qc3 4.
Bd5 Qf6 5. Qc6 Qxc6 6. Bxc6 g6 7. h4
h6 8. Be3 Kg7
14-> 16:11 -0.97 1. Rd1 c5 2. Bg1 Qxb3 3. Qb7 Qc3 4.
Bd5 Qf6 5. Qc6 Qxc6 6. Bxc6 g6 7. h4
h6 8. Be3 Kg7
time=16:39 cpu=100% mat=0 n=540651496 fh=92% nps=541k
ext-> chk=24076432 cap=716616 pp=4652 1rep=2795371 mate=416776
predicted=0 nodes=540651496 evals=0
endgame tablebase-> probes done=0 successful=0
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