Author: Tim Foden
Date: 10:48:41 12/05/03
Go up one level in this thread
On December 05, 2003 at 11:38:25, Tord Romstad wrote:
>On December 04, 2003 at 13:37:47, Leen Ammeraal wrote:
>
>>Do you mean that most engines crash when dealing with
>>this position? If so, I don't see why. My engine Queen does not.
>
>Gothmog also doesn't crash, but it needs more than 10 seconds to
>complete a 1-ply search! I have been waiting several minutes for the second
>iteration to complete.
>
>Perhaps positions like this could even be useful, in order to find ways to
>reduce the number of qsearch nodes.
>
>Tord
When Leonid was always posting positions like these as checkmate problems I
changed GLC to have a hard q-search depth limit equal to the current iteration
depth, or a minimum of 4 ply. It lets GLC get to a better depth at least.
The other thing I did was order moves initially to put the checking moves first
(if any).
For this position...
Game stage: Opening
Current eval: -0.325
Ply Time Score Nodes Principal variation
2 0.030 +10.003 12308 Rxg8+ Qhxg8 2. Qxh6+ Qfxh6 3. Bxb8 Qxa5 4. Rxa5
Qxd1 5. Qbxd1
2 0.030 +10.003 14964 Rxg8+ Qhxg8 2. Qxh6+ Qfxh6 3. Bxb8 Qxa5 4. Rxa5
Qxd1 5. Qbxd1
3 0.150 +9.603 100941 Rxg8+ {--} Qfxg8 2. Rxh6 Q7xh6
3 0.170 +8.981 106082 Rxg8+ Qfxg8 2. Rxh6 Q7xh6 3. Qxe8 Rxa3
3 0.230 +8.981 134445 Rxg8+ Qfxg8 2. Rxh6 Q7xh6 3. Qxe8 Rxa3
4 0.290 +8.581 165026 Rxg8+ {--} Qfxg8 2. Rxh6 Rxb1+ 3. Kxb1 Q7xh6
4 0.461 +4.486 252559 Rxg8+ Qfxg8 2. Rxh6 Rxb1+ 3. Qaxb1 Q5xh6 4. Qxh6
Rxa3+
4 1.122 +4.487 602809 Bxb8 Bxg1 2. Rxh6 Qfxh6 3. Qxh6 Rxa3
4 2.173 +5.070 1165753 Qxc8 Rxb1+ 2. Kxb1 Qxd1+ 3. Qaxd1 Qxc8 4. Qaxf8
Qgxf8 5. Qxh4
4 2.183 +5.070 1166659 Qxc8 Rxb1+ 2. Kxb1 Qxd1+ 3. Qaxd1 Qxc8 4. Qaxf8
Qgxf8 5. Qxh4
5 2.203 +4.670 1185528 Qxc8 {--} Rxb1+ 2. Kxb1 Qxd1+ 3. Qaxd1 Qxc8 4.
Qaxf8 Qgxf8 5. Qxh4 Rxh4
5 3.195 +0.240 1952314 Qxc8 Rxb1+ 2. Qdxb1 Rxa3 3. Rxg8+ Qfxg8 4. Qxe8
Qgxe8
5 8.502 +2.450 5302137 Bxb8 Qhxc1 2. Rxg8+ Qhxg8 3. Qdxc1 Nb3+ 4. Qa4xb3
Qxa5 5. Qaxf8 Rxb3 6. Qaxa5 Rxb1+
5 9.384 +4.532 5872111 Rxg8+ Qfxg8 2. Rxh6 Rxb1+ 3. Qcxb1 Q7xh6 4. Qf6+
Qdxf6 5. Nexf6 Qxe1 6. Qxh5 Qexh5 7. Qbxe1
5 12.628 +4.671 7990534 Rxh6 {++} Qfxh6 2. Rxg8+ Kxg8 3. Bxb8 Qhxc1 4.
Qbxc1
5 13.780 +4.866 8635169 Rxh6 Rxb1+ 2. Qcxb1 Qfxh6 3. Qxd8 Qexd8 4. Qxh5
Rxa3 5. Rxg8+ Qdxg8 6. Qexh4 Rxa2+
5 19.047 +4.866 12109k Rxh6 Rxb1+ 2. Qcxb1 Qfxh6 3. Qxd8 Qexd8 4. Qxh5
Rxa3 5. Rxg8+ Qdxg8 6. Qexh4 Rxa2+
6 37.534 +4.489 21484k Rxh6 Rxb1+ 2. Kxb1 Qfxh6 3. Qxd8 Qexd8 4. Qxc8
Qxc8 5. Rxg8+ Kxg8 6. Qxh5 Rxa3 7. Qhxh4 Rxa2 8.
Qxh6 Rxa4
Analyse>exit
local: t=1:46.21 nps=571522.4 n=60703106 (2.1% / 97.9%)
total: t=1:46.21 nps=571522.4 n=60703106
stats: fh=96.9%/1.14%/0.674% draws=10
trans: probes=1282039 hits=229767 (17.92%) draft=163348 (12.74%)
tcuts: exact=45 (0.00%) upper=42875 (3.34%) lower=27595 (2.15%)
tstor: exact=200 (0.02%) upper=879923 (82.52%) lower=186147 (17.46%)
ehash: probes=0 hits=0 (-1.$%)
ext: check=880569 recap=130417 ppush=0 1rep=2941 thrt=0
q-moves: gen=412196422 tested=56938639 made/un=49633427 max-dep=6
max eval diff: part-1=2.723 part-2=5.610
Cheers, Tim.
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