Author: Dann Corbit
Date: 12:25:03 11/13/01
Go up one level in this thread
On November 13, 2001 at 09:57:20, Jon Dart wrote:
>This occurred in a testgame, Yace vs. Arasan:
>
>[D] 8/4kp2/4p3/p2pP2n/Pp2nPp1/1P2P1P1/2K1N3/4B3 b - -
>
>Yace played f6! and won. The current released version of Arasan (5.4) takes a
>long time to find this. My latest development build takes about 25 seconds on an
>Athlon 1.3GHz. Crafty 18.10, however, selects it instantly and sticks to it.
>
>I haven't had time to analyze this yet. Is there some obvious piece of knowledge
>that makes the solution easy for some programs, hard for others?
Here is what the crafty output looks like, for those who have not run it to see
for themselves:
PFGA: EPD record: 1
end-game phase
clearing hash tables
time surplus 0.00 time limit 16:39 (16:39)
nss depth time score variation (1)
8-> 0.21 -0.22 1. ... f6 2. Nd4 Nhxg3 3. Bxg3 Nxg3
4. Nc6+ Kf7 5. exf6 Kxf6 6. Kd3 Ne4
7. Nxa5
9 0.35 -0.24 1. ... f6 2. Nd4 Nhxg3 3. Nc6+ Kf7
4. exf6 Nf5 5. Ne5+ Kxf6 6. Nxg4+ Ke7
7. Kd3
9-> 0.38 -0.24 1. ... f6 2. Nd4 Nhxg3 3. Nc6+ Kf7
4. exf6 Nf5 5. Ne5+ Kxf6 6. Nxg4+ Ke7
7. Kd3
10 0.73 -0.32 1. ... f6 2. Nd4 Nhxg3 3. Nc6+ Kf7
4. exf6 Nf5 5. Ne5+ Kxf6 6. Nxg4+ Ke7
7. Bd2 Kd6
10-> 0.77 -0.32 1. ... f6 2. Nd4 Nhxg3 3. Nc6+ Kf7
4. exf6 Nf5 5. Ne5+ Kxf6 6. Nxg4+ Ke7
7. Bd2 Kd6
11 1.96 -0.51 1. ... f6 2. Nd4 Nexg3 3. Nc6+ Kf7
4. exf6 Nf1 5. Kd3 g3 6. Kd4 g2 7.
Bf2 Nxf6 8. Nxa5
11-> 2.04 -0.51 1. ... f6 2. Nd4 Nexg3 3. Nc6+ Kf7
4. exf6 Nf1 5. Kd3 g3 6. Kd4 g2 7.
Bf2 Nxf6 8. Nxa5
12 4.77 -0.54 1. ... f6 2. exf6+ Kxf6 3. Kd1 Ng7
4. Nd4 Nf5 5. Nxf5 Kxf5 6. Kc2 e5 7.
fxe5 Ke6 8. Kd3 Kxe5
12-> 4.92 -0.54 1. ... f6 2. exf6+ Kxf6 3. Kd1 Ng7
4. Nd4 Nf5 5. Nxf5 Kxf5 6. Kc2 e5 7.
fxe5 Ke6 8. Kd3 Kxe5
13 7.00 -0.64 1. ... f6 2. exf6+ Kxf6 3. Kd1 Ng7
4. Nd4 Nf5 5. Nxf5 Kxf5 6. Kc2 e5 7.
Kd3 Ke6 8. fxe5 Kxe5 9. Ke2 Kf5 <HT>
13-> 7.31 -0.64 1. ... f6 2. exf6+ Kxf6 3. Kd1 Ng7
4. Nd4 Nf5 5. Nxf5 Kxf5 6. Kc2 e5 7.
Kd3 Ke6 8. fxe5 Kxe5 9. Ke2 Kf5 <HT>
14 13.06 -0.59 1. ... f6 2. exf6+ Kxf6 3. Kd3 Ng7
4. Nd4 Nf5 5. Nc6 Nc5+ 6. Kc2 Nxe3+
7. Kd2 Nf5 8. Nxa5 Nxg3 9. Kc2 Nge4
10. Bxb4
14 15.75 -0.71 1. ... Ng7 2. Nd4 Nf5 3. Nxf5+ exf5
4. Kd3 Nc5+ 5. Kc2 f6 6. exf6+ Kxf6
7. Bf2 Ke6 8. Be1 Kd6 9. Bf2 Ne4 10.
Be1 Kc5
14-> 16.22 -0.71 1. ... Ng7 2. Nd4 Nf5 3. Nxf5+ exf5
4. Kd3 Nc5+ 5. Kc2 f6 6. exf6+ Kxf6
7. Bf2 Ke6 8. Be1 Kd6 9. Bf2 Ne4 10.
Be1 Kc5
15 22.58 -0.59 1. ... Ng7 2. Nd4 Nh5 3. Ne2 f6 4.
exf6+ Kxf6 5. Kd3 <HT>
15 45.19 -1.01 1. ... f6 2. exf6+ Kxf6 3. Kd3 Nc5+
4. Kc2 Ng7 5. Nd4 Nf5 6. Nxf5 Kxf5
7. Bd2 Ne4 8. Be1 <HT>
15-> 45.98 -1.01 1. ... f6 2. exf6+ Kxf6 3. Kd3 Nc5+
4. Kc2 Ng7 5. Nd4 Nf5 6. Nxf5 Kxf5
7. Bd2 Ne4 8. Be1 <HT>
16 1:12 -0.94 1. ... f6 2. exf6+ Kxf6 3. Kb2 Ng7
4. Nd4 Nf5 5. Nc6 Nxe3 6. Nxa5 Ng2
7. Bxb4 Nxg3 8. Nc6 Nxf4 9. Bc3+ Kf5
10. Nd4+ Ke4 11. b4
16-> 1:16 -0.94 1. ... f6 2. exf6+ Kxf6 3. Kb2 Ng7
4. Nd4 Nf5 5. Nc6 Nxe3 6. Nxa5 Ng2
7. Bxb4 Nxg3 8. Nc6 Nxf4 9. Bc3+ Kf5
10. Nd4+ Ke4 11. b4
17 2:42 -1.32 1. ... f6 2. exf6+ Kxf6 3. Kb2 Ng7
4. Nd4 Nf5 5. Nxf5 Kxf5 6. Kc2 Nc5
<HT>
17-> 2:47 -1.32 1. ... f6 2. exf6+ Kxf6 3. Kb2 Ng7
4. Nd4 Nf5 5. Nxf5 Kxf5 6. Kc2 Nc5
<HT>
18 9:49 ++ 1. ... f6!!
18-> 11:32 -1.71 1. ... f6 2. exf6+ Kxf6 3. Kb2 Ng7
4. Nd4 Nf5 5. Nxf5 Kxf5 6. Kc2 Nc5
<HT>
time=16:39 cpu=100% mat=0 n=588986251 fh=88% nps=589k
ext-> chk=22138301 cap=1825163 pp=3242847 1rep=426470 mate=8088
predicted=0 nodes=588986251 evals=156065983
endgame tablebase-> probes done=0 successful=0
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