Author: Dann Corbit
Date: 12:30:53 03/03/04
Go up one level in this thread
On March 03, 2004 at 06:04:29, Sune Fischer wrote:
>On March 03, 2004 at 04:18:30, Paul Byrne wrote:
>
>>Granted, it is not a terribly useful position, as it came from a wild 8 (pawns
>>start on 4th rank) game on ICC between 2 patzers. And a very short search will
>>get you a score of +10 to +15 and better in white's favor.
>>
>>It is, however, surprisingly tough to see the mate, and makes an interesting
>>test position...
>>
>>r1b3n1/6k1/1n6/pP3qPQ/2PP2p1/1p4b1/4B3/R1BK2NR w - - 0 15
>>
>>Guildenstern's normal search cannot see it here, while it's PN search gets it in
>>under 30 seconds on an athlon 2400+. The line the PN search produces is mate in
>>19, but is likely not optimal, as PN search is not terribly concerned with
>>winning in the least number of moves.
>>
>>So, what programs can see the win from here?
>
>Not mine, I get a +22 score though.
>
>How about this one from one of my recent games.
>I get a +13 score in a minute but no mate, I wonder if there is a mate
>within reach of any program?
>
>[D]r4rk1/ppqb1Nbp/2n3p1/8/3PN1P1/1BP1Q2P/PP6/R4RK1 w - - 0 23
Crafty output:
Crafty v19.11
White(1): st 999
search time set to 999.00.
White(1): hash 300M
hash table memory = 192M bytes.
White(1): setboard r4rk1/ppqb1Nbp/2n3p1/8/3PN1P1/1BP1Q2P/PP6/R4RK1 w - - 0 23
White(1): go
clearing hash tables
time surplus 0.00 time limit 16:39 (16:39)
depth time score variation (1)
5-> 0.24 5.28 1. Nd8+ Kh8 2. Rxf8+ Bxf8 3. Nf7+ Kg8
4. Nf6+ Kg7 5. Rf1 Bf5 6. Ne8+ Rxe8
7. Qxe8
6 0.40 5.55 1. Nd8+ Kh8 2. Rxf8+ Bxf8 3. Nf7+ Kg8
4. Nf6+ Kg7 5. Nxd7 Qxd7 6. Qh6+ Kf6
7. Rf1+ Ke7 8. Qxh7
6-> 0.96 5.55 1. Nd8+ Kh8 2. Rxf8+ Bxf8 3. Nf7+ Kg8
4. Nf6+ Kg7 5. Nxd7 Qxd7 6. Qh6+ Kf6
7. Rf1+ Ke7 8. Qxh7
7 1.12 ++ 1. Nd8+!!
7 1.42 9.36 1. Nd8+ Kh8 2. Rxf8+ Bxf8 3. Nf7+ Kg8
4. Nf6+ Kg7 5. Nxd7 Qxd7 6. Qh6+ Kf6
7. Rf1+ Ke7 8. Qe3+ Ne5 9. Nxe5
7-> 1.82 9.36 1. Nd8+ Kh8 2. Rxf8+ Bxf8 3. Nf7+ Kg8
4. Nf6+ Kg7 5. Nxd7 Qxd7 6. Qh6+ Kf6
7. Rf1+ Ke7 8. Qe3+ Ne5 9. Nxe5
8 2.24 ++ 1. Nd8+!!
8 3.33 11.06 1. Nd8+ Kh8 2. Rxf8+ Bxf8 3. Nf7+ Kg8
4. Nf6+ Kg7 5. Rf1 Bf5 6. Rxf5 Qxf7
7. Nh5+ gxh5 8. Rxf7+ Kg6 9. Qe4+ Kg5
10. Rxb7
8-> 4.65 11.06 1. Nd8+ Kh8 2. Rxf8+ Bxf8 3. Nf7+ Kg8
4. Nf6+ Kg7 5. Rf1 Bf5 6. Rxf5 Qxf7
7. Nh5+ gxh5 8. Rxf7+ Kg6 9. Qe4+ Kg5
10. Rxb7
9 7.03 11.12 1. Nd8+ Kh8 2. Rxf8+ Bxf8 3. Nf7+ Kg8
4. Nf6+ Kg7 5. Rf1 Bf5 6. Rxf5 Qxf7
7. Nh5+ gxh5 8. Rxf7+ Kh8 9. Rxb7 hxg4
10. hxg4
9-> 10.22 11.12 1. Nd8+ Kh8 2. Rxf8+ Bxf8 3. Nf7+ Kg8
4. Nf6+ Kg7 5. Rf1 Bf5 6. Rxf5 Qxf7
7. Nh5+ gxh5 8. Rxf7+ Kh8 9. Rxb7 hxg4
10. hxg4
10 12.71 ++ 1. Nd8+!!
10 52.77 13.58 1. Nd8+ Be6 2. Bxe6+ Kh8 3. Rxf8+ Bxf8
4. Nf7+ Qxf7 5. Bxf7 Bg7 6. Be6 Re8
7. Nd6 Re7 8. Rd1
10-> 1:01 13.58 1. Nd8+ Be6 2. Bxe6+ Kh8 3. Rxf8+ Bxf8
4. Nf7+ Qxf7 5. Bxf7 Bg7 6. Be6 Re8
7. Nd6 Re7 8. Rd1
11 1:33 13.60 1. Nd8+ Be6 2. Bxe6+ Kh8 3. Rxf8+ Bxf8
4. Nf7+ Qxf7 5. Bxf7 Bg7 6. Be6 Na5
7. Rd1 Re8 8. Nd6 Rf8
11-> 2:04 13.60 1. Nd8+ Be6 2. Bxe6+ Kh8 3. Rxf8+ Bxf8
4. Nf7+ Qxf7 5. Bxf7 Bg7 6. Be6 Na5
7. Rd1 Re8 8. Nd6 Rf8
12 3:44 13.97 1. Nd8+ Be6 2. Bxe6+ Kh8 3. Rxf8+ Bxf8
4. Nf7+ Qxf7 5. Bxf7 Bg7 6. Nd6 Rf8
7. Bd5 Nxd4 8. cxd4 b6 9. Rd1
12-> 4:59 13.97 1. Nd8+ Be6 2. Bxe6+ Kh8 3. Rxf8+ Bxf8
4. Nf7+ Qxf7 5. Bxf7 Bg7 6. Nd6 Rf8
7. Bd5 Nxd4 8. cxd4 b6 9. Rd1
13 10:20 14.08 1. Nd8+ Be6 2. Bxe6+ Kh8 3. Rxf8+ Bxf8
4. Nf7+ Qxf7 5. Bxf7 Bg7 6. Nd6 Rb8
7. Bd5 h5 8. gxh5 Bxd4 9. Nf7+ Kg8
10. Ne5+ Kg7 11. cxd4 gxh5
time=16:39 cpu=88% mat=2 n=506049970 fh=95% nps=506K
ext-> chk=35658412 cap=825892 pp=74446 1rep=2877392 mate=172995
predicted=0 nodes=506049970 evals=39811873 50move=0
endgame tablebase-> probes=0 hits=0
White(1): Nd8+
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