Author: Dann Corbit
Date: 20:02:03 04/18/02
Go up one level in this thread
On April 18, 2002 at 21:42:00, Slater Wold wrote:
>On April 18, 2002 at 21:41:00, John Merlino wrote:
>
>>On April 18, 2002 at 19:41:40, Gian-Carlo Pascutto wrote:
>>
>>>[D]5N2/2n5/7k/5Pp1/ppr5/4B3/Pb4PP/3R2K1 w - g6 0 2
>>>
>>>White can play fxg6 e.p and *check*.
>>>
>>>My program has been broken on this kind of position, for, eh,
>>>forever probably.
>>>
>>>--
>>>GCP
>>
>>Chessmaster has no problem reading this from the FEN string -- but is it the
>>best move? CM likes Rd7 better (this is on a PIII-600):
>>
>>Time Depth Score Positions Moves
>>0:00 1/3 2.15 1421 2.fxg6ep+ Kg7 3.Rf1 Nd5 4.Rf7+ Kg8
>>0:00 1/4 2.20 4612 2.fxg6ep+ Kg7 3.Rf1 Kh8 4.Rf4
>>0:00 2/5 1.94 21920 2.fxg6ep+ Kg7 3.Nd7 b3 4.Nb6 bxa2
>> 5.Nxc4 a1=Q 6.Rxa1 Bxa1
>>0:01 2/6 1.60 77361 2.fxg6ep+ Kg7 3.Nd7 a3 4.Rd6 b3
>> 5.axb3 a2
>>0:02 2/6 2.36 140511 2.Rd7 Bg7 3.Rd6+ Kh5 4.Rg6 Bh6
>> 5.Nh7 Nd5 6.Bxg5 Bxg5 7.Rxg5+ Kh6
>>0:05 3/7 1.57 404261 2.Rd7 Bg7 3.Rd6+ Kh5 4.Rg6 Bh6
>> 5.Nh7 Nd5 6.g3 Rg4 7.Nf6+ Nxf6
>> 8.Rxf6
>>0:09 3/7 2.16 749496 2.Rd6+ Kg7 3.Nd7 Nb5 4.Rg6+ Kf7
>> 5.Bxg5 Bd4+ 6.Kh1 Rc2
>>0:17 4/8 2.10 1542044 2.Rd6+ Kg7 3.Nd7 Nb5 4.Rb6 Bd4
>> 5.Bxd4+ Rxd4 6.f6+ Kh7 7.Rxb5 Rxd7
>> 8.Rxg5
>>1:15 5/9 1.69 6784439 2.Rd6+ Kg7 3.Nd7 Rc2 4.Nc5 Be5
>> 5.Rd7+ Kh6 6.Nd3 Rxa2 7.Nxe5 Rc2
>>1:45 5/9 2.64 9651621 2.Rd7 Bg7 3.Rd6+ Kh5 4.Rg6 Bd4
>> 5.Rxg5+ Kh6 6.Rg6+ Kh5 7.Bxd4 Rxd4
>> 8.Rg7 Ne8 9.Rd7 Rf4 10.Rh7+ Kg5
>>4:12 6/10 2.73 24186568 2.Rd7 Bg7 3.Rd6+ Kh5 4.Rg6 Bd4
>> 5.Rxg5+ Kh6 6.Rg6+ Kh5 7.Bxd4 Rxd4
>> 8.Rg7 Ne8 9.Rd7 Nd6 10.Ne6 Rd2
>> 11.Rh7+ Kg4
>>
>>jm
>
>
>So does Fritz 7.
Rd6+ also looks promising. Since there does not seem to be a large separation
in value, I think a deep search would be needed to be sure which choice is best.
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 v18.14
White(1): hash 300M
hash table memory = 192M bytes.
White(1): st 99
search time set to 99.00.
White(1): epdpfga \fxg6.epd
White(1): epdpfga \fxg6.epd t.out
PFGA: EPD record: 1
end-game phase
clearing hash tables
time surplus 0.00 time limit 1:39 (1:39)
nss depth time score variation (1)
6 0.39 2.45 1. Rd6+ Kg7 2. Nd7 g4 3. Nb6 Rc2 4.
Nxa4
6-> 0.44 2.45 1. Rd6+ Kg7 2. Nd7 g4 3. Nb6 Rc2 4.
Nxa4
7 0.58 2.32 1. Rd6+ Kg7 2. Nd7 g4 3. Nb6 Rc2 4.
Bh6+ Kf7 5. Nxa4
7 0.75 2.34 1. fxg6+ Kg7 2. Rf1 Bf6 3. Bh6+ Kxh6
4. Rxf6 Rc1+ 5. Rf1 Rxf1+ 6. Kxf1 Kg7
7-> 0.94 2.34 1. fxg6+ Kg7 2. Rf1 Bf6 3. Bh6+ Kxh6
4. Rxf6 Rc1+ 5. Rf1 Rxf1+ 6. Kxf1 Kg7
8 1.43 2.16 1. fxg6+ Kg7 2. Rf1 Bf6 3. Nd7 Nd5
4. Rf5 Nxe3 5. Rxf6
8 2.26 2.28 1. Rd6+ Kh5 2. Rg6 Bc1 3. Rxg5+ Kh6
4. Rg6+ Kh5 5. Bb6 Nd5 6. Nd7 Rc2
8 3.79 2.63 1. Rd7 Bg7 2. Rd6+ Kh5 3. Rg6 Bh6 4.
Nh7 Nd5 5. Bxg5 Bxg5 6. Nxg5
8-> 4.04 2.63 1. Rd7 Bg7 2. Rd6+ Kh5 3. Rg6 Bh6 4.
Nh7 Nd5 5. Bxg5 Bxg5 6. Nxg5
9 4.87 2.30 1. Rd7 Bg7 2. Rd6+ Kh5 3. Rg6 Bh6 4.
Nh7 Nd5 5. Bxg5 Bxg5 6. Nxg5 Nf6
9 8.87 2.33 1. Rd6+ Kg7 2. Nd7 Nb5 3. Rb6 Nc7 4.
Rg6+ Kf7 5. Nb6 Rc2 6. Bxg5 <HT>
9-> 13.11 2.33 1. Rd6+ Kg7 2. Nd7 Nb5 3. Rb6 Nc7 4.
Rg6+ Kf7 5. Nb6 Rc2 6. Bxg5 <HT>
10 16.63 2.42 1. Rd6+ Kg7 2. Nd7 Nb5 3. Rb6 Nc7 4.
Rb7 Bf6 5. Nc5 Be5 6. Nxa4
10 25.48 ++ 1. Rd7!!
10 42.06 3.00 1. Rd7 Bg7 2. Rd6+ Kh5 3. Rg6 Bh6 4.
Nh7 Nd5 5. Bxg5 Bxg5 6. Rxg5+ Kh4 7.
f6
10-> 43.25 3.00 1. Rd7 Bg7 2. Rd6+ Kh5 3. Rg6 Bh6 4.
Nh7 Nd5 5. Bxg5 Bxg5 6. Rxg5+ Kh4 7.
f6
11 49.52 2.71 1. Rd7 Bg7 2. Rd6+ Kh5 3. Rg6 Bd4 4.
Rxg5+ Kh6 5. Rg6+ Kh5 6. Bxd4 Rxd4
7. Ne6 Rd1+ 8. Kf2 Nxe6 9. Rxe6 b3
10. Re2 bxa2 11. Rxa2
11-> 1:00 2.71 1. Rd7 Bg7 2. Rd6+ Kh5 3. Rg6 Bd4 4.
Rxg5+ Kh6 5. Rg6+ Kh5 6. Bxd4 Rxd4
7. Ne6 Rd1+ 8. Kf2 Nxe6 9. Rxe6 b3
10. Re2 bxa2 11. Rxa2
12 1:11 2.71 1. Rd7 Bg7 2. Rd6+ Kh5 3. Rg6 Bd4 4.
Rxg5+ Kh6 5. Rg6+ Kh5 6. Bxd4 Rxd4
7. Ne6 Rd1+ 8. Kf2 Nxe6 9. Rxe6 Rh1
10. h3 Rh2
12-> 1:38 2.71 1. Rd7 Bg7 2. Rd6+ Kh5 3. Rg6 Bd4 4.
Rxg5+ Kh6 5. Rg6+ Kh5 6. Bxd4 Rxd4
7. Ne6 Rd1+ 8. Kf2 Nxe6 9. Rxe6 Rh1
10. h3 Rh2
time=1:39 cpu=99% mat=1 n=56723496 fh=92% nps=570k
ext-> chk=2645350 cap=131586 pp=305851 1rep=158131 mate=29176
predicted=0 nodes=56723496 evals=14850041
endgame tablebase-> probes done=0 successful=0
White(1): st 999
search time set to 999.00.
White(1): epdpfga \fxg6.epd t7.out
PFGA: EPD record: 1
time surplus 0.00 time limit 16:39 (16:39)
nss depth time score variation (1)
13 57.69 2.74 1. Rd7 Bg7 2. Rd6+ Kh5 3. Rg6 Bd4 4.
Rxg5+ <HT>
13-> 4:00 2.74 1. Rd7 Bg7 2. Rd6+ Kh5 3. Rg6 Bd4 4.
Rxg5+ <HT>
14 5:50 2.65 1. Rd7 Bg7 2. Rd6+ Kh5 3. Rg6 Bd4 4.
Rxg5+ Kh6 5. Rg6+ Kh5 6. Bxd4 Rxd4
7. Nh7 Nd5 8. Rd6 Nc3 9. Rxd4 Ne2+
10. Kf2 Nxd4
14-> 10:56 2.65 1. Rd7 Bg7 2. Rd6+ Kh5 3. Rg6 Bd4 4.
Rxg5+ Kh6 5. Rg6+ Kh5 6. Bxd4 Rxd4
7. Nh7 Nd5 8. Rd6 Nc3 9. Rxd4 Ne2+
10. Kf2 Nxd4
15 14:24 2.66 1. Rd7 Bg7 2. Rd6+ Kh5 3. Rg6 Nd5 4.
Rxg5+ Kh6 5. Rg6+ Kh5 6. Ne6 Nxe3 7.
Nxg7+ Kh4 8. g3+ Kh3 9. Rh6+ Kg4 10.
Kf2 Nd1+ 11. Ke1 Nb2 12. Rh4+ Kg5 13.
Rxc4 Nxc4 14. h3
time=16:39 cpu=99% mat=1 n=535358862 fh=90% nps=535k
ext-> chk=25890849 cap=1073764 pp=2117573 1rep=1313675 mate=112765
predicted=0 nodes=535358862 evals=246344864
endgame tablebase-> probes done=0 successful=0
White(1): quit
execution complete.
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