Author: Dann Corbit
Date: 13:30:05 03/27/00
Go up one level in this thread
On March 27, 2000 at 07:41:33, Josh Strayhorn wrote:
>[D]2k4r/1pp2p2/p2q2p1/Q2Pbp1p/6b1/2NB3P/PPP2PP1/4R2K w - - 0 0
>
>How long does it take your program to find Nb5 here?
>
>I imagine that most programs would probably prefer other moves initially, for
>instance f3.
>
>By the way, the proper continuation is 1. Nb5!! Qf6 2. Rxe5! Qxe5 3. d6!
Amy started with that one then found what may be a better continuation...
White(1): level 40/240
Timecontrol is 40 moves in 240 mins
White(1): test epd.epd
Problem 1:
+---+---+---+---+---+---+---+---+
8 | | |*K*| | | | |*R*|
+---+---+---+---+---+---+---+---+
7 | |*P*|*P*| | |*P*| | | Hashkey: 4dc26b9e
+---+---+---+---+---+---+---+---+
6 |*P*| | |*Q*| | |*P*| |
+---+---+---+---+---+---+---+---+
5 | Q | | | P |*B*|*P*| |*P*| Black (27000, 20000) P.BRQ
+---+---+---+---+---+---+---+---+
4 | | | | | | |*B*| | White (27000, 20000) PNBRQ
+---+---+---+---+---+---+---+---+
3 | | | N | B | | | | P |
+---+---+---+---+---+---+---+---+
2 | P | P | P | | | P | P | | Index: 63
+---+---+---+---+---+---+---+---+
1 | | | | | R | | | K | MateThreat: 0 0
+---+---+---+---+---+---+---+---+
a b c d e f g h
TC: 40 moves in 14400 secs
TL: 315/1260
GamePhase: Middlegame
It Time Score principal Variation
6 1.6 +2.768 1. Kg1 Bxh3 2. gxh3 Kb8 3. Bc4 Re8 4. Qa4 Re7
7 1.7 +2.768 1. Kg1 Bxh3 2. gxh3 Kb8 3. Bc4 Re8 4. Qa4 Re7
7 2.5 +2.768 1. Kg1 Bxh3 2. gxh3 Kb8 3. Bc4 Re8 4. Qa4 Re7
8 2.6 +2.768 1. Kg1 Bxh3 2. gxh3 Kb8 3. Bc4 Re8 4. Qa4 Re7
8 7.4 +2.768 1. Kg1 Bxh3 2. gxh3 Kb8 3. Bc4 Re8 4. Qa4 Re7
9 16.7 +2.768 1. Kg1 Kb8 2. Kf1 Bxh3 3. gxh3 Rd8 4. Bc4 Re8 5. Kg2
9 21.4 +2.768 1. Kg1 Kb8 2. Kf1 Bxh3 3. gxh3 Rd8 4. Bc4 Re8 5. Kg2
10 45.9 --- 1. Kg1
10 55.6 +2.288 1. Kg1 Bxh3 2. gxh3 Bd4 3. Kg2 Rd8 4. Bc4 Bxf2 5. Kxf2
Qf4+
10 1:35 +++ 1. Nb5
10 1:53 +2.512 1. Nb5 Qf6 2. Rxe5 Qxe5 3. d6 Kb8 4. Qxc7+ Ka8 5. Qc3
Qxc3 6. Nxc3 Re8
10 2:57 +2.512 1. Nb5 Qf6 2. Rxe5 Qxe5 3. d6 Kb8 4. Qxc7+ Ka8 5. Qc3
Qxc3 6. Nxc3 Re8
11 3:13 +++ 1. Nb5
11 3:29 +2.784 1. Nb5 axb5 2. Qa8+ Kd7 3. Bxb5+ c6 4. Qxb7+ Kd8 5. Qa8+
Qb8 6. Qxb8+ Bxb8 7. dxc6 Bf4 8. hxg4 hxg4+ 9. Kg1 Kc7
11 4:00 +2.784 1. Nb5 axb5 2. Qa8+ Kd7 3. Bxb5+ c6 4. Qxb7+ Kd8 5. Qa8+
Qb8 6. Qxb8+ Bxb8 7. dxc6 Bf4 8. hxg4 hxg4+ 9. Kg1 Kc7
12 4:44 +++ 1. Nb5
12 5:45 +3.456 1. Nb5 axb5 2. Qa8+ Kd7 3. Bxb5+ c6 4. Qxb7+ Kd8 5. dxc6
f4 6. hxg4 hxg4+ 7. Kg1 Rh5 8. Qxf7 g3
Nodes = 18184603, QPerc: 69 %, time = 345.49 secs, 52.6 kN/s
Extensions: Check: 1100868 DblChk: 682 DiscChk: 30196 SingReply: 146522
Recapture: 79229 Passed Pawn: 2386 Zugzwang: 0
Hashing: Trans: 327349/5484305 = 5 % Pawn: 8527533/9004113 = 94 %
Eval: 3694418/12698531 = 29 %
EGTB Hits/Probes = 0/0
Hashtable 1: entries = 1048576, use = 659569
Crafty finds a similar line:
middle-game phase
clearing hash tables
time surplus 0.00 time limit 16:39 (16:39)
nss depth time score variation (1)
White(1): exit
6 0.87 1.57 1. Kg1 Bd4 2. hxg4 hxg4 3. Qa4 Bxc3
4. bxc3 Qxd5
6 1.67 1.79 1. f3 Kb8 2. fxg4 hxg4 3. Re3 gxh3
4. Rxh3
6-> 3.02 1.79 1. f3 Kb8 2. fxg4 hxg4 3. Re3 gxh3
4. Rxh3
7 3.90 1.53 1. f3 Kb8 2. fxg4 hxg4 3. Bf1 gxh3
4. gxh3 Qe7
7 4.81 ++ 1. Kg1!!
7 7.92 2.01 1. Nb5 Qf6 2. d6 Bxd6 3. Nxd6+ Qxd6
4. Qc3 f6 5. Qd2 Kd7 6. hxg4 hxg4+
7-> 8.88 2.01 1. Nb5 Qf6 2. d6 Bxd6 3. Nxd6+ Qxd6
4. Qc3 f6 5. Qd2 Kd7 6. hxg4 hxg4+
8 10.50 2.09 1. Nb5 Qf6 2. d6 Bxd6 3. Nxd6+ Qxd6
4. Qc3 f6 5. Kg1 Kd7 6. hxg4 hxg4
8 13.99 2.12 1. Kg1 Kb8 2. Kf1 Bd4 3. hxg4 Qf4 4.
Re2 hxg4
8-> 19.04 2.12 1. Kg1 Kb8 2. Kf1 Bd4 3. hxg4 Qf4 4.
Re2 hxg4
9 27.96 2.14 1. Kg1 Kb8 2. a3 Bd4 3. hxg4 hxg4 4.
Qb4 Qf4 5. Ne4
9 33.70 ++ 1. Nb5!!
9 36.72 3.20 1. Nb5 axb5 2. Qa8+ Kd7 3. Bxb5+ c6
4. Qxb7+ Kd8 5. Bxc6 Bd4 6. Kg1 Qc7
7. Qa8+ Qc8 8. Qxc8+ Kxc8 9. hxg4 hxg4
9-> 37.21 3.20 1. Nb5 axb5 2. Qa8+ Kd7 3. Bxb5+ c6
4. Qxb7+ Kd8 5. Bxc6 Bd4 6. Kg1 Qc7
7. Qa8+ Qc8 8. Qxc8+ Kxc8 9. hxg4 hxg4
10 52.95 3.41 1. Nb5 axb5 2. Qa8+ Kd7 3. Bxb5+ c6
4. Qxb7+ Kd8 5. dxc6 f4 6. hxg4 hxg4+
7. Kg1 g3 8. Qa8+ Qb8 9. Rd1+ Kc7
10-> 54.23 3.41 1. Nb5 axb5 2. Qa8+ Kd7 3. Bxb5+ c6
4. Qxb7+ Kd8 5. dxc6 f4 6. hxg4 hxg4+
7. Kg1 g3 8. Qa8+ Qb8 9. Rd1+ Kc7
11 1:34 ++ 1. Nb5!!
11 2:07 3.89 1. Nb5 axb5 2. Qa8+ Kd7 3. Bxb5+ c6
4. Qxb7+ Kd8 5. Qa8+ Kc7 6. Qa5+ Kb8
7. Qb6+ Kc8 8. Ba6+ Kd7 9. dxc6+ Ke6
10. f4 Rb8 11. Bc4+ Kf6 12. fxe5+
11-> 2:11 3.89 1. Nb5 axb5 2. Qa8+ Kd7 3. Bxb5+ c6
4. Qxb7+ Kd8 5. Qa8+ Kc7 6. Qa5+ Kb8
7. Qb6+ Kc8 8. Ba6+ Kd7 9. dxc6+ Ke6
10. f4 Rb8 11. Bc4+ Kf6 12. fxe5+
12 3:59 3.98 1. Nb5 axb5 2. Qa8+ Kd7 3. Bxb5+ c6
4. Qxb7+ Kd8 5. dxc6 f4 6. hxg4 hxg4+
7. Kg1 Rh5 8. Qxf7 g3 9. Qg8+ Kc7 10.
Qf7+ Kb8
12-> 4:06 3.98 1. Nb5 axb5 2. Qa8+ Kd7 3. Bxb5+ c6
4. Qxb7+ Kd8 5. dxc6 f4 6. hxg4 hxg4+
7. Kg1 Rh5 8. Qxf7 g3 9. Qg8+ Kc7 10.
Qf7+ Kb8
13 7:39 3.93 1. Nb5 axb5 2. Qa8+ Kd7 3. Bxb5+ c6
4. Qxb7+ Kd8 5. dxc6 f4 6. hxg4 hxg4+
7. Kg1 Rh5 8. Be2 Qc7 9. Qa8+ Qb8 10.
Qa5+ Qc7 11. Qd2+ Qd6
13-> 8:14 3.93 1. Nb5 axb5 2. Qa8+ Kd7 3. Bxb5+ c6
4. Qxb7+ Kd8 5. dxc6 f4 6. hxg4 hxg4+
7. Kg1 Rh5 8. Be2 Qc7 9. Qa8+ Qb8 10.
Qa5+ Qc7 11. Qd2+ Qd6
time=11:55 cpu=99% mat=0 n=100074664 fh=92% nps=139915
ext-> checks=6130623 recaps=276938 pawns=235937 1rep=706024
thrt:41527
predicted=0 nodes=100074664 evals=15378811
endgame tablebase-> probes done=0 successful=0
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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