Author: Dann Corbit
Date: 10:26:56 11/22/00
Go up one level in this thread
On November 21, 2000 at 23:17:27, Michael Neish wrote:
>
>Hello,
>
>I know some programs have code in their evaluations to detect a possible Greek
>gift sacrifice, and avoid it. But is there any program that can iterate through
>the moves for a more detailed search? Is there a way to do this statically?
>
>There are probably several key factors, such as whether the Black pieces can
>come to the rescue, whether the White King is vulnerable to in-between checks
>which might allow Black to reposition. I suspect one could analyse these
>factors in PreEval(), or earlier one could find out the potential of a Greek
>gift sacrifice arising, and possibly alter one's strategy accordingly. Far
>fetched maybe.
>
>I thought of these questions when the following position arose in a computer v
>computer game (my program (W) v Sigma Chess (B)). I don't know whether there is
>a forced win - maybe not - but after 12. Bxh7 Kxh7 13. Ng5+, 13. ... Kg8 seems
>to lose. 13. ... Kg6 puts up more resistance, but I don't know whether White
>will win.
>
>[D]r4rk1/pp1bnppp/1qn1p3/1NbpP3/8/3B1N2/PPPBQPPP/R3K2R w - -
>
>Hiarcs 7 seems to like 14. h4, but still gives the advantage to Black (less than
>a Pawn). Can any program find a win? Can any human, for that matter?
Phalanx wants to castle:
r4rk1/pp1bnppp/1qn1p3/1NbpP3/8/3B1N2/PPPBQPPP/R3K2R w - -
-> increment adds 7.2 s to soft time limit
-> soft time limit 127.2 s
-> hard time limit 708 s
5 -28 52 81442 Pa2-a4 !
5 -15 56 89053 Pa2-a4 Nc6-b4 Bd2xb4 Bc5xb4 Pc2-c3 Bb4-c5
O-O
5 -> 0:00.77 122893 1 turn
6 -15 103 161924 Pa2-a4 ??
6 -126 120 198977 Pa2-a4 Pa7-a6 Nb5-d6 Nc6-b4 Bd2-g5 Nb4xd3
6 -121 126 210695 Ra1-b1 !
6 -26 172 292179 Ra1-b1 Pa7-a6 Nb5-c3 Nc6-b4 O-O Nb4xd3
Pc2xd3 Qb6-b4
6 -> 0:03.78 620829 1 turn
7 -27 582 997215 Ra1-b1 Ne7-g6 Pa2-a4 Nc6-b4 O-O Nb4xd3
Qe2xd3
7 -22 715 1247370 O-O !
7 1 800 1410900 O-O Pa7-a6 Nb5-c3 Nc6-b4 Bd2-g5 Nb4xd3
Pc2xd3 Ne7-f5 Ra1-c1
7 -> 0:11.47 1940259 1 turn
8 -10 1620 2812785 O-O Pa7-a6 Nb5-c3 Nc6-b4 Nf3-e1 Ra8-c8
Bd2-f4 Nb4xd3 Ne1xd3 Ne7-f5 Nd3xc5 Qb6xc5
8 -> 0:29.80 4954563 0 turns
9 -20 5554 9820667 O-O Pf7-f6 Pe5xf6 Rf8xf6 Bd2-g5 Rf6-f8
Pc2-c4 Nc6-b4 Bg5xe7 Bc5xe7
9 -> 1:56.94 19937233 0 turns
10 -10 18233 31911313 O-O Pa7-a6 Nb5-c3 Nc6-b4 Bd2-g5 Ra8-c8
Nf3-e1 Qb6-a5 Qe2-h5 Nb4xd3
10 -> 5:16.36 52303444 0 turns
Depth=10, Value=-10, Time=316.36, Last turn=7.15, Nodes=52303444, N/s=165328
PV = O-O Pa7-a6 Nb5-c3 Nc6-b4 Bd2-g5 Ra8-c8 Nf3-e1 Qb6-a5
Qe2-h5 Nb4xd3
Crafty wants Nc3, but it looks very bleak. If there is any good idea, it is
probably the castle choice. I suspect the problem was a earlier move, leading
to this position.
White(1): setboard r4rk1/pp1bnppp/1qn1p3/1NbpP3/8/3B1N2/PPPBQPPP/R3K2R w - -
White(1): go
time surplus 0.00 time limit 16666:39 (16666:39)
nss depth time score variation (1)
6 0.27 -0.27 1. c3 Na5 2. Be3 Nc4 3. Bxc5 Qxc5 4.
Nbd4
6-> 0.69 -0.27 1. c3 Na5 2. Be3 Nc4 3. Bxc5 Qxc5 4.
Nbd4
7 0.96 -0.44 1. c3 a6 2. b4 Bxf2+ 3. Qxf2 Qxf2+
4. Kxf2 axb5 5. Rhe1 Nd8
7 1.84 -0.31 1. Rb1 a6 2. Nc3 Nb4 3. Bg5 Nxd3+ 4.
cxd3 h6 5. Bf4
7-> 2.41 -0.31 1. Rb1 a6 2. Nc3 Nb4 3. Bg5 Nxd3+ 4.
cxd3 h6 5. Bf4
8 2.75 -0.52 1. Rb1 a6 2. Nc3 Nb4 3. Bg5 Qc7 4.
Bxe7 Bxe7 5. Rd1 Nxd3+ 6. Qxd3
8-> 7.83 -0.52 1. Rb1 a6 2. Nc3 Nb4 3. Bg5 Qc7 4.
Bxe7 Bxe7 5. Rd1 Nxd3+ 6. Qxd3
9 9.30 -0.53 1. Rb1 a6 2. Nc3 Nb4 3. Bg5 Qc7 4.
Rc1 Nxd3+ 5. cxd3 Rac8 6. Nd4 Bxd4
7. Bxe7
9-> 16.36 -0.53 1. Rb1 a6 2. Nc3 Nb4 3. Bg5 Qc7 4.
Rc1 Nxd3+ 5. cxd3 Rac8 6. Nd4 Bxd4
7. Bxe7
10 20.43 -0.61 1. Rb1 a6 2. Nc3 Nb4 3. Rc1 Rac8 4.
Bg5 Qc7 5. Rf1 Nxd3+ 6. cxd3 h6 <HT>
10-> 40.18 -0.61 1. Rb1 a6 2. Nc3 Nb4 3. Rc1 Rac8 4.
Bg5 Qc7 5. Rf1 Nxd3+ 6. cxd3 h6 <HT>
11 54.45 -0.74 1. Rb1 a6 2. Nc3 Qc7 3. Ng5 h6 4. Nf3
Ng6 5. Bxg6 fxg6 6. Be3 d4
11-> 2:50 -0.74 1. Rb1 a6 2. Nc3 Qc7 3. Ng5 h6 4. Nf3
Ng6 5. Bxg6 fxg6 6. Be3 d4
12 3:08 -0.80 1. Rb1 a6 2. Nc3 Qc7 3. Rd1 Ng6 4.
Bxg6 fxg6 5. Be3 Bb4 6. Bd2 Rac8 7.
Rf1
12 6:59 -0.78 1. Nc3 Nb4 2. Nd1 Rac8 3. a3 Nxd3+
4. cxd3 Ba4 5. Bg5 h6 6. Nc3 Bd7 7.
Be3 f5 8. exf6 Rxf6 9. Bxc5 Qxc5
12-> 9:38 -0.78 1. Nc3 Nb4 2. Nd1 Rac8 3. a3 Nxd3+
4. cxd3 Ba4 5. Bg5 h6 6. Nc3 Bd7 7.
Be3 f5 8. exf6 Rxf6 9. Bxc5 Qxc5
13 13:10 -0.85 1. Nc3 Nb4 2. Nd1 Rac8 3. a3 Nxd3+
4. cxd3 Ba4 5. Bg5 h6 6. Nc3 Bb3 7.
Bf4 f5 8. exf6 Rxf6
13 16:43 -0.83 1. Rb1 a6 2. Nc3 Qc7 3. Rd1 Ng6 4.
Bxg6 fxg6 5. Be3 Bb4 6. Bd2 Rac8 7.
a3 Bc5
13-> 24:18 -0.83 1. Rb1 a6 2. Nc3 Qc7 3. Rd1 Ng6 4.
Bxg6 fxg6 5. Be3 Bb4 6. Bd2 Rac8 7.
a3 Bc5
14 26:51 -0.94 1. Rb1 a6 2. Nc3 Qc7 3. Ng5 h6 4. Nf3
Ng6 5. Bxg6 fxg6 6. Rc1 Nd4 7. Nxd4
Bxd4 8. f4 Rac8
14 44:20 -0.84 1. Nc3 Nb4 2. Nd1 Rac8 3. Bxb4 Qxb4+
4. c3 Qf4 5. Qd2 Qxd2+ 6. Kxd2 f6 7.
Re1 fxe5 8. Nxe5 Ba4 9. b3 Be8
14-> 71:59 -0.84 1. Nc3 Nb4 2. Nd1 Rac8 3. Bxb4 Qxb4+
4. c3 Qf4 5. Qd2 Qxd2+ 6. Kxd2 f6 7.
Re1 fxe5 8. Nxe5 Ba4 9. b3 Be8
15 89:51 -0.86 1. Nc3 Nb4 2. Nd1 Rac8 3. Bxb4 Qxb4+
4. c3 Qg4 5. Ne3 Qf4 6. Bc2 f6 7. g3
Qh6 8. Kd1 Qh3
15-> 161:13 -0.86 1. Nc3 Nb4 2. Nd1 Rac8 3. Bxb4 Qxb4+
4. c3 Qg4 5. Ne3 Qf4 6. Bc2 f6 7. g3
Qh6 8. Kd1 Qh3
16 242:14 -0.87 1. Nc3 Nb4 2. Nd1 Rac8 3. Bxb4 Qxb4+
4. c3 Qf4 5. Qd2 Qxd2+ 6. Kxd2 Nc6
7. Re1 d4 8. Ke2 dxc3 9. Nxc3 Rfd8
10. Kf1 h6
16-> 527:34 -0.87 1. Nc3 Nb4 2. Nd1 Rac8 3. Bxb4 Qxb4+
4. c3 Qf4 5. Qd2 Qxd2+ 6. Kxd2 Nc6
7. Re1 d4 8. Ke2 dxc3 9. Nxc3 Rfd8
10. Kf1 h6
17 737:31 -0.89 1. Nc3 Nb4 2. Nd1 Nxd3+ 3. cxd3 Rfc8
4. Rc1 Ng6 5. a3 Be7 6. Be3 <HT>
17 792:45 3/44* 1. Rb1
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