Author: Robert Hyatt
Date: 21:05:03 09/01/00
Go up one level in this thread
On August 30, 2000 at 16:01:52, Peter McKenzie wrote:
>This position is what could have happened in Nimzo - Shredder in London.
>Is from the possible variation 24...Qxb4 25.Qxd5
>
>Even this position requires 13ply (about 7.5 hours on my P133) for Lambchop to
>return a really bad score (see output below). I'd be interested in how other
>programs go on this position. (Note the terrible branching factor at depth 12
>and 13)
>
>[D]r3rb1k/6p1/p2p3p/1ppQ4/Pq6/5NRP/5PP1/1B2R1K1 b - -
>
> _______________________ Black to play
> 8 |br|__|__|__|br|bb|__|bk|
> 7 |__|__|__|__|__|__|bp|__|
> 6 |bp|__|__|bp|__|__|__|bp|
> 5 |__|bp|bp|WQ|__|__|__|__|
> 4 |WP|bq|__|__|__|__|__|__|
> 3 |__|__|__|__|__|WN|WR|WP|
> 2 |__|__|__|__|__|WP|WP|__|
> 1 |__|WB|__|__|WR|__|WK|__|
> a b c d e f g h
>
>Depth, score, time, nodes
>
> 0 0 0 0 e8e1
> 1 204 0 57 e8e1 f3e1 b4e1 g1h2
> 2 204 0 228 e8e1 f3e1 b4e1 g1h2
> 3 225 0 487 e8e1 f3e1 b4e1 g1h2 a8e8
> 4 280 0 1451 e8e1 f3e1 a8e8 g1h2 b4b1
> 5 209 100 5007 e8e1 f3e1 a8e8 d5f5 e8e1 g1h2 h8g8 f5h7 g8f7 h7g6 f7e7
> 6 209 200 10404 e8e1 f3e1 a8e8 d5f5 e8e1 g1h2 h8g8
> 7 73 700 68142 e8e1 f3e1 b4e1 g1h2 e1b1 d5a8 b1f5 g3f3 f5e5 h2h1
> 8 73 1100 118111 e8e1 f3e1 b4e1 g1h2 e1e8 d5d3 g7g6
> 9 32 2600 286579 e8e1 f3e1 b4e1 g1h2 e1e8 g3e3 e8b8 d5f5 d6d5 h2h1 g7g6 f5g
>6
>10 -25 7200 826264 e8e1 f3e1 b4e1 g1h2 e1e8 g3e3 e8d8 d5d3 g7g6 d3g6 a8a7 b1a
>2
>11 32 14700 1740365 e8e1 f3e1 b4e1 g1h2 e1e8 g3e3 e8b8 d5f5 g7g6 f5g6 b8b7
>
>12 -19 441600 53229976 e8e1 f3e1 b4e1 g1h2 e1e8 g3e3 e8d8 d5d3 g7g6 d3g6 d8d7 b
>1e4 d6d5 g6f6 h8g8
>
>13 -112 2648900 320991614 e8e1 f3e1 a8e8 d5f5 e8e1 g1h2 h8g8 f5h7 g8f7 g3f3 f7e8
>Q b1g6 e8d7 f3f8 e1e7 a4b5 a6b5 h7g8 b4c4 g6f5 d7c7
In my case, there is a small fail low at depth=11, a bigger one at 50 seconds
at depth=12, and the score drops to -1.43 after 4 minutes. Here is the output
where it also fails low again at depth=13...
10 5.72 0.02 1. ... Rxe1+ 2. Nxe1 Qxe1+ 3. Kh2 Qe8
4. Qd3 g6 5. Rxg6 Qe7 6. axb5 axb5
7. Qxb5 Qe5+ 8. Rg3 d5 9. Kg1
10-> 6.33 0.02 1. ... Rxe1+ 2. Nxe1 Qxe1+ 3. Kh2 Qe8
4. Qd3 g6 5. Rxg6 Qe7 6. axb5 axb5
7. Qxb5 Qe5+ 8. Rg3 d5 9. Kg1
11 36.79 -0.21 1. ... Rxe1+ 2. Nxe1 Qxe1+ 3. Kh2 Qe8
4. Re3 Qb8 5. Qf5 d5+ 6. Rg3 Kg8 7.
Qxd5+ Kh8 8. Qf5 Kg8 9. Qh7+ Kf7 10.
Be4 Ra7 11. Bd5+ Ke7 12. Qb1
11-> 37.96 -0.21 1. ... Rxe1+ 2. Nxe1 Qxe1+ 3. Kh2 Qe8
4. Re3 Qb8 5. Qf5 d5+ 6. Rg3 Kg8 7.
Qxd5+ Kh8 8. Qf5 Kg8 9. Qh7+ Kf7 10.
Be4 Ra7 11. Bd5+ Ke7 12. Qb1
12 50.07 -- 1. ... Rxe1+
12 4:06 -1.43 1. ... Rxe1+ 2. Nxe1 Re8 3. Qf5 Rxe1+
4. Kh2 Kg8 5. Qh7+ Kf7 6. Bg6+ Ke7
7. Rf3 Kd7 8. Rxf8 Re7 9. Qg8 Qd4 <HT>
12-> 4:21 -1.43 1. ... Rxe1+ 2. Nxe1 Re8 3. Qf5 Rxe1+
4. Kh2 Kg8 5. Qh7+ Kf7 6. Bg6+ Ke7
7. Rf3 Kd7 8. Rxf8 Re7 9. Qg8 Qd4 <HT>
13 5:49 -- 1. ... Rxe1+
13 12:10 -2.08 1. ... Rxe1+ 2. Nxe1 Re8 3. Qf5 Rxe1+
4. Kh2 Kg8 5. Qd5+ Kh8 6. Qf7 Qc4 7.
Qxf8+ Qg8 8. Qxd6 Rxb1 9. Rf3 bxa4
10. Rf8 Rb5 11. Rxg8+ Kxg8 12. Qxa6
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