Author: Robert Hyatt
Date: 09:52:39 09/03/00
Go up one level in this thread
On September 03, 2000 at 11:31:48, Uri Blass wrote:
>On September 03, 2000 at 11:17:50, Larry Griffiths wrote:
>
>>[D]3r2k1/p2r2p1/1p1B2Pp/4PQ1P/2b1p3/P3P3/7K/8 w - - bm e6;id "BT2450-27";
>>
>>Best move is "e6", but my program keeps picking "Qxe4".
>>
>>What makes e6 the correct move? I only ran this positions to 12 plys.
>>
>>Larry.
>
>The line 1.e6 Rxd6 2.Qf7+ Kh8 3.e7 Rd2+ 4.Kg3 b5 5.exd8Q+ Rxd8 6.Qxa7 gives
>white a material advantage.
>
>Another possibility is 4...Bxf7? 5.gxf7 Rg2+? 6.Kxg2 Rd2+ 7.Kg3 so without
>extensions you cannot and only 12 plies your program cannot see that white is
>winning.
>
>This possibility is probably the reason that your program cannot see the right
>move.
>
>Uri
There are probably evaluation terms in play here too. IE here is my output
on my PII/400 notebook:
7 0.31 0.95 1. Qxe4 Be6 2. Qf4 Rc8 3. e4 Rc2+ 4.
Kg3 a5
7-> 0.35 0.95 1. Qxe4 Be6 2. Qf4 Rc8 3. e4 Rc2+ 4.
Kg3 a5
8 0.44 0.94 1. Qxe4 Be6 2. Qf4 Rc8 3. e4 Kh8 4.
Kg3 a5
8 0.91 1.21 1. e6 Rxd6 2. Qf7+ Kh8 3. e7 Rd2+ 4.
Kg3 b5 5. e8=Q+ Rxe8 6. Qxe8+ Bg8 7.
Qxb5 Rd5 8. Qa6 Rd7
8-> 0.95 1.21 1. e6 Rxd6 2. Qf7+ Kh8 3. e7 Rd2+ 4.
Kg3 b5 5. e8=Q+ Rxe8 6. Qxe8+ Bg8 7.
Qxb5 Rd5 8. Qa6 Rd7
9 1.31 1.24 1. e6 Rxd6 2. Qf7+ Kh8 3. e7 Rd2+ 4.
Kg3 Bxf7 5. gxf7 Kh7 6. f8=Q Rxf8 7.
exf8=Q g5 8. hxg6+ Kxg6
9-> 1.69 1.24 1. e6 Rxd6 2. Qf7+ Kh8 3. e7 Rd2+ 4.
Kg3 Bxf7 5. gxf7 Kh7 6. f8=Q Rxf8 7.
exf8=Q g5 8. hxg6+ Kxg6
10 2.60 1.23 1. e6 Rxd6 2. Qf7+ Kh8 3. e7 Rd2+ 4.
Kg3 b5 5. e8=Q+ Rxe8 6. Qxe8+ Bg8 7.
Qxb5 Rd5 8. Qa6 Rxh5 9. Qxa7 Rf5
10-> 2.90 1.23 1. e6 Rxd6 2. Qf7+ Kh8 3. e7 Rd2+ 4.
Kg3 b5 5. e8=Q+ Rxe8 6. Qxe8+ Bg8 7.
Qxb5 Rd5 8. Qa6 Rxh5 9. Qxa7 Rf5
11 4.69 1.42 1. e6 Rxd6 2. Qf7+ Kh8 3. e7 Rd2+ 4.
Kg3 b5 5. e8=Q+ Rxe8 6. Qxe8+ Bg8 7.
Qxb5 Rd5 8. Qa6 Rxh5 9. Kf4 Rd5 10.
Qxa7
11-> 5.20 1.42 1. e6 Rxd6 2. Qf7+ Kh8 3. e7 Rd2+ 4.
Kg3 b5 5. e8=Q+ Rxe8 6. Qxe8+ Bg8 7.
Qxb5 Rd5 8. Qa6 Rxh5 9. Kf4 Rd5 10.
Qxa7
12 10.30 1.35 1. e6 Rxd6 2. Qf7+ Kh8 3. e7 Rd2+ 4.
Kg3 b5 5. Kf4 a6 6. Kxe4 Rd1 7. e8=Q+
Rxe8+ 8. Qxe8+ Bg8 9. Qc8 Rd5 10. Qg4
Rd2
12-> 17.26 1.35 1. e6 Rxd6 2. Qf7+ Kh8 3. e7 Rd2+ 4.
Kg3 b5 5. Kf4 a6 6. Kxe4 Rd1 7. e8=Q+
Rxe8+ 8. Qxe8+ Bg8 9. Qc8 Rd5 10. Qg4
Rd2
13 27.46 1.35 1. e6 Rxd6 2. Qf7+ Kh8 3. e7 Rd2+ 4.
Kg3 b5 5. a4 a6 6. e8=Q+ Rxe8 7. Qxe8+
Bg8 8. axb5 axb5 9. Qxb5 Rd8 10. Qb6
Rd2 11. Qc5
13-> 37.64 1.35 1. e6 Rxd6 2. Qf7+ Kh8 3. e7 Rd2+ 4.
Kg3 b5 5. a4 a6 6. e8=Q+ Rxe8 7. Qxe8+
Bg8 8. axb5 axb5 9. Qxb5 Rd8 10. Qb6
Rd2 11. Qc5
14 1:02 1.66 1. e6 Rxd6 2. Qf7+ Kh8 3. e7 Rd2+ 4.
Kg3 b5 5. Kf4 Ra8 6. e8=Q+ Rxe8 7.
Qxe8+ Bg8 8. Qxb5 Rd5 9. Qe2 Ra5 10.
Kxe4 Bd5+ 11. Kd4 Be6 12. e4 Rxa3
14-> 1:13 1.66 1. e6 Rxd6 2. Qf7+ Kh8 3. e7 Rd2+ 4.
Kg3 b5 5. Kf4 Ra8 6. e8=Q+ Rxe8 7.
Qxe8+ Bg8 8. Qxb5 Rd5 9. Qe2 Ra5 10.
Kxe4 Bd5+ 11. Kd4 Be6 12. e4 Rxa3
15 1:49 1.69 1. e6 Rxd6 2. Qf7+ Kh8 3. e7 Rd2+ 4.
Kg3 b5 5. Kf4 Ra8 6. e8=Q+ Rxe8 7.
Qxe8+ Bg8 8. Qxb5 Rd5 9. Qe2 Ra5 10.
Kxe4 Bd5+ 11. Kd4 Be6 12. a4 Rxa4+
13. Ke5
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