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Subject: Re: Back Issue, Rook_Pawn and the Wrong Bishop

Author: John Merlino

Date: 00:05:57 03/11/01

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On March 11, 2001 at 02:25:42, Ferdinand S. Mosca wrote:

>Hi Everyone,
>
>One of the games from the test between Deep Fritz and Crafty 18.01
>using P3_667mhz_128mb with 32mb each and 3+4+5 EGTB at G10.
>
>An illustrative game to examine showing the strenght of Crafty
>handling a passed pawn from early middle-game till the end-game until it reaches
>the following position. Crafty played bxa6?.
>
>Deep Fritz - Crafty 18.01 (1/2-1/2)
>[D]8/1k6/p7/KP1p4/P2B4/2P5/n7/8 w - - 0 1
>
>How many engines have progressed on this area?
>
>Tigers and Nimzo 8 seemed to take the rook_pawn.
>Deep Fritz, Junior 6, Hiarcs 7.32 and Yace does not take the rook_pawn.
>
>How do other programs evaluate this position?
>
>Regards,
>Dinan

CM8000 definitely will not take the pawn. After 4 minutes on a P3-833, it
actually considers bxa6 as the 8th best move out of 13.

Time	Depth	Score	Positions	Moves
0:00	7/8	1.93	20080		1. Bf6 axb5 2. axb5 Nc1 3. Be5
					Nd3 4. Bd6 Nf2 5. b6
0:00	8/9	1.76	47369		1. Bf6 Nc1 2. Be5 Ne2 3. Bg7 axb5
					4. axb5 Ng3 5. Be5 Ne4
0:00	9/10	1.70	121779		1. Bf6 Nc1 2. b6 Nd3 3. Bd4 Nc1
					4. Kb4 Nd3+ 5. Kb3 a5 6. c4
0:01	10/11	1.74	230750		1. Bf6 Nc1 2. b6 Nd3 3. Bd4 Nc1
					4. Kb4 Nd3+ 5. Kb3 a5 6. c4 Nc1+
					7. Kc2 Ne2
0:03	11/12	1.72	495408		1. Bf6 axb5 2. axb5 Nc1 3. b6 Nb3+
					4. Kb5 Nd2 5. Bd4 Nc4 6. Bc5 Ne5
					7. Bd6 Nd7
0:07	12/13	1.76	1045188		1. Bf6 Nc1 2. b6 Nd3 3. Bd4 Nc1
					4. Kb4 Nd3+ 5. Kb3 a5 6. Kc2 Nf4
					7. Be3 Ne6 8. Kd3
0:17	13/14	1.71	2434331		1. Bf6 Nc1 2. b6 Nd3 3. Bd4 Nc1
					4. Kb4 Nd3+ 5. Kb3 a5 6. Kc2 Nf4
					7. Kd2 Ne6 8. Kd3
0:35	14/15	1.72	5055364		1. Bf6 Nc1 2. b6 Na2 3. Bd4 Nc1
					4. Kb4 Nd3+ 5. Kb3 a5 6. Kc2 Nf4
					7. Be3 Ng2 8. Bc5 Ne1+ 9. Kd2 Nf3+
					10. Kd3
1:16	15/16	1.72	10904559	1. Bf6 Nc1 2. b6 Na2 3. Bd4 Nc1
					4. Kb4 Nd3+ 5. Kb3 a5 6. Kc2 Nf4
					7. Be3 Ng2 8. Bc5 Ne1+ 9. Kd2 Nf3+
					10. Kd3
3:06	16/17	1.71	26545876	1. Bf6 Nc1 2. b6 Nd3 3. Bd4 Nc1
					4. Kb4 Nd3+ 5. Kb3 a5 6. Kc2 Ne1+
					7. Kd2 Nf3+ 8. Ke3 Ne1 9. Ke2 Nc2
					10. Bf2 Na3 11. Kd3 Nc4

After 1.bxa6:

Time	Depth	Score	Positions	Moves
0:00	8/9	0.06	12107		1... Ka8 2. Kb5 Nxc3+ 3. Bxc3 Ka7
					4. Be5
0:00	10/11	0.06	65917		1... Ka8 2. Kb5 Nxc3+ 3. Bxc3 Ka7
					4. Be5 d4 5. Bxd4+
0:01	11/12	0.06	154082		1... Ka8 2. Kb5 Nxc3+ 3. Bxc3 Ka7
					4. Be5 d4 5. Bxd4+
0:02	12/13	0.06	311839		1... Ka8 2. Kb5 Nxc3+ 3. Bxc3 Ka7
					4. Be5 d4 5. Bxd4+
0:04	13/14	0.06	602285		1... Ka8 2. Kb5 Nxc3+ 3. Bxc3 Ka7
					4. Be5 d4 5. Bxd4+
0:08	14/15	0.06	1291311		1... Ka8 2. Kb5 Nxc3+ 3. Bxc3 Ka7
					4. Be5 d4 5. Bxd4+ Ka8 6. Be5
0:28	15/16	0.06	4359380		1... Ka8 2. Kb5 Nxc3+ 3. Bxc3 Ka7
					4. Be5 d4 5. Bxd4+ Ka8 6. Be5
1:47	16/17	0.06	16000588	1... Ka8 2. Kb5 Kb8 3. Be5+ Ka7
					4. c4 dxc4 5. Kxc4 Ka8 6. Kb5

jm



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