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Subject: Re: Two Positions

Author: Robert Hyatt

Date: 10:49:58 11/09/01

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On November 09, 2001 at 12:32:37, Gerd Isenberg wrote:

>The first one from M-CHESS PRO 5 - IsiChess WMCCC95 should be quite easy. Bh4
>wins.
>
>[D] 1N4k1/3b1p1p/P2p1b2/4p3/4Pp2/2QB1P2/5KPP/3q4 b KQkq - bm Bh4

First, BAD FEN.  Neither side can castle.  Which program emitted this
stuff?  It needs to be repaired.

Second, you are correct.  Bh4 is easy:

                5     0.11  -0.41   1. ... Bh4+ 2. g3 fxg3+ 3. hxg3 Bxg3+
                                    4. Kg2 Be1 5. Qc2 Qxc2+ 6. Bxc2 Be6
         (2)    5->   0.13  -0.41   1. ... Bh4+ 2. g3 fxg3+ 3. hxg3 Bxg3+
                                    4. Kg2 Be1 5. Qc2 Qxc2+ 6. Bxc2 Be6
                6     0.16     --   1. ... Bh4+
                6     0.28   0.21   1. ... Bh4+ 2. g3 fxg3+ 3. hxg3 Bxg3+
                                    4. Kg2 Be1 5. Qc2 Qxc2+ 6. Bxc2 Bc8
                                    7. a7 Bb7
                6->   0.29   0.21   1. ... Bh4+ 2. g3 fxg3+ 3. hxg3 Bxg3+
                                    4. Kg2 Be1 5. Qc2 Qxc2+ 6. Bxc2 Bc8
                                    7. a7 Bb7
                7     0.39   0.54   1. ... Bh4+ 2. g3 fxg3+ 3. hxg3 Bxg3+
                                    4. Kg2 Be1 5. Qc2 Qxc2+ 6. Bxc2 Bc8
                                    7. a7 Bb7 8. Nd7
         (2)    7->   0.59   0.54   1. ... Bh4+ 2. g3 fxg3+ 3. hxg3 Bxg3+
                                    4. Kg2 Be1 5. Qc2 Qxc2+ 6. Bxc2 Bc8
                                    7. a7 Bb7 8. Nd7
                8     0.82   0.18   1. ... Bh4+ 2. g3 fxg3+ 3. hxg3 Bxg3+
                                    4. Kg2 Be1 5. Qc2 Qxc2+ 6. Bxc2 Bc8
                                    7. a7 Bb7 8. Nd7 Ba8
         (2)    8->   1.24   0.18   1. ... Bh4+ 2. g3 fxg3+ 3. hxg3 Bxg3+
                                    4. Kg2 Be1 5. Qc2 Qxc2+ 6. Bxc2 Bc8
                                    7. a7 Bb7 8. Nd7 Ba8
                9     1.76   0.00   1. ... Bh4+ 2. g3 fxg3+ 3. hxg3 Bxg3+
                                    4. Kg2 Bh3+ 5. Kxh3 Qh1+ 6. Kxg3 Qg1+
                                    7. Kh4 Qh2+ 8. Kg4 Qg2+ 9. Kh4 Qh2+
         (3)    9->   3.28   0.00   1. ... Bh4+ 2. g3 fxg3+ 3. hxg3 Bxg3+
                                    4. Kg2 Bh3+ 5. Kxh3 Qh1+ 6. Kxg3 Qg1+
                                    7. Kh4 Qh2+ 8. Kg4 Qg2+ 9. Kh4 Qh2+
               10     4.23     ++   1. ... Bh4+!!
         (2)   10    12.67  -2.24   1. ... Bh4+ 2. g3 fxg3+ 3. hxg3 Bxg3+
                                    4. Kg2 Be1 5. Qc2 Bh3+ 6. Kg1 Qxf3
                                    7. Nc6 Qe3+ 8. Kh2 Qf4+ 9. Kh1 Bf2
                                    10. a7
               10->  12.91  -2.24   1. ... Bh4+ 2. g3 fxg3+ 3. hxg3 Bxg3+
                                    4. Kg2 Be1 5. Qc2 Bh3+ 6. Kg1 Qxf3
                                    7. Nc6 Qe3+ 8. Kh2 Qf4+ 9. Kh1 Bf2
                                    10. a7
               11    16.85     ++   1. ... Bh4+!!
               11->  23.64  -2.63   1. ... Bh4+ 2. g3 fxg3+ 3. hxg3 Bxg3+
                                    4. Kg2 Be1 5. Qc2 Bh3+ 6. Kg1 Qxf3
                                    7. Nc6 Qe3+ 8. Kh2 Qf4+ 9. Kh1 Bf2
                                    10. a7

>
>The second one from Virtual Chess - IsiChess WM99 Paderborn. Rd8 looks
>promising. What does your program prefere?
>
>[D] r3k2r/1q3ppp/p3p3/6P1/1n2pP2/2P5/1P4QP/1R2KB1R b Kkq - am Rd8

I get Rd8, depth=14, score=-.14 (slightly better for black).




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