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Subject: Re: Testposition:12..Nxe5, 12..Nc6, or 12..Bc5?

Author: Mike Byrne

Date: 19:02:15 03/29/05

Go up one level in this thread


I prefer white here - black is very exposed.

Some Crafty Analysis

Crafty v19.20 (2 cpus)

White(1):[d]rnbq1rk1/pp1n1p1p/4p1p1/3pP1NP/1b3P2/1PpB4/P1P3P1/R1BQK2R b KQ - 0 1
Black(1): search Nxe5 [only - leads to draw score]
Black(1): st 600
search time set to 600.00.
Black(1): g
              time surplus   0.00  time limit 10:00 (10:00)
              depth   time  score   variation (1)
starting thread 1
                8     0.10  -1.05   1. ... Nxe5 2. fxe5 f6 3. Qg4 Nc6 4.
                                    Nxh7 Nxe5 5. Qxb4 Nxd3+ 6. cxd3 Kxh7
                                    7. Qxc3 gxh5 8. Rxh5+
                8->   0.11  -1.05   1. ... Nxe5 2. fxe5 f6 3. Qg4 Nc6 4.
                                    Nxh7 Nxe5 5. Qxb4 Nxd3+ 6. cxd3 Kxh7
                                    7. Qxc3 gxh5 8. Rxh5+
                9     0.27  -1.01   1. ... Nxe5 2. fxe5 Qc7 3. Qe2 h6 4.
                                    Nf3 g5 5. O-O Nc6
                9->   0.27  -1.01   1. ... Nxe5 2. fxe5 Qc7 3. Qe2 h6 4.
                                    Nf3 g5 5. O-O Nc6
               10     0.64  -0.76   1. ... Nxe5 2. fxe5 Be7 3. Qg4 Qc7
                                    4. Qg3 Bxg5 5. Bxg5 Nd7 6. hxg6 fxg6
                                    7. Be7
               10->   0.64  -0.76   1. ... Nxe5 2. fxe5 Be7 3. Qg4 Qc7
                                    4. Qg3 Bxg5 5. Bxg5 Nd7 6. hxg6 fxg6
                                    7. Be7
               11     2.05  -0.70   1. ... Nxe5 2. fxe5 Qc7 3. Qe2 f6 4.
                                    exf6 Rxf6 5. hxg6 hxg6 6. Rh6 Qg7 7.
                                    Nh7 Rf7 8. Bxg6
               11->   2.05  -0.70   1. ... Nxe5 2. fxe5 Qc7 3. Qe2 f6 4.
                                    exf6 Rxf6 5. hxg6 hxg6 6. Rh6 Qg7 7.
                                    Nh7 Rf7 8. Bxg6
               12     3.92     +1   1. ... Nxe5
               12     6.16  -0.01   1. ... Nxe5 2. fxe5 Qc7 3. Qe2 f6 4.
                                    hxg6 fxg5 5. Rxh7 Nd7 6. Rh8+ Kg7 7.
                                    Rh7+ Kg8
               12->   6.16  -0.01   1. ... Nxe5 2. fxe5 Qc7 3. Qe2 f6 4.
                                    hxg6 fxg5 5. Rxh7 Nd7 6. Rh8+ Kg7 7.
                                    Rh7+ Kg8
               13    10.70  -0.01   1. ... Nxe5 2. fxe5 Qc7 3. Qe2 f6 4.
                                    hxg6 fxg5 5. Rxh7 Nd7 6. Rh8+ Kg7 7.
                                    Rh7+ Kg8
               13->  10.70  -0.01   1. ... Nxe5 2. fxe5 Qc7 3. Qe2 f6 4.
                                    hxg6 fxg5 5. Rxh7 Nd7 6. Rh8+ Kg7 7.
                                    Rh7+ Kg8
               14    21.63  -0.01   1. ... Nxe5 2. fxe5 Qc7 3. Qe2 f6 4.
                                    hxg6 fxg5 5. Rxh7 Nd7 6. Rh8+ Kg7 7.
                                    Rh7+ Kg8
               14->  21.63  -0.01   1. ... Nxe5 2. fxe5 Qc7 3. Qe2 f6 4.
                                    hxg6 fxg5 5. Rxh7 Nd7 6. Rh8+ Kg7 7.
                                    Rh7+ Kg8
               15     2:32  -0.01   1. ... Nxe5 2. fxe5 Qc7 3. Qe2 f6 4.
                                    hxg6 fxg5 5. Rxh7 Nd7 6. Rh8+ Kg7 7.
                                    Rh7+ Kg8
               15->   2:32  -0.01   1. ... Nxe5 2. fxe5 Qc7 3. Qe2 f6 4.
                                    hxg6 fxg5 5. Rxh7 Nd7 6. Rh8+ Kg7 7.
                                    Rh7+ Kg8
              time=10:00  cpu=198%  mat=-4  n=2060311884  fh=92%  nps=3.43M
              ext-> chk=140040702 cap=5560011 pp=3796868 1rep=9550768 mate=42287
0
              predicted=0  nodes=2060311884  evals=439816410  50move=0
              endgame tablebase-> probes=0  hits=0
              SMP->  split=1156  stop=193  data=11/64  cpu=19:51  elap=10:00

Black(1): Nxe5
              time used:  10:00
White(2): undo
NOTICE: 60 moves to next time control

unguided search leads Nc6 with slight advantage to black


Black(1): go
              time surplus   0.00  time limit 10:00 (10:00)
              depth   time  score   variation (1)
                6     0.04  -2.40   1. ... Nc5 2. hxg6 hxg6 3. Nh7 Nxd3+
                                    4. Qxd3 Nd7 5. Nxf8 Qxf8
                6     0.06  -3.89   1. ... Be7 2. hxg6 hxg6 3. Nf3 Nc5
                                    4. Be3 Nxd3+ 5. Qxd3 Qc7
                6->   0.07  -3.89   1. ... Be7 2. hxg6 hxg6 3. Nf3 Nc5
                                    4. Be3 Nxd3+ 5. Qxd3 Qc7 (s=4)
                7     0.10     +1   1. ... Be7
                7     0.12  -3.73   1. ... Be7 2. hxg6 hxg6 3. Bxg6 Bxg5
                                    4. Bh7+ Kg7 5. fxg5 Nxe5 (s=3)
                7->   0.20  -3.73   1. ... Be7 2. hxg6 hxg6 3. Bxg6 Bxg5
                                    4. Bh7+ Kg7 5. fxg5 Nxe5 (s=4)
                8     0.21     +1   1. ... Be7
                8     0.26  -3.25   1. ... Be7 2. hxg6 hxg6 3. Bxg6 fxg6
                                    4. Nxe6 Bh4+ 5. Ke2 Qe7 6. Nxf8 Nxf8
                                    7. Qxd5+ (s=3)
                8->   0.45  -3.25   1. ... Be7 2. hxg6 hxg6 3. Bxg6 fxg6
                                    4. Nxe6 Bh4+ 5. Ke2 Qe7 6. Nxf8 Nxf8
                                    7. Qxd5+ (s=7)
                9     0.48     +1   1. ... Be7
                9     0.54     -1   1. ... Be7!!
                9     0.68  -3.66   1. ... Be7 2. Nxh7 Bh4+ 3. Kf1 Kxh7
                                    4. Qg4 Nxe5 5. fxe5 Be7 6. hxg6+ Kg7
                                    7. gxf7+ Kxf7 (s=6)
                9->   0.90  -3.66   1. ... Be7 2. Nxh7 Bh4+ 3. Kf1 Kxh7
                                    4. Qg4 Nxe5 5. fxe5 Be7 6. hxg6+ Kg7
                                    7. gxf7+ Kxf7 (s=2)
               10     0.95     +1   1. ... Be7
               10     1.21  -3.22   1. ... Be7 2. Nxh7 Bh4+ 3. Kf1 Kxh7
                                    4. Qg4 Kg8 5. Rxh4 Nc5 6. Ba3 Nbd7
                                    7. hxg6
               10->   1.90  -3.22   1. ... Be7 2. Nxh7 Bh4+ 3. Kf1 Kxh7
                                    4. Qg4 Kg8 5. Rxh4 Nc5 6. Ba3 Nbd7
                                    7. hxg6 (s=3)
               11     2.09     +1   1. ... Be7
               11     4.03  -1.33   1. ... Be7 2. hxg6 fxg6 3. Nxh7 Bh4+
                                    4. Kf1 Be7 5. Bxg6 Nxe5 6. Qh5 Nec6
                                    7. Nxf8 Kxf8 (s=2)
               11->   8.46  -1.33   1. ... Be7 2. hxg6 fxg6 3. Nxh7 Bh4+
                                    4. Kf1 Be7 5. Bxg6 Nxe5 6. Qh5 Nec6
                                    7. Nxf8 Kxf8
               12     9.87     +1   1. ... Be7
               12    15.04  -0.01   1. ... Be7 2. hxg6 fxg6 3. Bxg6 Bxg5
                                    4. Bxh7+ Kg7 5. Qh5 Nxe5 6. fxg5 Nbd7
                                    7. Qh6+ Kf7 8. Qh5+ Kg7
               12    23.48  -0.61   1. ... Nc5 2. hxg6 fxg6 3. Nxh7 Nxd3+
                                    4. Qxd3 Kg7 5. Nxf8 Qxf8 6. a3 Ba5
                                    7. b4 Bb6 8. Be3 Qf5 9. Qxc3 Bxe3 10.
                                    Qxc8 Bxf4 11. Qxb7+
               12    49.82  -0.71   1. ... Nc6 2. Nxh7 Qe8 3. a3 Bc5 4.
                                    b4 Bb6 5. hxg6 fxg6 6. Nxf8 Nxf8 7.
                                    Qg4 Qf7
               12->  57.21  -0.71   1. ... Nc6 2. Nxh7 Qe8 3. a3 Bc5 4.
                                    b4 Bb6 5. hxg6 fxg6 6. Nxf8 Nxf8 7.
                                    Qg4 Qf7 (s=4)
               13     1:06  -0.70   1. ... Nc6 2. Nxh7 Qe8 3. Nxf8 Nxf8
                                    4. hxg6 fxg6 5. Qg4 Bc5 6. Qh4 Qe7
                                    7. Qh6 Kf7 <HT> (s=3)
               13->   1:28  -0.70   1. ... Nc6 2. Nxh7 Qe8 3. Nxf8 Nxf8
                                    4. hxg6 fxg6 5. Qg4 Bc5 6. Qh4 Qe7
                                    7. Qh6 Kf7 <HT>
               14     2:06  -0.50   1. ... Nc6 2. Nxh7 g5 3. h6 Be7 4.
                                    Nxf8 Qxf8 5. Bb5 Qd8 6. Bxc6 bxc6 7.
                                    fxg5 Qc7 8. Bf4 Nxe5 9. Bxe5 Qxe5+
               14->   3:45  -0.50   1. ... Nc6 2. Nxh7 g5 3. h6 Be7 4.
                                    Nxf8 Qxf8 5. Bb5 Qd8 6. Bxc6 bxc6 7.
                                    fxg5 Qc7 8. Bf4 Nxe5 9. Bxe5 Qxe5+
                                    (s=2)
               15     6:31     +1   1. ... Nc6
              time=10:00  cpu=197%  mat=-4  n=2096077289  fh=95%  nps=3.49M
              ext-> chk=161667774 cap=5630531 pp=7299272 1rep=26310900 mate=6180
86
              predicted=0  nodes=2096077289  evals=419522332  50move=0
              endgame tablebase-> probes=0  hits=0
              SMP->  split=2626  stop=447  data=8/64  cpu=19:46  elap=10:00

Black(1): Nc6
              time used:  10:00



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