Computer opening disappeared ?

[Henk]

What happened to 1 Nc3. The so called computer opening. I don't see it played anymore by computers.

Code: Select all

Depth  Value   Time(seconds)   Nodes
1200    0.1359     246.27    54267684   e2e4 d7d5 e4d5 d8d5 d2d4 d5e4 g1e2 e7e5 b1d2 e4d5 d2f3 
1100    0.1364     155.17    22427258   d2d4 e7e6 g1f3 d7d5 b1c3 f8b4 c1f4 g8f6 e2e3 f6e4 
1000    0.0651      11.95     2467749   b1c3 g8f6 e2e3 d7d5 d2d4 b8c6 f1d3 c6b4 d3b5 
900    0.0479       5.58      896104   b1c3 b8c6 e2e3 e7e6 d2d4 f8d6 d4d5 c6e5 
800    0.1282       0.66      206937   b1c3 b8c6 e2e3 e7e5 f1c4 f8c5 c3e4 
700    0.0094       0.68      118181   b1c3 b8c6 d2d4 g8f6 e2e4 d7d5 
600    0.1258       0.18       30680   d2d4 b8c6 c1f4 g8h6 d4d5 
500    0.0012       0.03        7245   d2d4 b8c6 e2e4 d7d5 
400    0.1422       0.03        3971   d2d4 b8a6 e2e4 
300    0.2088       0.01         804   e2e4 b8c6 
200   -0.0038       0.01         166   e2e4 
100    0.2158       0.04          43   e2e4 

[Henk]

Without LMR. Fortunately black playing Nc6.

Code: Select all

Depth  Value   Time(seconds)   Nodes
1000    0.0194     196.99    33878843   e2e4 b8c6 d2d4 d7d5 e4d5 d8d5 
900    0.1853      36.42     6783941   e2e4 b8c6 b1c3 e7e5 f1c4 c6a5 c4b5 d8g5 
800    0.0106      14.78     2436782   e2e4 d7d5 e4d5 d8d5 g1f3 e7e6 
700    0.1956       3.70      578966   d2d4 d7d5 c1f4 b8c6 g1f3 g8f6 
600    0.0075       1.00      161772   e2e4 b8c6 b1c3 e7e5 
500    0.2152       0.15       28414   e2e3 e7e6 g1f3 g8f6 
400    0.0018       0.04        5534   e2e4 b8c6 d2d4 
300    0.2086       0.01        1092   e2e4 b8c6 
200    0.0081       0.01         166   e2e4 
100    0.2159       0.03          43   e2e4 

[Graham Banks]

I have the following lines in my GBSelect2016-2 opening book:

1. Nc3 c6 2. d4 d5 3. e4 dxe4 4. Nxe4 Bf5 5. Nc5 b6 6. Nb3 Nf6 7. Nf3 e6 8. g3 Bd6 *
1. Nc3 c6 2. d4 d5 3. e4 dxe4 4. Nxe4 Bf5 5. Nc5 b6 6. Nb3 Nf6 7. Nf3 e6 8. Bd3 Bxd3 *
1. Nc3 c6 2. d4 d5 3. e4 dxe4 4. Nxe4 Bf5 5. Nc5 e5 6. Nxb7 Qb6 7. Nc5 exd4 8. Na4 Qa5+ *
1. Nc3 c6 2. d4 d5 3. e4 dxe4 4. Nxe4 Bf5 5. Nc5 e5 6. Nxb7 Qb6 7. Nc5 exd4 8. Nb3 c5 *
1. Nc3 c6 2. d4 d5 3. e4 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Bc4 e6 8. N1e2 Nf6 *
1. Nc3 c6 2. d4 d5 3. e4 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. N1e2 Nf6 7. h4 h6 8. Nf4 Bh7 *
1. Nc3 c6 2. d4 d5 3. e4 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. c3 Nf6 7. Nf3 e6 8. Bc4 Bd6 *
1. Nc3 c6 2. d4 d5 3. Bf4 Bf5 4. f3 e6 5. g4 Bg6 6. Qd2 Nf6 7. h4 h6 8. e3 Nbd7 *
1. Nc3 c6 2. d4 d5 3. Bf4 Nf6 4. e3 g6 5. h3 Bg7 6. Nf3 Nbd7 7. Qd2 0-0 8. Bd3 b6 *
1. Nc3 c5 2. e4 d6 3. Nf3 a6 4. e5 Nc6 5. exd6 Qxd6 6. g3 Nf6 7. Bg2 e5 8. d3 Be7 *
1. Nc3 c5 2. e4 d6 3. Nf3 a6 4. e5 d5 5. d4 Bg4 6. e6 Bxe6 7. dxc5 Nf6 8. b4 Nc6 *
1. Nc3 c5 2. e4 d6 3. Nf3 a6 4. g3 Bg4 5. h3 Bxf3 6. Qxf3 Nc6 7. Nd5 e6 8. Ne3 Nf6 *

[Ras]

That opening is known by many names like Van Geet, but it has never been popular because it doesn't do much. The winning percentage for white is even less than 50%, according to Wikipedia. So I guess computers don't play it anymore because they have become stronger.


Here the search for the CT800 in the PC version (one thread since the program doesn't support multithreading):

Code: Select all

Depth Eval  Seconds Principal Variation
 ---  ----  ------- -------------------
  3   0.27   0.01   d2d4 g8f6 c1g5
  4   0.28   0.01   d2d4 g8f6 c1f4 b8c6
  5   0.32   0.02   d2d4 d7d5 g1f3 c8f5 c1f4
  6   0.22   0.04   d2d4 d7d5 c1f4 g8f6 g1f3 c8f5
  7   0.30   0.14   d2d4 d7d5 c1f4 c8f5 g1f3 b8c6 b1c3
  8   0.20   0.52   e2e4 b8c6 g1f3 g8f6 e4e5 f6e4 d2d3 e4c5
  9   0.36   1.26   e2e4 b8c6 g1f3 g8f6 b1c3 e7e6 d2d4 f8b4 c1g5
 10   0.18  10.25   d2d4 g8f6 e2e3 e7e6 g1f3 b8c6 f1d3 f8e7 e1g1 e8g8
 11   0.33  36.62   e2e4 e7e6 d2d4 f8b4 c1d2 b8c6 c2c3 b4e7 f1d3 d7d5 b1a3 g8f6
 12   0.31  92.08   e2e4 e7e5 g1f3 g8f6 f3e5 d7d6 e5c4 f6e4 d2d3 e4f6 c1e3 c8f5
 13   0.35 198.99   e2e4 e7e5 g1f3 g8f6 f3e5 d8e7 d2d4 d7d6 e5f3 e7e4 c1e3 f6d5 b1d2 d5e3

Of course, using the opening book, any move can be re-introduced, but since the question was with a search tree, I think the point was that they don't play it all by themselved, willingly.

In the opening book of CT800, 1. c3 is available as passive knowledge with many different lines to continue - just in case the opponent should play it.