Computer opening

[Henk]

Skipper variation:

Code: Select all

Depth  Value   Time(seconds)   Nodes
140    0.1150      75.31    22274117   b1c3 b8c6 g1f3 g8f6 e2e3 e7e6 f1c4 f8e7 e1g1 e8g8 h2h3 d7d5 c4b5 c8d7 
130    0.0940      45.89    13711098   e2e4 e7e6 d2d3 b8c6 a2a3 g8f6 g1f3 b7b5 b1c3 b5b4 a3b4 f8b4 c1d2 
120    0.1370      54.63    15386461   e2e3 e7e6 g1f3 g8f6 f1e2 f8b4 e1g1 e8g8 a2a3 b4a5 b2b4 a5b6 
110    0.0960       9.51     2756285   g1f3 b8c6 b1c3 g8f6 d2d3 d7d6 a2a3 e7e5 e2e4 c6d4 c3d5 
100    0.1130       3.73     1065188   d2d4 g8f6 g1f3 d7d6 b1c3 a7a6 e2e4 b8c6 a2a3 c8g4 
 90    0.0910       0.48      153160   a2a3 d7d6 d2d3 a7a6 b1c3 g8f6 c1g5 h7h6 g5e3 
 80    0.1150       0.27       84445   b1c3 b8c6 d2d3 d7d6 e2e4 c6d4 g1f3 e7e5 
 70    0.0900       0.22       60969   g1f3 d7d6 b1c3 b8c6 d2d3 g8f6 a2a3 
 60    0.0930       0.04       12854   c2c3 d7d6 g1f3 a7a6 d2d3 b8c6 
 50    0.2080       0.03        8544   d2d3 d7d6 b1c3 b8c6 g1f3 
 40    0.0750       0.01        2306   b1c3 d7d6 d2d3 b8c6 
 30    0.1100       0.00         418   d2d3 d7d6 b1c3 
 20    0.0210       0.00         297   b1c3 d7d6 
 10    0.1910       0.00          47   d2d4 

[Greg Strong]

That's your standard search of the opening position? If so, the frequency with which the best move changes is suspicious, as is the fact that it includes a2a3.

[Ferdy]

[d]rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1

Code: Select all

Deuterium v2017.1.35.388:
   1/1	00:00	 +0.52	1.Nc3
   2/2	00:00	 +0.40	1.Nc3 c6
   3/4	00:00	 +0.70	1.Nf3
   3/3	00:00	 +0.82	1.Nf3 d6 2.Nc3
   4/4	00:00	 +0.68	1.Nf3 d5 2.Nc3 c6
   5/8	00:00	 +0.46	1.Nf3 Nc6 2.Nc3 d6 3.a3
  6/12	00:00	 +0.05	1.c4 Nf6 2.Nf3 d5 3.Nc3 Nc6 4.cxd5 Nxd5
  7/12	00:00	 +0.10	1.Nf3 Nc6 2.Nc3 Nf6 3.d3 d6 4.a3
  8/14	00:00	 +0.05	1.Nf3 Nc6 2.c4 Nf6 3.Nc3 d6 4.d4 Bd7
  9/20	00:00	 +0.16	1.d4 Nf6 2.Nc3 Nc6 3.d5 Na5 4.Nf3 Nc4 5.e3
 10/20	00:00	 +0.12	1.d4 Nf6 2.Nc3 Nc6 3.d5 Na5 4.Nf3 h5 5.e3 d6
 11/20	00:00	 +0.13	1.d4 Nf6 2.Nc3 Nc6 3.d5 Na5 4.Nf3 d6 5.e3 c6 6.a3
 12/24	00:00	 +0.09	1.d4 Nf6 2.Nc3 e6 3.Nf3 Nc6 4.Bf4 Bd6 5.Bxd6 cxd6 6.d5 Ne5 7.a3
 13/25	00:00	 +0.23	1.d4 Nf6 2.Nc3 Nc6 3.d5 Ne5 4.Nf3 d6 5.Nxe5 dxe5 6.e4 Bd7 7.Be3 h6
 14/28	00:00	 +0.18	1.d4 Nf6 2.Nc3 d5 3.Bf4 a6 4.Nf3 Nc6 5.Ne5 Bf5 6.Nxc6 bxc6 7.h3 h6 8.a3
 15/29	00:02	 +0.20	1.e4 Nc6 2.Nc3 Nf6 3.Nf3 e5 4.Bc4 Bd6 5.0-0 0-0 6.a3 a6 7.d4 b5 8.dxe5 Nxe5 9.Nxe5 Bxe5
 16/29	00:03	 +0.23	1.e4 Nc6 2.Nf3 Nf6 3.e5 Ng4 4.d4 d6 5.h3 Nh6 6.Nc3 Nf5 7.Bc4 dxe5 8.dxe5 Be6 9.Qxd8+ Rxd8 10.Bxe6 fxe6
 17/33	00:04	 +0.40	1.e4 Nc6 2.Nf3 Nf6 3.e5 Nd5 4.Nc3 e6 5.Bc4 Nb6 6.Bb5 Be7 7.0-0 0-0 8.d4 d6 9.a3
 18/32	00:07	 +0.26	1.e4 Nc6 2.Nf3 Nf6 3.e5 Nd5 4.Nc3 e6 5.Bc4 Nb6 6.Bb5 a6 7.Be2 d6 8.0-0 dxe5 9.d3 Be7 10.Be3
 19/34	00:09	 +0.29	1.e4 Nc6 2.Nf3 Nf6 3.e5 Nd5 4.Nc3 e6 5.Nxd5 exd5 6.d4 d6 7.c3 dxe5 8.dxe5 Be7 9.Bd3 0-0 10.0-0 Bg4 11.Bf4 Re8
 20/36	00:30	 +0.12	1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bc4 Be7 5.0-0 0-0 6.d3 d6 7.Be3 a6 8.Re1 Na5 9.Bd5 c6 10.Bb3 Nxb3 11.axb3

I need to look at my knight pst .

[Henk]

That's your standard search of the opening position? If so, the frequency with which the best move changes is suspicious, as is the fact that it includes a2a3.

It thinks a3 is a good move. Maybe because it wants to protect Nc3 against Bb4. And it knows that the more pawns are on the chessboard the more valuable Knights are.

Code: Select all

Depth  Value   Time(seconds)   Nodes
130    0.0690      51.84    15728048   a2a3 e7e6 b1c3 g8f6 e2e3 f8e7 f1d3 h7h6 g1e2 e8g8 e1g1 b8c6 f2f3 
120    0.1010      14.32     3851597   b1c3 b8c6 g1f3 g8f6 e2e3 e7e6 f1e2 f8c5 d2d4 c5b4 e1g1 e8g8 
110    0.0360      13.88     4095950   g1f3 g8f6 e2e3 e7e6 f1e2 f8d6 h2h3 b8a6 a2a3 e8g8 e1g1 
100    0.0620       1.66      493079   b1c3 d7d6 d2d3 b8c6 e2e4 c6d4 a2a3 a7a6 g1f3 e7e5 
 90    0.0200       1.08      259115   d2d3 d7d6 b1c3 b8c6 e2e4 c6d4 c1e3 e7e5 g1f3 
 80    0.1040       0.46      149973   d2d3 d7d6 b1c3 b8c6 e2e4 c6d4 g1f3 e7e5 
 70    0.1370       0.20       57814   g1f3 d7d6 d2d3 b8c6 b1c3 g8f6 a2a3 
 60    0.0540       0.06       20115   f2f3 a7a6 b1c3 d7d6 e2e3 b8c6 
 50    0.1100       0.02        5112   g1f3 d7d6 d2d3 b8c6 b1c3 
 40    0.0670       0.01        1547   g1f3 d7d6 d2d3 b8c6 
 30    0.1100       0.00         426   d2d3 d7d6 b1c3 
 20    0.0220       0.01         269   e2e3 d7d6 
 10    0.1810       0.04          51   e2e4 

[Ras]

If so, the frequency with which the best move changes is suspicious

No, it just indicates that Skipper doesn't see much of a difference between the starting moves. It's the noise of move generation, sorting and eval.

[Ras]

It thinks a3 is a good move.

Yes, and that's a bad thing because it wastes a move that would have been used better for development.

Even if Bb4, b2 covers that. If Bb4xNc3, then b2xc3, and White has the pair of bishops, the semi-open b file, Bc1-a3 might keep Black from castling, and the c3 pawn could be traded on c4/d5, giving White more centre pawns.

[Henk]

Code: Select all

Depth  Value   Time(seconds)   Nodes
150    0.0570     466.04   175754669   a2a3 b8c6 b1c3 a7a6 e2e3 e7e6 d1e2 d7d6 d2d3 g8e7 g1f3 e7d5 c3d5 e6d5 h2h3 
140    0.1150      27.48    10975545   b1c3 b8c6 g1f3 g8f6 e2e4 e7e6 f1b5 f8e7 e4e5 f6d5 c3d5 e6d5 e1g1 e8g8 
130    0.0750      11.55     3975412   g1f3 b8c6 e2e3 e7e5 b1c3 g8f6 f1d3 f8b4 
120    0.0850       9.83     3760686   a2a3 a7a6 b1c3 b8c6 d2d3 g8f6 g1f3 d7d6 c1d2 e7e6 d2c1 e6e5 
110    0.0590       3.93     1440000   d2d3 b8c6 a2a3 g8f6 b1c3 a7a6 g1f3 d7d6 c1d2 e7e6 d2c1 
100    0.0460       2.17      751134   g1f3 b8c6 b1a3 g8h6 d2d3 h6f5 e2e4 f5d4 c2c3 d4e6 
 90    0.0650       0.98      402258   a2a3 a7a6 b1c3 b8c6 d2d3 g8f6 g1f3 d7d6 c1d2 
 80    0.0740       0.33      138159   g1h3 b8c6 b1c3 a7a6 a2a3 c6d4 e2e3 d4f5 
 70    0.1090       0.18       74058   b1a3 e7e6 a3c4 b8c6 g1h3 b7b5 c4e3 
 60    0.0640       0.08       34044   g1h3 b8c6 b1c3 c6d4 e2e3 d4f5 
 50    0.1550       0.02        6267   b1c3 b8c6 g1f3 g8f6 a2a3 
 40    0.0760       0.01        2747   d2d3 a7a6 b1c3 b8c6 
 30    0.1100       0.01         432   b1c3 b8c6 g1f3 
 20    0.0000       0.01         294   b1c3 b8c6 
 10    0.1610       0.03          45   b1c3 

[Henk]

ha ha ha ha h4

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Depth  Value   Time(seconds)   Nodes
150    0.0450     407.53   131063172   h2h4 a7a6 b1c3 d7d6 g1f3 b8c6 a2a3 g8f6 d2d3 f6g4 c1f4 g4f6 e2e3 e7e6 f1e2 
140    0.0820      25.03     8290610   h2h4 a7a6 b1c3 b8c6 a2a3 d7d6 g1f3 g8f6 d2d3 e7e6 c1d2 e6e5 d2e3 h7h6 
130    0.1370      24.07     7949520   g1f3 b8c6 e2e3 e7e5 b1c3 g8f6 f1e2 f8b4 
120    0.0750       9.21     2999941   d2d4 a7a6 b1c3 g8f6 a2a3 b8c6 g1f3 d7d6 d4d5 c6e5 f3e5 d6e5 
110    0.0920       6.16     1879954   e2e4 b8c6 b1c3 d7d6 g1f3 a7a6 a2a3 g8f6 d2d3 e7e6 f1e2 
100    0.0420       1.64      505469   e2e3 a7a6 a2a3 b8c6 b1c3 c6e5 d2d4 e5c6 g1f3 g8f6 
 90    0.0990       0.47      157202   h2h4 a7a6 b1c3 b8c6 a2a3 d7d6 g1f3 g8f6 d2d3 
 80    0.1210       0.09       35009   a2a3 b8c6 b1c3 g8f6 d2d3 c6d4 g1f3 c7c5 
 70    0.1500       0.08       32790   b1c3 b8c6 g1f3 g8f6 a2a3 a7a6 d2d3 
 60    0.0610       0.06       18853   c2c3 a7a6 d2d3 d7d6 g1f3 b8c6 
 50    0.1300       0.02        6529   a2a3 b8c6 b1c3 g8f6 g1f3 
 40    0.0470       0.01        2617   f2f3 a7a6 b1c3 b8c6 
 30    0.1100       0.01         366   g1f3 b8c6 b1c3 
 20    0.0780       0.01         187   g1f3 b8c6 
 10    0.1590       0.04          49   d2d3 

[Ras]

Looks like your static eval would appreciate some improvement...

[Henk]

If I add more knowledge to evaluation it scores less on the WAC test. That means it would perform worse tactically. And tactics are very important in chess.