Discussion of chess software programming and technical issues.
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Henk
Posts: 7216Joined: Mon May 27, 2013 10:31 am
Post by Henk Thu Jan 02, 2020 3:45 pm
In this position Bb5 looses a piece after c5-c4. Skipper does not see that.
So you can't reduce pawn moves.
[d] rnbq1rk1/pp2ppbp/5np1/2pp4/2B5/2N1PN2/PPPP1PPP/R1BQ1RK1 w - d6 0 7
Code: Select all
13 +0.07 13.7M 1:44.08 c4b5
12 -0.05 9.10M 1:07.25 c4e2 b8c6 e2b5 a7a6 b5e2 c8d7 e2d3 c6b4 d3e2 d7f5 d2d3 f5d7
11 -0.06 1.73M 0:11.03 c4b5 b8c6 b5a4 c8f5 d2d3 f5d7 a4b5 d8b8 c1d2 g7h6 a1b1
10 -0.02 691577 0:04.12 c4b5 b8c6 b5e2
9 +0.07 288998 0:01.64 c4d3
8 -0.05 90758 0:00.54 c4b5 b8c6 d2d4 c5d4 e3d4 a7a6 b5a4 c8d7
7 -0.05 39243 0:00.24 c4b5 b8c6 b5a4 d5d4 c3b5 c8d7 a1b1
6 -0.04 16227 0:00.12 c4b5 a7a6 b5a4 b7b5 a4b3 c8f5
5 -0.03 7230 0:00.06 c4b5 c8f5 f3e5 g7h6 a1b1
4 -0.02 2399 0:00.03 c4b5 f6g4 d2d4 c5c4
3 -0.02 483 0:00.02 c4b5 b8c6 a1b1
2 -0.03 204 0:00.01 c4b5 c8f5
1 -0.09 68 0:00.01 c4b5
Henk
Posts: 7216Joined: Mon May 27, 2013 10:31 am
Post by Henk Thu Jan 02, 2020 4:02 pm
When not applying LMR for pawn moves result is a bit better. No Bb5 at highest levels.
Code: Select all
13 -0.07 31.2M 3:50.52 c4e2 b8c6 d2d4 c5d4 f3d4 c6d4 e3d4 d8d6 e2f3 c8e6 c3b5 d6b4
12 -0.08 12.1M 1:22.84 c4e2 b8c6 d2d4 c5d4 f3d4 c6d4 e3d4 d8d6 c1g5 h7h6 c3b5 d6b4
11 +0.11 5.31M 0:34.08 c4d3
10 -0.03 2.48M 0:15.28 c4e2 b8c6 e2b5 a7a6 b5e2 d5d4 c3b1 f6d5 e2c4 g7f6
9 -0.06 943191 0:05.64 c4b5 a7a6 b5e2 b8c6 d2d4 c5d4 e3d4 d8b6 a1b1
8 -0.04 197059 0:01.09 c4b5 a7a6 b5d3 c5c4 d3e2 c8g4 d2d3 d8c7 d3c4 d5c4
7 -0.05 89882 0:00.53 c4b5 b8c6 d1e2 c8f5 b5a4 f5d7 a1b1
6 -0.04 22949 0:00.14 c4b5 a7a6 b5a4 b7b5 a4b3 c8f5
5 -0.03 8684 0:00.07 c4b5 c8f5 f3e5 g7h6 a1b1
4 -0.02 2960 0:00.03 c4b5 f6g4 d2d4 c5c4
3 -0.02 634 0:00.02 c4b5 b8c6 a1b1
2 -0.04 287 0:00.02 c4b5 c8f5
1 +0.01 63 0:00.01 c4e2
Pio
Posts: 334Joined: Sat Feb 25, 2012 10:42 pmLocation: Stockholm
Post by Pio Thu Jan 02, 2020 5:16 pm
Henk wrote: ↑ Thu Jan 02, 2020 3:45 pm
In this position Bb5 looses a piece after c5-c4. Skipper does not see that.
So you can't reduce pawn moves.
[d] rnbq1rk1/pp2ppbp/5np1/2pp4/2B5/2N1PN2/PPPP1PPP/R1BQ1RK1 w - d6 0 7
Code: Select all
13 +0.07 13.7M 1:44.08 c4b5
12 -0.05 9.10M 1:07.25 c4e2 b8c6 e2b5 a7a6 b5e2 c8d7 e2d3 c6b4 d3e2 d7f5 d2d3 f5d7
11 -0.06 1.73M 0:11.03 c4b5 b8c6 b5a4 c8f5 d2d3 f5d7 a4b5 d8b8 c1d2 g7h6 a1b1
10 -0.02 691577 0:04.12 c4b5 b8c6 b5e2
9 +0.07 288998 0:01.64 c4d3
8 -0.05 90758 0:00.54 c4b5 b8c6 d2d4 c5d4 e3d4 a7a6 b5a4 c8d7
7 -0.05 39243 0:00.24 c4b5 b8c6 b5a4 d5d4 c3b5 c8d7 a1b1
6 -0.04 16227 0:00.12 c4b5 a7a6 b5a4 b7b5 a4b3 c8f5
5 -0.03 7230 0:00.06 c4b5 c8f5 f3e5 g7h6 a1b1
4 -0.02 2399 0:00.03 c4b5 f6g4 d2d4 c5c4
3 -0.02 483 0:00.02 c4b5 b8c6 a1b1
2 -0.03 204 0:00.01 c4b5 c8f5
1 -0.09 68 0:00.01 c4b5
What happens if you do not reduce pawn moves that attack pieces (but not pawns)?
Henk
Posts: 7216Joined: Mon May 27, 2013 10:31 am
Post by Henk Thu Jan 02, 2020 10:24 pm
Not reducing pawn moves attacking non-pawn pieces gives about similar result as not reducing all pawn moves. But might perform better in other positions I don't know.
Still needs level 11.
So in a 3, 5 or 10 minute game it still would go wrong.
Code: Select all
13 -0.07 28.3M 3:42.54 c4e2 b8c6 d2d4 d8a5 c1d2 c5d4 e3d4 a5b6 c3a4 b6c7 d2g5 f6e4 g5e3
12 -0.09 16.4M 2:03.36 c4e2 b8c6 d2d4 c5d4 f3d4 c6d4 e3d4 d8b6 e2b5 a7a6 b5a4 c8f5
11 +0.03 1.92M 0:12.59 c4e2
10 +0.03 583472 0:03.60 c4b5
9 -0.04 325672 0:01.95 c4e2 b8c6 e2b5 a7a6 b5a4 b7b5 a4b3 c8f5
8 -0.05 129487 0:00.78 c4b5 b8c6 d2d4 c5d4 e3d4 a7a6 b5a4 c8d7
7 -0.04 53361 0:00.32 c4b5 a7a6 b5a4 b7b5 a4b3 b5b4 c3e2
6 -0.04 19144 0:00.14 c4b5 a7a6 b5a4 b7b5 a4b3 c8f5
5 -0.03 7442 0:00.05 c4b5 c8f5 f3e5 g7h6 a1b1
4 -0.02 2435 0:00.03 c4b5 f6g4 d2d4 c5c4
3 -0.02 481 0:00.02 c4b5 b8c6 a1b1
2 -0.03 202 0:00.01 c4b5 c8f5
1 -0.04 66 0:00.01 c4b5
Maybe add an SEE too for if pawn move can be traded there is no danger.