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Reducing Strength
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Ferdinand Mosca



Joined: 10 Aug 2008
Posts: 452
Location: Philippines
PostPost subject: Re: Reducing Strength    Posted: Thu Mar 15, 2012 10:34 am Reply to topic Reply with quote
kinderchocolate wrote:
Other than limiting the number of nodes and depths, any suggestions on how to reduce the playing strength as realistic as possible? I've found that limiting the number of nodes isn't working very well.

Also, what'd be the best way to tune the parameters?


I am planning to implement also this feature, what I have in mind is simply to generate multipv, sort it and you may choose the moves depending on the pv score. Sample 30 pv, +0.69 f2-f4 is best and -1.06 Nd4-e2 is worst. If you want the user to equalize use, 0.00 Nb1-d2.
If you want to scale the strength probably choose the moves based on the pv score. Scaling is better if you are able to reach higher depths in your multipv. The pv's below are from a search of 14 plies.
[d]r1bqk1nr/pppp1ppp/8/2b1n3/3NP3/4B3/PPP2PPP/RN1QKB1R w KQkq - 3 6
BR :: BB BQ BK :: BN BR
BP BP BP BP :: BP BP BP
   ::    ::    ::    ::
::    BB    BN    ::    
   ::    WN WP ::    ::
::    ::    WB    ::    
WP WP WP ::    WP WP WP
WR WN :: WQ WK WB :: WR

Code:
  14   03:32    147,115,522   690,978   -1.06   Nd4-e2 Bc5xe3 f2xe3 Ng8-f6 Ne2-g3 d7-d6 Bf1-e2 O-O O-O Nf6-g4 Be2xg4 Ne5xg4 Qd1-d4 Qd8-h4 h2-h3 Ng4-e5
  14   03:32    142,520,806   690,180   -0.75   g2-g3 Ng8-f6 Bf1-e2 d7-d6 Nb1-c3 Bc8-h3 Be2-f1 Bh3-g4 Bf1-b5+ Ke8-f8 Bb5-e2 Bg4-h3 Be3-g5 Kf8-g8 Nc3-d5
  14   03:32    140,484,939   689,489   -0.64   Nd4-b5 Bc5xe3 f2xe3 Ng8-f6 Bf1-e2 a7-a6 Nb5-c3 O-O O-O d7-d6 Nb1-d2 Bc8-e6 Nd2-f3 Nf6-g4 Nf3xe5 Ng4xe5
  14   03:32    143,047,626   690,231   -0.64   Rh1-g1 Ng8-f6 Nb1-c3 Nf6-g4 Be3-f4 O-O Bf1-e2 Ne5-g6 Bf4-g3 Ng4-e5 Nc3-d5 d7-d6 Nd4-b3 Bc5-b6 Nd5xb6 a7xb6
  14   03:32    141,339,175   689,826   -0.62   Qd1-h5 d7-d6 Qh5-e2 Ng8-f6 Nb1-c3 O-O O-O-O Nf6-g4 Kc1-b1 Ng4xe3 Qe2xe3 Bc8-d7 Bf1-e2 c7-c6 h2-h4
  14   03:32    138,950,767   689,243   -0.61   a2-a3 Ng8-f6 Bf1-e2 Nf6xe4 O-O O-O Nb1-d2 Ne4xd2 Qd1xd2 Rf8-e8 b2-b4 Bc5-b6 Rf1-e1 d7-d6 c2-c3
  14   03:32    131,094,466   688,246   -0.47   Be3-c1 Ng8-f6 Nb1-c3 Bc5-b4 Nd4-f3 Ne5xf3+ Qd1xf3 O-O Bf1-d3 Bb4xc3+ b2xc3 d7-d5 O-O d5xe4
  14   03:32    127,711,527   688,297   -0.39   Qd1-c1 Ng8-f6 Nb1-c3 O-O Bf1-e2 d7-d5 e4xd5 Nf6xd5 O-O Nd5xe3 f2xe3 Kg8-h8 Rf1-d1 Bc5-d6 Nc3-e4 Bd6-b4
  14   03:32    126,819,862   688,179   -0.37   h2-h4 Ng8-f6 f2-f3 O-O Nb1-c3 d7-d6 Bf1-e2 Qd8-e7 O-O Bc8-d7 Kg1-h2 a7-a6 Qd1-d2 Bd7-e6 Nd4xe6 Bc5xe3
  14   03:32    144,362,633   690,700   -0.33   b2-b3 Ng8-f6 f2-f3 O-O Bf1-e2 d7-d5 Nd4-c6 Ne5xc6 Be3xc5 Rf8-e8 O-O d5xe4 Nb1-c3 Bc8-f5 f3xe4 Bf5xe4 Nc3xe4 Re8xe4
  14   03:32    122,379,845   687,299   -0.33   a2-a4 Ng8-f6 f2-f3 O-O Nb1-c3 d7-d6 Bf1-e2 c7-c6 O-O Qd8-b6 b2-b3 Bc8-e6 Kg1-h1 Rf8-e8
  14   03:32    133,017,454   688,638   -0.30   c2-c4 Ng8-f6 f2-f3 d7-d6 Bf1-e2 O-O Nb1-c3 Bc5xd4 Be3xd4 Bc8-e6 Qd1-b3 c7-c5 Bd4xe5 d6xe5 O-O Qd8-c7
  14   03:32    118,162,108   686,589   -0.29   h2-h3 Ng8-f6 Nb1-c3 O-O f2-f4 Ne5-g6 Nd4-c6 b7xc6 Be3xc5 d7-d6 Bc5-e3 Rf8-e8 Bf1-d3 Ra8-b8
  14   03:32    136,034,251   688,903   -0.27   Nb1-a3 Ng8-f6 Na3-c4 Ne5-g4 e4-e5 Ng4xe3 Nc4xe3 Nf6-e4 c2-c3 O-O Bf1-d3 d7-d5 O-O Rf8-e8 Bd3xe4 d5xe4
  14   03:32    108,754,456   685,490   -0.22   b2-b4 Bc5xb4+ c2-c3 Bb4-e7 Nd4-f5 Ng8-f6 Nf5xg7+ Ke8-f8 Be3-h6 Kf8-g8 Ng7-f5 d7-d5 Nf5xe7+
  14   03:32    100,081,793   684,685   -0.21   Be3-f4 Ne5-g6 Bf4-e3 Ng8-f6 Bf1-d3 Ng6-e5 Nd4-c6 b7xc6 Be3xc5 d7-d6 Bc5-d4 Ne5xd3+ Qd1xd3 O-O O-O Bc8-e6
  14   03:32     98,085,328   684,465   -0.21   c2-c3 Ng8-f6 Nb1-d2 d7-d5 Bf1-b5+ c7-c6 Bb5-e2 Nf6-g4 O-O O-O Be3-f4 Qd8-f6 Bf4-g3 Bc8-d7 f2-f4
  14   03:32    101,842,157   684,740   -0.14   Qd1-e2 Ng8-f6 Nb1-c3 d7-d6 O-O-O O-O Kc1-b1 Bc8-d7 f2-f3 a7-a5 Qe2-f2 c7-c6 Bf1-e2 b7-b5
  14   03:32     97,157,363   684,245   -0.04   Bf1-d3 Ng8-f6 Nd4-c6 b7xc6 Be3xc5 d7-d6 Bc5-d4 Ra8-b8 O-O O-O Nb1-d2 Bc8-g4 Qd1-c1 Ne5xd3 c2xd3
  14   03:32     94,689,886   684,313   -0.03   Bf1-b5 Ng8-f6 O-O O-O Nb1-c3 d7-d6 Qd1-d2 Bc8-d7 Bb5-e2 c7-c6 a2-a3 Nf6-g4 Be3-g5 Qd8-c7
  14   03:32    115,908,711   686,630   -0.02   Qd1-d2 Ng8-f6 Nb1-c3 Nf6-g4 Be3-f4 O-O O-O-O Ne5-d3+ Bf1xd3 Bc5xd4 Nc3-b5 Bd4-b6 Bf4-g5 f7-f6 Bd3-c4+ Kg8-h8
  14   03:32     77,371,544   685,043    0.00   Nb1-d2 Ng8-f6 Bf1-e2 d7-d6 O-O O-O c2-c3 a7-a5 h2-h3 Bc8-d7 f2-f4 Ne5-c6 Kg1-h2 Nc6xd4 Be3xd4 Bc5xd4 c3xd4
  14   03:32     85,379,151   685,583   +0.01   f2-f3 Ng8-f6 Bf1-e2 O-O Nb1-c3 d7-d6 O-O a7-a6 Qd1-e1 Bc8-d7 Kg1-h1 Qd8-e7 Qe1-g3 Kg8-h8
  14   03:32     78,795,428   685,433   +0.03   Nd4-f3 Bc5xe3 f2xe3 Ne5xf3+ Qd1xf3 Qd8-h4+ g2-g3 Qh4-f6 Qf3xf6 Ng8xf6 Nb1-c3 O-O Nc3-b5 c7-c6 Nb5-d6 Nf6-g4
  14   03:32     81,475,369   685,669   +0.11   Nd4-f5 Bc5xe3 Nf5xe3 Ng8-f6 Bf1-e2 O-O O-O d7-d6 Nb1-c3 Bc8-e6 f2-f4 Ne5-c6 Qd1-d2 Qd8-e7 Kg1-h1
  14   03:32     71,829,506   685,186   +0.13   Nb1-c3 Ng8-f6 Bf1-e2 d7-d6 O-O O-O h2-h3 a7-a6 Qd1-d2 Bc5-b4 Be3-g5 Bc8-d7 f2-f4 Ne5-c6
  14   03:32     91,711,569   684,869   +0.15   Nd4-c6 Ne5xc6 Be3xc5 d7-d6 Bc5-a3 Ng8-f6 Bf1-d3 O-O O-O Bc8-e6 Nb1-c3 Nc6-e5 Bd3-b5 Qd8-e7
  14   03:32     75,278,351   685,245   +0.18   Bf1-e2 Ng8-f6 O-O d7-d6 Nb1-c3 O-O h2-h3 Bc8-d7 f2-f4 Ne5-c6 Kg1-h2 Nc6xd4 Be3xd4 Bd7-e6 Qd1-d2 Bc5xd4 Qd2xd4
  14   03:32     89,353,657   684,812   +0.33   Nd4-e6 Bc5-b4+ c2-c3 f7xe6 c3xb4 Ng8-f6 Bf1-e2 O-O Nb1-c3 a7-a5 b4xa5 Ra8xa5 O-O Kg8-h8 f2-f4 Ne5-c6
  14   03:32     67,132,666   685,139   +0.69   f2-f4 Ne5-g6 Nb1-c3 d7-d6 Bf1-b5+ c7-c6 Bb5-a4 Ng8-e7 O-O O-O Kg1-h1 Bc8-d7 Ba4-b3 Qd8-b6 a2-a3
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Subject Author Date/Time
Reducing Strength Ted Wong Thu Mar 15, 2012 12:22 am
      Re: Reducing Strength Edmund Moshammer Thu Mar 15, 2012 2:43 am
            Re: Reducing Strength Ted Wong Thu Mar 15, 2012 6:21 am
                  Re: Reducing Strength Pawel Koziol Thu Mar 15, 2012 9:10 am
                        Re: Reducing Strength Ted Wong Thu Mar 15, 2012 10:04 am
      Re: Reducing Strength Ferdinand Mosca Thu Mar 15, 2012 10:34 am
      Re: Reducing Strength Robert Houdart Thu Mar 15, 2012 10:44 am
            Re: Reducing Strength Ed Schroder Thu Mar 15, 2012 12:17 pm
                  Re: Reducing Strength Mike Robinson Thu Mar 15, 2012 1:55 pm
      Re: Reducing Strength Robert Hyatt Thu Mar 15, 2012 2:02 pm
            Re: Reducing Strength Mike Robinson Thu Mar 15, 2012 2:40 pm
                  Re: Reducing Strength Ted Wong Thu Mar 15, 2012 4:35 pm
                  Re: Reducing Strength Edmund Moshammer Thu Mar 15, 2012 5:26 pm
            Re: Reducing Strength Jon Dart Sat Mar 17, 2012 2:53 pm
                  Re: Reducing Strength Robert Hyatt Sat Mar 17, 2012 4:07 pm
                        Re: Reducing Strength Pawel Koziol Sun Mar 25, 2012 7:36 pm
                              Re: Reducing Strength Ted Wong Mon Mar 26, 2012 12:47 am
      Re: Reducing Strength Ben-Hur Carlos Langoni Sat Mar 17, 2012 3:39 pm
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