Author: Erik Madsen

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Banks 53rd Amateur Series Division 6

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MadChess 1.4 participated in Graham Banks’ 53rd amateur tournament in division 6. 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 1 Donna 2.1 64-bit ** 1½ 1½ 1½ ½½ 01 ½1 ½½ 1½ ½1 11 ½0 11 ½1 11 11 11 11 26.0/34 2 Ares 1.005 64-bit 0½ ** ½½ ½0 1½ ½1 01 1½ 1½ ½½ 11 11 1½ 1½ 11 11 11 11 25.0/34 3 Carballo 1.2 0½ ½½ ** ½½ 01 ½½ ½½ ½½ 1½ ½1 11 ½1 10 01 11 1½ 1½ 11 22.0/34 4 Myrddin… Continue Reading

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MadChess 2.0 Beta Build 083 (Knight Outposts)

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I added knight outpost evaluation to MadChess 2.0 Beta. Knights on the 5th rank or beyond are awarded a bonus if they cannot be attacked by enemy pawns and are supported by their own pawn. This added 25 Elo to the playing strength of MadChess 2.0 Beta. MadChess 2.0 2287 : 1600 (+785,=327,-488), 59.3 % vs. : games ( +, =, -), (%) : Diff, SD, CFS (%) Glass 1.6 : 100 ( 14, 15, 71), 21.5 : -187, 10, 0.0 RomiChess P3L : 100 ( 18, 28, 54), 32.0 : -145, 14, 0.0 OliThink 5.3.2 : 100 ( 21,… Continue Reading

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Banks 52nd Amateur Series Division 7

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MadChess 1.4 participated in Graham Banks’ 52nd amateur tournament in division 7. 1 2 3 4 5 6 7 8 9 0 1 Gibbon 2.60a 64-bit **** 11½0 ½0½½ 1½½½ ½110 0½1½ 1½½1 1011 1½1½ 1½½1 23.0/36 2 Orion 0.2 64-bit 00½1 **** 0110 ½110 ½½00 ½0½1 1½11 1111 ½½1½ 11½0 21.5/36 3 Mango Paola Ajedrez 4.1 ½1½½ 1001 **** 0100 1011 ½001 ½½11 1010 10½1 111½ 21.0/36 4 Lozza 1.15 64-bit 0½½½ ½001 1011 **** ½10½ ½01½ ½00½ ½½1½ 1011 111½ 20.0/36 5 Absolute Zero 2.4.0.0 64-bit ½001 ½½11 0100 ½01½ **** 1½1½ 0½½1 01½0 100½ 111½ 19.0/36 6… Continue Reading

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MadChess 2.0 Beta Build 074 (Tune Reductions And Pruning)

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I tuned parameters related to search reductions and move pruning.  The {3, 7} in the code below means reduce the 3rd quiet move one ply, and reduce the 7th quiet move two plies. This added 20 Elo to the playing strength of MadChess 2.0 Beta. MadChess 2.0 2262 : 1600 (+738,=325,-537), 56.3 % vs. : games ( +, =, -), (%) : Diff, SD, CFS (%) Glass 1.6 : 100 ( 16, 24, 60), 28.0 : -186, 10, 0.0 RomiChess P3L : 100 ( 18, 18, 64), 27.0 : -171, 12, 0.0 OliThink 5.3.2 : 100 ( 16, 24, 60),… Continue Reading

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MadChess 2.0 Beta Build 069 (Bishop Pair)

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I added bishop pair evaluation to MadChess 2.0 Beta. The code awards a bonus for possessing two or more bishops, calibrated by game phase. This added 18 Elo to the playing strength of MadChess 2.0 Beta. MadChess 2.0 2242 : 1280 (+561,=259,-460), 53.9 % vs. : games ( +, =, -), (%) : Diff, SD, CFS (%) Glass 1.6 : 80 ( 12, 12, 56), 22.5 : -219, 16, 0.0 RomiChess P3L : 80 ( 8, 12, 60), 17.5 : -215, 18, 0.0 OliThink 5.3.2 : 80 ( 7, 10, 63), 15.0 : -202, 18, 0.0 Myrddin 0.87 : 80… Continue Reading