Author: Erik Madsen

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Banks 74th Amateur Series Division 7

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MadChess 2.2 participated in Graham Banks’ 74th amateur tournament in division 7. Orio Jumb Dork Rook Fran Bets Lozz Neme Dros MadC Galj Axol 1. Orion 0.6 64-bit #### 1010 0==1 0110 ===1 0101 1==1 101= 111= =11= 1111 ===1 66% 29.0 (940.0, 598.0) 2. Jumbo 0.6.107 64-bit 0101 #### ==== 1=== 1==1 10=1 1101 0=1= 1101 1101 101= =1=1 65% 28.5 (942.0, 598.0) 3. Dorky 4.8 64-bit 1==0 ==== #### =110 =11= =11= =10= =101 00== 11== 1=0= 1111 61% 27.0 (948.0, 570.5) 4. RookieMonster 1.6.7 64-bit 1001 0=== =001 #### 0=10 =111 010= ==10 1=11 11== =1== 1110… Continue Reading

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Banks 73rd Amateur Series Division 7

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MadChess 2.2 participated in Graham Banks’ 73rd amateur tournament in division 7. Baga Donn Dork Orio Ghos MadC Bets Rook Dros Jumb Lozz Romi 1. Bagatur 1.7 64-bit #### =0== ==0= 1==0 ===1 =111 11=1 =10= ==1= 110= =111 1=1= 64% 28.0 (944.0, 583.8) 2. Donna 4.1 64-bit =1== #### =101 =11= 1=00 1=1= 1110 ===1 1==0 ==== 1110 101= 62% 27.5 (946.0, 592.0) 3. Dorky 4.8 64-bit ==1= =010 #### 1=== 111= 1=00 10== =011 1110 0=11 ===1 =0=1 59% 26.0 (952.0, 561.3) 4. Orion 0.5 64-bit 0==1 =00= 0=== #### 0100 1==1 =001 =1=1 1011 1111 ==1= =1=1… Continue Reading

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Banks 72nd Amateur Series Division 7

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MadChess 2.2 participated in Graham Banks’ 72nd amateur tournament in division 7. Asym Topp Dork Ghos Jumb MadC Rook Bets Baga Lozz Dros Neme 1. Asymptote 0.4 64-bit #### 1=00 =1=1 101= 11=1 1=11 0=== 0110 11== 0=1= 111= =111 67% 29.5 (938.0, 616.3) 2. Topple 0.3.3 64-bit 0=11 #### ==10 0=11 1=01 0111 ==0= 0111 0011 ==1= 11=1 1111 66% 29.0 (940.0, 601.8) 3. Dorky 4.8 64-bit =0=0 ==01 #### 1011 000= 111= 1111 1110 0111 0110 1001 ==11 61% 27.0 (948.0, 562.5) 4. Ghost 3.1 64-bit 010= 1=00 0100 #### 1=01 0101 010= 1101 =110 1==1 1001 11=1… Continue Reading

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MadChess 3.0 Beta Build 103 (Passed Pawns)

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I added passed pawn evaluation to MadChess 3.0 Beta. The passed pawn evaluation code scores the following features: Passed Pawns Free Passed Pawns (no pieces blocking promotion path) King Escorted Passed Pawns Unstoppable Passed Pawns (Rule of the Square) Middlegame Passed Pawns: 000 000 003 008 015 024 034 000 Endgame Passed Pawns: 000 004 018 042 075 118 170 000 Endgame Free Passed Pawns: 000 008 034 077 138 216 311 000 Endgame King Escorted Passed Pawn: 11 Unstoppable Passed Pawn: 775   This code improved the engine’s understanding of threats created by pushing passed pawns. It increased the… Continue Reading

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MadChess 3.0 Beta Build 093 (Staged Move Generation)

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I increased the speed at which MadChess 3.0 Beta examines nodes by implementing staged move generation. Previously, in the main search, the chess engine would generate all pseudo-legal moves, sort them by move priority, then iterate through them: testing move legality (does move expose own king to check) and playing the legal moves. This is wasteful if a beta cutoff occurs early in the move list. Usually a capture is responsible for a beta cutoff, so time is wasted generating non-captures. Now the chess engine generates moves in stages. I could have implemented more stages (QueenCaptures, RookCaptures, BishopKnightCaptures, etc) but… Continue Reading