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| computer_chess:engines:myrddin:index 2024/12/14 16:56 | computer_chess:engines:myrddin:index 2025/04/22 20:56 current | ||
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| First of all, thanks very much to Ron Murawski for making this site available and hosting Myrddin's history here! =) | First of all, thanks very much to Ron Murawski for making this site available and hosting Myrddin's history here! =) | ||
| - | Myrddin 0.92 supports SMP via processes (up to 16 instances) and is about 75-100 ELO stronger than v0.91 at 1 CPU and a further 70 ELO stronger at 4 CPUs. This version has not been formally tested above 4 CPUs so it is unknown how well it will scale above 4 CPUs. | + | Myrddin 0.93 supports SMP via processes (up to 32 instances) and is about 50 ELO stronger than v0.92 at 1 CPU. This version has not been formally tested above 4 CPUs so it is unknown how well it will scale above 4 CPUs. |
| ==== Download ==== | ==== Download ==== | ||
| - | Executable Package - [[https://www.dropbox.com/scl/fi/fpbbdfrsn2bc2dqa8gsrv/Myrddin-091.rar?dl=0 | Myrddin 0.91]] (released 10/20/24, CCRL rating estimated at 2975 at 1 CPU and 3055 at 4 CPUs)\\ | + | Executable Package - [[https://github.com/JVMerlino/Myrddin/releases/tag/Myrddin093 | Myrddin 0.93]] (released 4/18/25, CCRL rating estimated at 3150)\\ |
| Source Code - [[https://github.com/JVMerlino/Myrddin | Myrddin Source]] | Source Code - [[https://github.com/JVMerlino/Myrddin | Myrddin Source]] | ||
| == Old versions == | == Old versions == | ||
| - | [[https://www.dropbox.com/s/z2fkfkyxigohhp7/Myrddin%20090.rar?dl=0 | Myrddin 0.90]] (released 6/9/23, CCRL rating 2627 at 1 CPU and estimated at 2710 at 4 CPUs)\\ | + | [[https://github.com/JVMerlino/Myrddin/releases/tag/Myrddin092 | Myrddin 0.92]] (released 12/7/24, CCRL rating 3095\\ |
| + | [[https://github.com/JVMerlino/Myrddin/releases/download/Myrddin091/Myrddin.091.rar | Myrddin 0.91]] (released 10/20/24, CCRL rating 2997 at 1 CPU)\\ | ||
| + | [[https://www.dropbox.com/s/z2fkfkyxigohhp7/Myrddin%20090.rar?dl=0 | Myrddin 0.90]] (released 6/9/23, CCRL rating 2627 at 1 CPU)\\ | ||
| [[https://www.dropbox.com/s/1ksfgbrtnpahg3o/Myrddin%20089.rar?dl=0 | Myrddin 0.89]] (released 6/3/22, CCRL rating of 2587 at 1 CPU)\\ | [[https://www.dropbox.com/s/1ksfgbrtnpahg3o/Myrddin%20089.rar?dl=0 | Myrddin 0.89]] (released 6/3/22, CCRL rating of 2587 at 1 CPU)\\ | ||
| - | [[https://www.dropbox.com/s/v3amg3x4kkpjwqk/Myrddin%20088.rar?dl=0 | Myrddin 0.88]] (released 7/18/21, CCRL rating of 2545 at 1 CPU and 2621 at 4 CPUs)\\ | + | [[https://www.dropbox.com/s/v3amg3x4kkpjwqk/Myrddin%20088.rar?dl=0 | Myrddin 0.88]] (released 7/18/21, CCRL rating of 2545 at 1 CPU)\\ |
| {{myrddin087.rar | Myrddin 0.87}} (released 1/25/15, CCRL rating of 2365 at 1 CPU and 2461 at 4 CPUs)\\ | {{myrddin087.rar | Myrddin 0.87}} (released 1/25/15, CCRL rating of 2365 at 1 CPU and 2461 at 4 CPUs)\\ | ||
| {{myrddin086-ja.zip | Myrddin 0.86}} (released 12/21/12, CCRL rating of 2328)\\ | {{myrddin086-ja.zip | Myrddin 0.86}} (released 12/21/12, CCRL rating of 2328)\\ | ||
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| ==== Release Notes ==== | ==== Release Notes ==== | ||
| - | Myrddin 0.91 -- 10/20/24 | + | Myrddin 0.92 -- 12/7/24 |
| Myrddin is a winboard-compliant chess engine to a reasonable degree. It supports protover 1 primarily to support the Chessmaster interface, and also protover 2. | Myrddin is a winboard-compliant chess engine to a reasonable degree. It supports protover 1 primarily to support the Chessmaster interface, and also protover 2. | ||
| - | The 64-bit version of Myrddin should play approximately 2975 ELO against chess engines at 1 CPU (using CCRL rating), and probably 100 points higher against humans. This is an improvement of about 300-350 points compared to the previous release. Myrddin should play about 80 points stronger at 4 CPU. | + | The 64-bit version of Myrddin should play approximately 3075 ELO against chess engines at 1 CPU (using CCRL rating), and probably 100 points higher against humans. This is an improvement of 75-100 points compared to the previous release. Myrddin should play about 70 points stronger at 4 CPU. |
| The following winboard commands are supported: | The following winboard commands are supported: | ||
| Line 48: | Line 50: | ||
| * st | * st | ||
| * hard/easy | * hard/easy | ||
| + | * memory | ||
| * cores | * cores | ||
| * result | * result | ||
| Line 131: | Line 134: | ||
| ====Version/Change List==== | ====Version/Change List==== | ||
| + | |||
| + | == Version 0.93 (4/18/25) == | ||
| + | -- Now using IIR instead of IID\\ | ||
| + | -- Minor adjustments to LMR conditions\\ | ||
| + | -- Now supporting the xboard "memory" command (requested by Martin Sedlak)\\ | ||
| + | -- Increased the maximum number of SMP processes to 32 (requested by Lars Hallerstrom)\\ | ||
| + | -- Fixed a bug in pondering introduced in v0.90. Myrddin would restart thinking at depth 1 even if the expected ponder move was made by the opponent.\\ | ||
| + | -- Fixed a rare bug that could cause Myrddin to crash when using logfiles\\ | ||
| + | -- Found a bug that caused the Eval hash size to be 2MB instead of 32MB.\\ | ||
| + | -- Default Transposition hash size is now 256MB\\ | ||
| + | |||
| + | == Version 0.92 (12/7/24) == | ||
| + | -- Now doing incremental updates to the NN accumulator during make/unmake move\\ | ||
| + | -- Now compiling with clang (within MSVC IDE)\\ | ||
| + | -- Restored David Carteau's recommended eval multiplier - scores will be about 2x higher than before\\ | ||
| + | -- Now clearing Killer move scores with every depth\\ | ||
| + | -- Fixed potential instability/crash due to the move stack possibly becoming greater than MAX_DEPTH\\ | ||
| + | -- Minor optimizations to PVS implementation and cutoff ordering\\ | ||
| == Version 0.91 (10/20/24) == | == Version 0.91 (10/20/24) == | ||
