It's been a while since Dam 2.2 v.7 was released (1999!), but lately I've been working on a new 64-bit program named Moby Dam.

This is not a complete stand-alone program; it's just a draughts engine that must be controlled from a separate graphical user interface (GUI) using the DamExchange protocol. The use of DamExchange allows Moby Dam and the GUI to run on the same machine or on different machines, as desired.
It just so happens that Dam 2.2 is well-suited for such a use as a GUI controller:

Moby Dam writes a lot of information to a logfile. Conveniently, a little tool called WinTail can display and scroll the logfile in real-time. Or use 'tail -f' under Linux.

You operate the GUI to play against Moby Dam:

Features of Moby Dam:

• Open Source (GPL v3.0)
• Compiles and runs on Linux and Windows 64-bit systems
• The processor must support the POPCNT instruction
• Multi-core parallel search (since the 2023 version)
• Uses the 2-6 piece endgame databases, available here.

Initial release: mobydam-2015-07-05.zip. This is the version that participated in the 18th Computer Olympiad on July 4 and 5, 2015.

Second release: mobydam-2016-07-03.zip. This is the version that participated in the 19th Computer Olympiad on July 2 and 3, 2016 and the 20th Computer Olympiad on July 1 and 2, 2017.
Changes are:

• Support Visual Studio 2015
• Added DXP BACKREQ (take back move) support
• Fixed opponent's move count in the log
• Increased strength of play by adding bad move pruning a la Scan

Third release: mobydam-2019-05-19.zip. This is the version that participated in the Open Dutch Championship Computer Speed Draughts 2019.
Changes are:

• Made move generator faster when compiled with Visual Studio.
• Fixed killer moves by converting from position-based to from-to pair.
• Cleaned up function that writes PDN to file.

Fourth release: mobydam-2023-07-12.zip.
Changes are:

• Implemented multi-threaded search as Lazy SMP.
• Implemented pattern/region based evaluation, similar to what Scan, Kingsrow and DragonDraughts are doing.

The source files are also accessible as a Git repository at Rein Halbersma's github account.

For more details of Moby Dam you are welcome to view and join the discussion in the Moby Dam topic at the World Draughts Forum.

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