The Shredder chess programs by Stefan Meyer-Kahlen provide a
game playing and analysis tool for everybody and are accepted as
one of the best chess programs of the world. Since 1996 Shredder has
won seventeen titles as World Computer Chess Champion which
makes Shredder the most successful chess program ever.
Credit: Stefan Meyer-Kahlen from Shredderchess.com. You can visit
their site to get Opening and Ending chess databases, for puzzle of the
day or weekly chess problems.