CheatCodes.com has all the official Checkmate PS2 cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Monday May 20, 2013 for Checkmate are shown below. We also have this game on PlayStation, PlayStation 2, and sometimes tricks from other game systems will also work on PlayStation 2.
At the title screen, press Left, Up(2), Right(3) to select a bonus character in versus mode. For a second bonus character, unlock the first bonus character, then press L1(3), R1(3) at the title screen.
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