This web page lists the quickest mates I have been able to find playing the OS2 chess program.

The chess program which comes with OS2 is far from perfect. (A better OS2 chess program is the freeware UChess 1.17 ). Nevertheless I found it quite interesting to search for the quickest possible wins (mates) after each of the 20 possible first moves for white.

Rules: Use strongest setting ("advanced") and do not select a book opening. Find the quickest wins (mates) after each of the 20 possible first moves for white and as black. Variations in which OS2 chess does not obey the rules of chess are not eligible. My best results appear below.

         a3 - 12 moves                 a4 - 12 moves
         b3 - 11 moves                 b4 - 14 moves
         c3 - 11 moves                 c4 - 12 moves
         d3 - 12 moves                 d4 - 12 moves
         e3 - 11 moves                 e4 - 11 moves
         f3 - 13 moves                 f4 - 11 moves
         g3 - 12 moves                 g4 - 15 moves
         h3 - 12 moves                 h4 - 11 moves
        na3 - 12 moves                nc3 - 11 moves
        nf3 - 11 moves                nh3 - 12 moves
                      black - 11 moves