Dave Dyer (USA)  vs  Mona                         June 9-19, 2000

   1. c8-c6 h5-f7   2. g8-g6 h7-e7   3. e8-b5 h4-f2   4. b1-b4 h2-e2
   5. b8-c7 a2-d2   6. d8:a5 a7-d4   7. d1-b3 a3:c1   8. g1:c1 e7:b4
   9. c1-c4 f7:c4  10. c7:c4 h6-h4  11. g6-f7 a6:c6  12. c4:c6 a4-e4
  13. b5:e2 b4-f4  14. f7-d5 f4-g3  15. Resigns (mate next move) 0-1

 This was a tough game, with Mona having little or no advantage until
 a mistake allowed her piece on a6 to escape containment, with mate
 following quickly thereafter.

      +-----------------+
    8 | . B B B B B B . |
    7 | W . . . . . . W |
    6 | W . . . . . . W |
    5 | W . . . . . . W |
    4 | W . . . . . . W |
    3 | W . . . . . . W |
    2 | W . . . . . . W |
    1 | . B B B B B B . |
      +-----------------+
        a b c d e f g h

   1. c8-c6 h5-f7

 ply value  best  principle variation (last 4-ply deleted)

 11    +29  h5-f7 e1-g3 a7-d7 g1-g4 a2-c2 g4:d7 h7-e4

 A note on Mona's minimax scores:

 There is a significant odd-even effect, so odd-ply values are likely
 optimistic (at least 50 points too high, so +50 should be interpreted
 as an equal position).  A score of about +150 usually indicates a
 small advantage, and +300 a clear advantage.

 Mona indicates a mate threat with a +1000 bonus, so a score of +3150
 indicates a small positional advantage and a triple threat to connect.
 Only certain types of mate threats are detected statically, so there
 could be more in a given position.  Mona reserves 0 (zero) for a draw
 and +32000 for a win.

      +-----------------+
    8 | . B . B B B B . |
    7 | W . . . . W . W |
    6 | W . B . . . . W |
    5 | W . . . . . . . |
    4 | W . . . . . . W |
    3 | W . . . . . . W |
    2 | W . . . . . . W |
    1 | . B B B B B B . |
      +-----------------+
        a b c d e f g h

   2. g8-g6 h7-e7

 11    +66  h7-e7 e8-b5 h4-f2 c1-c3 h2-e2 e1-b4 a2-d2

      +-----------------+
    8 | . B . B B B . . |
    7 | W . . . W W . . |
    6 | W . B . . . B W |
    5 | W . . . . . . . |
    4 | W . . . . . . W |
    3 | W . . . . . . W |
    2 | W . . . . . . W |
    1 | . B B B B B B . |
      +-----------------+
        a b c d e f g h

   3. e8-b5 h4-f2

 11    +37  h4-f2 b1-b4 h2-e2 c1:a3 a2-d2 b8-c7 h3:f1

      +-----------------+
    8 | . B . B . B . . |
    7 | W . . . W W . . |
    6 | W . B . . . B W |
    5 | W B . . . . . . |
    4 | W . . . . . . . |
    3 | W . . . . . . W |
    2 | W . . . . W . W |
    1 | . B B B B B B . |
      +-----------------+
        a b c d e f g h

   4. b1-b4 h2-e2

 13     +2  h2-e2 c1:a3 a2-d2 a3:e7 a5-c7 e7-g5 h6:f8 g1-c1 f8-d6

      +-----------------+
    8 | . B . B . B . . |
    7 | W . . . W W . . |
    6 | W . B . . . B W |
    5 | W B . . . . . . |
    4 | W B . . . . . . |
    3 | W . . . . . . W |
    2 | W . . . W W . . |
    1 | . . B B B B B . |
      +-----------------+
        a b c d e f g h

   5. b8-c7 a2-d2

 11    +37  a2-d2 c1-c4 h6:f8 g6-d6 a7-d4 g1-g2 d4-e5
 13    +64  a2-d2 g1-g3 a3:c1 f1:h3 a7-c5 b5:e2 a4:c6 g6:c6 h6-e6

      +-----------------+
    8 | . . . B . B . . |
    7 | W . B . W W . . |
    6 | W . B . . . B W |
    5 | W B . . . . . . |
    4 | W B . . . . . . |
    3 | W . . . . . . W |
    2 | . . . W W W . . |
    1 | . . B B B B B . |
      +-----------------+
        a b c d e f g h

   6. d8:a5 a7-d4

 13    +11  a4-c2 c1:a3 h3:f1 b4-c4 h6-f4 g1-g3 a7-c5 c7:f4 d2:f4
 13    +63  a7-d4 c1-c4 h6:f8 g6-d6 d2:d6 f1:h3 d6-f4 b4-b6 f2:b6

      +-----------------+
    8 | . . . . . B . . |
    7 | . . B . W W . . |
    6 | W . B . . . B W |
    5 | B B . . . . . . |
    4 | W B . W . . . . |
    3 | W . . . . . . W |
    2 | . . . W W W . . |
    1 | . . B B B B B . |
      +-----------------+
        a b c d e f g h

   7. d1-b3 a3:c1

 11    +68  h3-e3 c1:a3 e3:b3 a3:e7 f7-f3 f8-c5 h6-f4
 11    +76  a3:c1 b4:e7 a4-c4 f8-d6 d4-c3 g1:c1 f7-f4
 13    +81  a3:c1 b4:e7 a4-c4 c7:f7 c4:f7 g1:c1 h6-e3 c1-b2 a6-b7

      +-----------------+
    8 | . . . . . B . . |
    7 | . . B . W W . . |
    6 | W . B . . . B W |
    5 | B B . . . . . . |
    4 | W B . W . . . . |
    3 | . B . . . . . W |
    2 | . . . W W W . . |
    1 | . . W . B B B . |
      +-----------------+
        a b c d e f g h

   8. g1:c1 e7:b4

 13    +43  h6-e3 b4:e7 e3:e7 a5:d2 h3:f1 c1-e3 d4:d2 e3:e7 f1:b5
 13    +65  e7:b4 f8-d6 b4:d6 a5:d2 a4-c4 c1-b2 h3-f3 b2:d4 f2:d4

      +-----------------+
    8 | . . . . . B . . |
    7 | . . B . . W . . |
    6 | W . B . . . B W |
    5 | B B . . . . . . |
    4 | W W . W . . . . |
    3 | . B . . . . . W |
    2 | . . . W W W . . |
    1 | . . B . B B . . |
      +-----------------+
        a b c d e f g h

   9. c1-c4 f7:c4

 11    +97  f7:c4 c7:c4 h6-h4 e1-c1 d2:a5 f8-d6 d4:d6
 13    +99  f7:c4 c7:c4 h6-h4 e1-c1 d2:a5 f1-d1 a6-a3 b5:e2 a5-c3

      +-----------------+
    8 | . . . . . B . . |
    7 | . . B . . . . . |
    6 | W . B . . . B W |
    5 | B B . . . . . . |
    4 | W W W W . . . . |
    3 | . B . . . . . W |
    2 | . . . W W W . . |
    1 | . . . . B B . . |
      +-----------------+
        a b c d e f g h

  10. c7:c4 h6-h4

 11    +99  h6-h4 e1-c1 d2:a5 f1-d1 a6-a3 b5:e2 a5-c3
 13    +84  h6-h4 e1-c1 d2:a5 f8-d6 a6-a3 f1-d1 f2-d2 d1:a4 h3-e3

      +-----------------+
    8 | . . . . . B . . |
    7 | . . . . . . . . |
    6 | W . B . . . B . |
    5 | B B . . . . . . |
    4 | W W B W . . . W |
    3 | . B . . . . . W |
    2 | . . . W W W . . |
    1 | . . . . B B . . |
      +-----------------+
        a b c d e f g h

  11. g6-f7 a6:c6

 11   +386  a6:c6 e1-c1 c6-d6 c1-c3 e2-e3 a5-c5 d6-d3
 13   +790  a6:c6 e1-c1 c6-d5 f8-f4 d4-c3 b5-b8 h3-e3 a5-b6 a4-b5

 If 11. e1-c1, Mona believes the position has nearly equal chances
 for both sides.

      +-----------------+
    8 | . . . . . B . . |
    7 | . . . . . B . . |
    6 | . . W . . . . . |
    5 | B B . . . . . . |
    4 | W W B W . . . W |
    3 | . B . . . . . W |
    2 | . . . W W W . . |
    1 | . . . . B B . . |
      +-----------------+
        a b c d e f g h

  12. c4:c6 a4-e4

  9  +3187  a4-e4 b5:e2 b4-f4 e1-g1 e4:e2
 11 +32000  a4-e4 b5:e2 b4-f4 e1-g1 e4:e2 f1:h3 h4-g5 f8:f4 g5-g3 g1:g3 e2-e3

 After being informed that Mona had proven a win, Dave Dyer consulted
 his program, which did not agree with the result (it played to a draw
 by repetition).  The remaining moves were played by his program.

      +-----------------+
    8 | . . . . . B . . |
    7 | . . . . . B . . |
    6 | . . B . . . . . |
    5 | B B . . . . . . |
    4 | . W . W W . . W |
    3 | . B . . . . . W |
    2 | . . . W W W . . |
    1 | . . . . B B . . |
      +-----------------+
        a b c d e f g h

  13. b5:e2 b4-f4

  9 +32000  b4-f4 e1-g1 e4:e2 f1:h3 h4-g5 f8:f4 g5-g3 g1:g3 e2-e3

      +-----------------+
    8 | . . . . . B . . |
    7 | . . . . . B . . |
    6 | . . B . . . . . |
    5 | B . . . . . . . |
    4 | . . . W W W . W |
    3 | . B . . . . . W |
    2 | . . . W B W . . |
    1 | . . . . B B . . |
      +-----------------+
        a b c d e f g h

  14. f7-d5 f4-g3

  3 +32000  f4-g3 e1:e4 h3-e3

      +-----------------+
    8 | . . . . . B . . |
    7 | . . . . . . . . |
    6 | . . B . . . . . |
    5 | B . . B . . . . |
    4 | . . . W W . . W |
    3 | . B . . . . W W |
    2 | . . . W B W . . |
    1 | . . . . B B . . |
      +-----------------+
        a b c d e f g h

  15. Resigns (mate next move) 0-1