Yu Leong Wong (Hong Kong)  vs  Mona        June 25 - July 1, 2000

   1. c8:a6 a5-c7   2. g8-g6 h4-f2   3. e8:h5 h7-e7   4. d1-b3 a7-d7
   5. b1-b4 h6:f8   6. c1:a3 f8:b4   7. g1-g3 h2:h5   8. e1-c3 h3:f1
   9. a6-c6 a4-c4  10. g6-e6 f1-d3  11. g3-d6 e7-b7  12. e6-b6 a2-c2
  13. b8-a7 f2-c5  14. a7-a5 h5-e5  15. Resigns 0-1

 Yu Leong Wong played very quickly throughout, and this game took only
 one week to complete.  Despite the brisk pace, he played extremely well
 in a complicated middlegame.  As with all of the games against strong
 human players, we saw some new and interesting ideas to learn from.
 In particular, note the formation of the two Black "inner walls" along
 the third rank, separating the White groups.

      +-----------------+
    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:a6 a5-c7

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

 11    +63  a5-c7 d1-b3 h7-e7 g1-g3 h2-f2 b8-b5 h6:f8

 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 | 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 h4-f2

 11    +76  h7-e7 g1-g3 a3-d6 e8:h5 h2-f2 a6-b7 a7-c5
 11    +78  h4-f2 b8-b6 a7-d7 d8-e7 a2-d2 f8-c5 d7-d4

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

   3. e8:h5 h7-e7

  9   +153  h7-e7 d8-d6 h2:d6 g6-g4 h6:f8
 11   +124  h7-e7 g1-g3 a7-d7 g3:c7 a2-d2 f8-f5 h6:f8

      +-----------------+
    8 | . B . B . B . . |
    7 | W . W . W . . . |
    6 | B . . . . . B W |
    5 | . . . . . . . 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. d1-b3 a7-d7

 11   +120  a7-d7 c1:a3 h3-e3 b1-b4 a4-c6 a3:e7 a2-d2
 13    +72  a7-d7 b8-b5 a3-d6 f8:h6 a2-d2 h6:d6 h3-f5 a6-d3 a4-b4

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

   5. b1-b4 h6:f8

 11   +168  h6:f8 g1-g3 f8:b4 g3:c7 a2-d2 b8-b5 h3-e3
 13   +145  h6:f8 b8-b5 f8:b4 h5-g4 h3:f1 g6-e6 a2-d2 g4:d7 f1-f3

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

   6. c1:a3 f8:b4

 11   +190  f8:b4 b8-b5 h3:f1 a6-d3 h2-f4 g1-g3 f4-e3
 13   +168  f8:b4 b8-b5 h3:f1 a6-d3 h2-f4 e1-c3 a2-c2 b3-c4 c2-e2

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

   7. g1-g3 h2:h5

  9   +211  a2-d2 g3:c7 h3-e3 b8-b5 a4-c4
  9   +219  h2:h5 d8-f8 a2-c2 a3-b2 d7-b5
 11   +199  h2:h5 b8-b5 a2-c2 a3-e3  ...   ...   ... 

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

   8. e1-c3 h3:f1

 11   +182  h5-g4 a3-b2 a2-b1 a6:a4 b4-d6 b8-b4 d6:g3
 11   +189  h3-f5 b8-b5 a2-c2 a3-e3 c7-c4 e3-d2 a4:a6
 11   +190  b4-d4 c3-b4 e7:b4 a3-b2 d7-b5 a6-c6 a2-b1
 11   +223  h3:f1 b8-b5 f1-c4 b5-d5 h5-g4 a6:c4 g4:c4

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

   9. a6-c6 a4-c4

  9   +239  a4-c4 d8-f8 f1-d3 a3-b2 a2-b1
 11   +236  a4-c4 c3-b2 a2-b1 b3-a4 d7-d5 b8:b4 e7:b4

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

  10. g6-e6 f1-d3

 11   +207  a2-c2 a3-a4 e7-c5 a4:d7 f1-d3 c3-d4 c5-e5
 11   +230  f1-d3 g3-d6 f2-g3 c3-d4 h5-h4 d4:h4 e7-b7
 13   +217  f1-d3 g3-d6 e7-b7 b8-a7 f2-f3 d6-f4 h5-h4 c6:f3 b4:f4

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

  11. g3-d6 e7-b7

 11   +188  f2-g3 c3-d4 h5-h4 a3-b2 a2-a3 d8-f8 b4-c3
 11   +217  e7-b7 b8-a7 f2-f3 d6-f4 h5-h4 c6:f3 b4:f4
 13   +254  e7-b7 b8-a7 f2-f3 d6-f4 h5-h4 c6:f3 b4:f4 a7-b6 b7-e7

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

  12. e6-b6 a2-c2

 13   +401  h5-h6 b6-f6 b7:b3 b8-b5 h6-h5 b5-d5 c4-e4 d5-b5 d3:b5
 13   +443  a2-c2 b8-a7 f2-f3 d6-f4 b4-e4 d8-e7 c2-f5 c3-d4 c7-e5

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

  13. b8-a7 f2-c5

 13   +492  f2-f3 d6-f4 b4-e4 d8-e7 c7-e5 c3:e5 d7-e6 e5-c7 c2:c6
 13   +502  f2-c5 b6-e6 b4-d4 d6-f4 h5-h6 f4-d6 b7-b5 d8-e7 b5:b3

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

  14. a7-a5 h5-e5

 11  +2297  h5-e5 c3:e5 c4-e6 d8-c8 d3:d6 e5-d4 b4:d4 a5:c5 c2-d3 a3:d6 d4-e5
 12 +32000  h5-e5 c3:e5 c4-e6 d8-c8 d3:d6 e5-d4 b4:d4 a5:c5 c2-d3 a3:d6 d4-e5 b3:d3
 13 +32000  h5-e5 c3:e5 c4-e6 d8-c8 d3:d6 e5-d4 b4:d4 a5:c5 c2-d3 a3:d6 d4-e5 b3:d3

 The "mate in 12" (and suicide move at the end) is an artifact of the
 one-move lookahead.  Since there is no answer to the double threat of
 connection, all moves are considered to be equal, and it just plays
 the first move from the ordered list.  The actual mate is 13-ply away.

 If 14. a3-b2 it is still mate in 13-ply, for example:
 h5-g4 c3-e5 c5:e5 d8-c8 b4:d6 b3:d3 d7-d4 a7:d4 g4:d4 b6-b3 b7-d7 b2-b4 d7:d3

 If 14. b6-e6, there is no mate within 15-ply, but the position is
 very difficult to defend (Mona has never lost with a +500 advantage).

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

  15. Resigns 0-1