In spring/summer 1998 David Paulowich from Canada played 2 e-mail games
against Dabbaba (programmed by Jens Bęk Nielsen, Denmark).

David Paulowich has a canadian rating of 1850.

Dabbaba was allowed up to an hour pr. move on a Pentium II 233 Mhz.

A chess variant called chancellor chess was played.
The queen is the chancellor and it moves like a rook+knight.

Here are the games.
(a positive score means Dabbaba thinks white has the best position)

Game 1.
White: David Paulowich

   whites           seconds   nodes pr.   Dabbabas   score     depth 
   move             used      second      move              (next move)
----------------------------------------------------------------------
1.   f2-f4           2770      17461        d7-d5      24        9,1
2.  Ng1-f3           1250      18574       Ng8-f6     -36        8,1
3.   e2-e3           2063      17682       Bc8-g4     -56        8,1
4.  Bf1-e2           2845      17233        e7-e6     -56        8,1
5.   b2-b3           1571      17258       Nb8-c6      -8        7,1 
6.  Bc1-b2           2732      17373       Bf8-c5       7        7,1
7.  Bb2xf6           2648      17237        g7xf6    -101        7,1
8.   d2-d4           1845      16695       Nc6-b4      19        7,1
A little surprise.
In this variant c2/c7 is NOT covered by the queen.
9.  Nb1-a3           2990      17054       Bg4xf3     -19        8,1
10. Be2xf3           1401      19450       Bc5-e7      10        8,1
11.  0-0             1178      19270        c7-c5      13        8,1
12.  c2-c3           3472      17437       Nb4-c6      76        8,29
From this move Dabbaba started to use hashtables in a simple manner.
From move 18 the small hashtables worked complete.
13. Na3-c2           3278      18335        c5xd4      62        8,3
14.  e3xd4           1788      18259         0-0       61        8,1
15. Qd1-f2           1612      18615       Qd8-d6      52        8,1
16. Nc2-e3           3371      17270        f6-f5      24        7,11
17. Rf1-d1           2163      18394       Be7-h4      60        7,1
Here is some information from our e-mails:
"From this move Dabbaba plays with a little hashtable.
A little experiment with 17.-,Be7-h4 shows, that Dabbaba is 3 times 
faster when searching to a depth of 6-7 ply. 
Or, to put it another less sensational way, it can now search 6.5 ply 
in the same time it took for a 6 ply search before.
By the way, because of a few other changes, Dabbaba would have played 
-,Qe8 at depth 6 and -,Rac8 at depth 7."
18. Qf2-h3           1829      19038       Bh4-d8      65        8,1
19. Ke1-f1           3296      16562       Bd8-a5      20        7,22
It is obvious that Dabbaba cannot find a plan...
20. Rd1-d3           3327      18621       Qd6-b5      12        7,9
Dabbaba now expects 21.Ne3-c2 (if 21.-,Ba5xc3? 22.Bf3-e2! wins).
21.  c3-c4           3169      18996        d5xc4      49        8,1
22. Bf3xc6           2541      17153        b7xc6      37        9,1
23. Ne3xc4           3253      19451       Ba5-d8     103        8,1
Here 23.-,f6 were probably better.
24. Qh3-h6+          1653      18401       Kg8-g7     433        9,1
25. Qh6-h5+          1207      18927       Kg7-g8     211        8,1
26. Qh5-h6+          1653      18401       Kg8-g7     433        9,1
27. Rd3-h3           3100      18230       Rf8-h8     366        9,1
28. Nc4-e5!          1247      16440       Qb5-c7     353        7,1
29. Ne5xf7!          1856      17831       Bd8-h4     389        8,1
If 29.-,Qxf7 30.Qxe6+,Kg8 31.Rg3+ etc.
If 29.-,Re8 30.Rg3+,Kf8 31.Qg8+,Kxf7 32.Rg7+ mate.
30. Rh3xh4           1394      19120       Qc7-d5     722        7,2
Very nice finish by white. 
If 30.-,Qxf7 31.Qxe6+,Kg8 32.Rh5!,h6 33.Qg6+,Qg7 34.Qf6+ mate! 
Dabbaba resigns. 



Game 2.
Black: David Paulowich

Here black proposed to play the sicilian opening, so Dabbabas first
move was not calculated by itself.

                     --------- information on Dabbabas move --------
   Dabbabas  blacks  score  seconds  depth       Dabbabas expected 
   move      move           used    (next move)  line
--------------------------------------------------------------------
1.   e2-e4   c7-c5     -    -       -            
2.  Nb1-c3   e7-e6    68    3584    8,20         b8c6 c3b5 d8e6 d1e3
3.  Ng1-f3  Nb8-c6?   63    3330    8,15         d7d5 f1b5 b8c6
Despite the warning in the first game, black forgets that c7 is a 
weak spot. And in this position it is much worse.
It is not always easy to be a human...
4.  Nc3-b5  Ra8-b8   112    3281    8,21         a8b8 b5c7 e8e7
5.   d2-d4   d7-d5?  128    3534    8,8          c5d4 c1f4 f8b4
6.  Bc1-f4   d5xe4   364    3299    7,18         c5d4 e4d5 e6d5
7.  Bf4xb8  Nc6xb8   217    1587    7,1          c6b8
8.  Nf3-g5   a7-a6   224    3303    8,14         c5d4 b5a7 d4d3
9.  Nb5-c7+ Ke8-e7   331    3342    8,14         e8e7 d4c5 d8d1
10.  d4xc5  Ng8-h6   354    1569    8,1          d8d1 a1d1 g8f6
11. Ng5xe4  Qd8-c6   428    1935    8,1          d8c6 c7a8 f7f5
12. Nc7-a8   f7-f5   374    1643    8,1          f7f5 e4d6 c6c5
13. Ne4-d6  Qc6xc5   373    2654    8,1          c6c5 d1d2 c8d7
Black now threats mate on c2.
14. Qd1-d2  Nb8-d7?  358    2606    8,1          h6f7 d6f7 e7f7
15. 0-0-0    b7-b5?  509    3296    7,31         d7b8 d2c4
Black tries very hard to capture the knight on a8. It is his 
only chance to turn the game, but he completely ignores
whites threats.
16. Nd6xc8+ Qc5xc8?  905    3173    8,1          e7f6 d2d7
Here Dabbaba in 0,16 second announced mate in 3 with
17. Qd2xd7+ Ke7-e8
18. Na8-c7+ Qc8xc7
19. Qd7xc7+ mate.

Nodes pr. second in this games was between 15329 (move 2) and 
17971 (move 8).
Nodes pr. cut-off was ca. 4 for all the moves.

