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